Merge branch 'master' of https://github.com/JonCook/tutorials

persistence-modules/spring-data-jpa/README.md

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+=========
+
+## Spring Data JPA Example Project
+
+### Relevant Articles: 
+- [Spring JPA – Multiple Databases](http://www.baeldung.com/spring-data-jpa-multiple-databases)
+- [Spring Data JPA – Adding a Method in All Repositories](http://www.baeldung.com/spring-data-jpa-method-in-all-repositories)
+- [An Advanced Tagging Implementation with JPA](http://www.baeldung.com/jpa-tagging-advanced)
+- [Spring Data Annotations](http://www.baeldung.com/spring-data-annotations)
+- [Spring Data Java 8 Support](http://www.baeldung.com/spring-data-java-8)
+- [A Simple Tagging Implementation with JPA](http://www.baeldung.com/jpa-tagging)
+- [Spring Data Composable Repositories](https://www.baeldung.com/spring-data-composable-repositories)
+- [Query Entities by Dates and Times with Spring Data JPA](https://www.baeldung.com/spring-data-jpa-query-by-date)
+- [DDD Aggregates and @DomainEvents](https://www.baeldung.com/spring-data-ddd)
+- [Spring Data – CrudRepository save() Method](https://www.baeldung.com/spring-data-crud-repository-save)
+- [Limiting Query Results with JPA and Spring Data JPA](https://www.baeldung.com/jpa-limit-query-results)
+- [Sorting Query Results with Spring Data](https://www.baeldung.com/spring-data-sorting)
+- [INSERT Statement in JPA](https://www.baeldung.com/jpa-insert)
+- [Pagination and Sorting using Spring Data JPA](https://www.baeldung.com/spring-data-jpa-pagination-sorting)
+- [Spring Data JPA Query by Example](https://www.baeldung.com/spring-data-query-by-example)
+- [DB Integration Tests with Spring Boot and Testcontainers](https://www.baeldung.com/spring-boot-testcontainers-integration-test)
+- [Spring Data JPA @Modifying Annotation](https://www.baeldung.com/spring-data-jpa-modifying-annotation)
+- [Spring Data JPA Batch Inserts](https://www.baeldung.com/spring-data-jpa-batch-inserts)
+
+### Eclipse Config 
+After importing the project into Eclipse, you may see the following error:  
+"No persistence xml file found in project"
+
+This can be ignored: 
+- Project -> Properties -> Java Persistance -> JPA -> Error/Warnings -> Select Ignore on "No persistence xml file found in project"
+Or: 
+- Eclipse -> Preferences - Validation - disable the "Build" execution of the JPA Validator 
+

persistence-modules/spring-data-jpa/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+	<groupId>com.baeldung</groupId>
+    <artifactId>spring-data-jpa</artifactId>
+	<name>spring-data-jpa</name>
+	
+    <parent>
+        <artifactId>parent-boot-2</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-boot-2</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.hibernate</groupId>
+            <artifactId>hibernate-ehcache</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.hibernate</groupId>
+            <artifactId>hibernate-envers</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+        </dependency>
+
+        <!-- Test containers only dependencies -->
+        <dependency>
+            <groupId>org.testcontainers</groupId>
+            <artifactId>postgresql</artifactId>
+            <version>${testcontainers.postgresql.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.postgresql</groupId>
+            <artifactId>postgresql</artifactId>
+            <version>${postgresql.version}</version>
+        </dependency>
+        <!-- Test containers only dependencies -->
+
+        <dependency>
+            <groupId>org.springframework.security</groupId>
+            <artifactId>spring-security-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+        <groupId>org.springframework.boot</groupId>
+           <artifactId>spring-boot-starter-test</artifactId>
+           <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
+        
+        <!-- JUnit Jupiter dependencies -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <!-- JUnit platform launcher -->
+        <!-- To be able to run tests from IDE directly -->
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-launcher</artifactId>
+            <version>${junit-platform.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+    
+    <properties>
+    	<start-class>com.baeldung.boot.Application</start-class>
+    	<testcontainers.postgresql.version>1.10.6</testcontainers.postgresql.version>
+    	<postgresql.version>42.2.5</postgresql.version>
+    	<guava.version>21.0</guava.version>
+    </properties>
+
+</project>

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/Application.java

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+package com.baeldung.boot;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+
+import com.baeldung.boot.daos.impl.ExtendedRepositoryImpl;
+import com.baeldung.multipledb.MultipleDbApplication;
+
+@SpringBootApplication
+@EnableJpaRepositories(repositoryBaseClass = ExtendedRepositoryImpl.class)
+public class Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/config/PersistenceConfiguration.java

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+package com.baeldung.boot.config;
+
+import com.baeldung.boot.services.IBarService;
+import com.baeldung.boot.services.impl.BarSpringDataJpaService;
+import org.springframework.context.annotation.*;
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+@Configuration
+@Profile("!tc")
+@EnableTransactionManagement
+@EnableJpaAuditing
+public class PersistenceConfiguration {
+
+    @Bean
+    public IBarService barSpringDataJpaService() {
+        return new BarSpringDataJpaService();
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/ArticleRepository.java

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+package com.baeldung.boot.daos;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+import com.baeldung.boot.domain.Article;
+
+import java.util.Date;
+import java.util.List;
+
+public interface ArticleRepository extends JpaRepository<Article, Integer> {
+
+    List<Article> findAllByPublicationDate(Date publicationDate);
+
+    List<Article> findAllByPublicationTimeBetween(Date publicationTimeStart,
+                                                  Date publicationTimeEnd);
+
+    @Query("select a from Article a where a.creationDateTime <= :creationDateTime")
+    List<Article> findAllWithCreationDateTimeBefore(
+      @Param("creationDateTime") Date creationDateTime);
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/CustomItemRepository.java

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+package com.baeldung.boot.daos;
+
+import org.springframework.stereotype.Repository;
+
+import com.baeldung.boot.domain.Item;
+
+@Repository
+public interface CustomItemRepository {
+
+    void deleteCustom(Item entity);
+
+    Item findItemById(Long id);
+
+    void findThenDelete(Long id);
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/CustomItemTypeRepository.java

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+package com.baeldung.boot.daos;
+
+import org.springframework.stereotype.Repository;
+
+import com.baeldung.boot.domain.ItemType;
+
+@Repository
+public interface CustomItemTypeRepository {
+
+    void deleteCustom(ItemType entity);
+
+    void findThenDelete(Long id);
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/CustomerRepository.java

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+package com.baeldung.boot.daos;
+
+import org.springframework.data.repository.CrudRepository;
+
+import com.baeldung.boot.domain.Customer;
+
+/**
+ * JPA CrudRepository interface
+ * 
+ * @author ysharma2512
+ *
+ */
+public interface CustomerRepository extends CrudRepository<Customer, Long>{
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/ExtendedRepository.java

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+package com.baeldung.boot.daos;
+
+import java.io.Serializable;
+import java.util.List;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.repository.NoRepositoryBean;
+
+@NoRepositoryBean
+public interface ExtendedRepository<T, ID extends Serializable> extends JpaRepository<T, ID> {
+
+    List<T> findByAttributeContainsText(String attributeName, String text);
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/ExtendedStudentRepository.java

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+package com.baeldung.boot.daos;
+
+import com.baeldung.boot.domain.Student;
+
+public interface ExtendedStudentRepository extends ExtendedRepository<Student, Long> {
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/IBarCrudRepository.java

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+package com.baeldung.boot.daos;
+
+import org.springframework.data.repository.CrudRepository;
+
+import com.baeldung.boot.domain.Bar;
+
+import java.io.Serializable;
+
+public interface IBarCrudRepository extends CrudRepository<Bar, Serializable> {
+    //
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/IFooDao.java

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+package com.baeldung.boot.daos;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+import com.baeldung.boot.domain.Foo;
+
+public interface IFooDao extends JpaRepository<Foo, Long> {
+
+    @Query("SELECT f FROM Foo f WHERE LOWER(f.name) = LOWER(:name)")
+    Foo retrieveByName(@Param("name") String name);
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/InventoryRepository.java

@@ -0,0 +1,8 @@
+package com.baeldung.boot.daos;
+
+import org.springframework.data.repository.CrudRepository;
+
+import com.baeldung.boot.domain.MerchandiseEntity;
+
+public interface InventoryRepository extends CrudRepository<MerchandiseEntity, Long> {
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/ItemTypeRepository.java

@@ -0,0 +1,10 @@
+package com.baeldung.boot.daos;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import com.baeldung.boot.domain.ItemType;
+
+@Repository
+public interface ItemTypeRepository extends JpaRepository<ItemType, Long>, CustomItemTypeRepository, CustomItemRepository {
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/LocationRepository.java

@@ -0,0 +1,10 @@
+package com.baeldung.boot.daos;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import com.baeldung.boot.domain.Location;
+
+@Repository
+public interface LocationRepository extends JpaRepository<Location, Long> {
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/ReadOnlyLocationRepository.java

@@ -0,0 +1,15 @@
+package com.baeldung.boot.daos;
+
+import java.util.Optional;
+
+import org.springframework.data.repository.Repository;
+
+import com.baeldung.boot.domain.Location;
+
+@org.springframework.stereotype.Repository
+public interface ReadOnlyLocationRepository extends Repository<Location, Long> {
+
+    Optional<Location> findById(Long id);
+
+    Location save(Location location);
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/StoreRepository.java

@@ -0,0 +1,13 @@
+package com.baeldung.boot.daos;
+
+import java.util.List;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import com.baeldung.boot.domain.Store;
+
+@Repository
+public interface StoreRepository extends JpaRepository<Store, Long> {
+    List<Store> findStoreByLocationId(Long locationId);
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/impl/CustomItemRepositoryImpl.java

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+package com.baeldung.boot.daos.impl;
+
+import javax.persistence.EntityManager;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Repository;
+
+import com.baeldung.boot.daos.CustomItemRepository;
+import com.baeldung.boot.domain.Item;
+
+@Repository
+public class CustomItemRepositoryImpl implements CustomItemRepository {
+
+    @Autowired
+    private EntityManager entityManager;
+
+    @Override
+    public void deleteCustom(Item item) {
+        entityManager.remove(item);
+    }
+
+    @Override
+    public Item findItemById(Long id) {
+        return entityManager.find(Item.class, id);
+    }
+
+    @Override
+    public void findThenDelete(Long id) {
+        final Item item = entityManager.find(Item.class, id);
+        entityManager.remove(item);
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/impl/CustomItemTypeRepositoryImpl.java

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+package com.baeldung.boot.daos.impl;
+
+import javax.persistence.EntityManager;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Repository;
+
+import com.baeldung.boot.daos.CustomItemTypeRepository;
+import com.baeldung.boot.domain.ItemType;
+
+@Repository
+public class CustomItemTypeRepositoryImpl implements CustomItemTypeRepository {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(CustomItemTypeRepositoryImpl.class);
+
+    @Autowired
+    private EntityManager entityManager;
+
+    @Override
+    public void deleteCustom(ItemType itemType) {
+        entityManager.remove(itemType);
+    }
+
+    @Override
+    public void findThenDelete(Long id) {
+        ItemType itemTypeToDelete = entityManager.find(ItemType.class, id);
+        entityManager.remove(itemTypeToDelete);
+    }
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/impl/ExtendedRepositoryImpl.java

@@ -0,0 +1,37 @@
+package com.baeldung.boot.daos.impl;
+
+import java.io.Serializable;
+import java.util.List;
+
+import javax.persistence.EntityManager;
+import javax.persistence.TypedQuery;
+import javax.persistence.criteria.CriteriaBuilder;
+import javax.persistence.criteria.CriteriaQuery;
+import javax.persistence.criteria.Root;
+import javax.transaction.Transactional;
+
+import org.springframework.data.jpa.repository.support.JpaEntityInformation;
+import org.springframework.data.jpa.repository.support.SimpleJpaRepository;
+
+import com.baeldung.boot.daos.ExtendedRepository;
+
+public class ExtendedRepositoryImpl<T, ID extends Serializable> extends SimpleJpaRepository<T, ID> implements ExtendedRepository<T, ID> {
+
+    private EntityManager entityManager;
+
+    public ExtendedRepositoryImpl(JpaEntityInformation<T, ?> entityInformation, EntityManager entityManager) {
+        super(entityInformation, entityManager);
+        this.entityManager = entityManager;
+    }
+
+    @Transactional
+    public List<T> findByAttributeContainsText(String attributeName, String text) {
+        CriteriaBuilder builder = entityManager.getCriteriaBuilder();
+        CriteriaQuery<T> query = builder.createQuery(getDomainClass());
+        Root<T> root = query.from(getDomainClass());
+        query.select(root).where(builder.like(root.<String> get(attributeName), "%" + text + "%"));
+        TypedQuery<T> q = entityManager.createQuery(query);
+        return q.getResultList();
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/impl/PersonInsertRepository.java

@@ -0,0 +1,31 @@
+package com.baeldung.boot.daos.impl;
+
+import org.springframework.stereotype.Repository;
+
+import com.baeldung.boot.domain.Person;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import javax.transaction.Transactional;
+
+@Repository
+public class PersonInsertRepository {
+
+    @PersistenceContext
+    private EntityManager entityManager;
+
+    @Transactional
+    public void insertWithQuery(Person person) {
+        entityManager.createNativeQuery("INSERT INTO person (id, first_name, last_name) VALUES (?,?,?)")
+          .setParameter(1, person.getId())
+          .setParameter(2, person.getFirstName())
+          .setParameter(3, person.getLastName())
+          .executeUpdate();
+    }
+
+    @Transactional
+    public void insertWithEntityManager(Person person) {
+        this.entityManager.persist(person);
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/user/PossessionRepository.java

@@ -0,0 +1,9 @@
+package com.baeldung.boot.daos.user;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.baeldung.boot.domain.Possession;
+
+public interface PossessionRepository extends JpaRepository<Possession, Long> {
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/user/UserRepository.java

@@ -0,0 +1,99 @@
+package com.baeldung.boot.daos.user;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+import com.baeldung.boot.domain.User;
+
+import java.time.LocalDate;
+import java.util.Collection;
+import java.util.List;
+import java.util.stream.Stream;
+
+public interface UserRepository extends JpaRepository<User, Integer> , UserRepositoryCustom{
+
+    Stream<User> findAllByName(String name);
+
+    @Query("SELECT u FROM User u WHERE u.status = 1")
+    Collection<User> findAllActiveUsers();
+    
+    @Query("select u from User u where u.email like '%@gmail.com'")
+    List<User> findUsersWithGmailAddress();
+
+    @Query(value = "SELECT * FROM Users u WHERE u.status = 1", nativeQuery = true)
+    Collection<User> findAllActiveUsersNative();
+
+    @Query("SELECT u FROM User u WHERE u.status = ?1")
+    User findUserByStatus(Integer status);
+
+    @Query(value = "SELECT * FROM Users u WHERE u.status = ?1", nativeQuery = true)
+    User findUserByStatusNative(Integer status);
+
+    @Query("SELECT u FROM User u WHERE u.status = ?1 and u.name = ?2")
+    User findUserByStatusAndName(Integer status, String name);
+
+    @Query("SELECT u FROM User u WHERE u.status = :status and u.name = :name")
+    User findUserByStatusAndNameNamedParams(@Param("status") Integer status, @Param("name") String name);
+
+    @Query(value = "SELECT * FROM Users u WHERE u.status = :status AND u.name = :name", nativeQuery = true)
+    User findUserByStatusAndNameNamedParamsNative(@Param("status") Integer status, @Param("name") String name);
+
+    @Query("SELECT u FROM User u WHERE u.status = :status and u.name = :name")
+    User findUserByUserStatusAndUserName(@Param("status") Integer userStatus, @Param("name") String userName);
+
+    @Query("SELECT u FROM User u WHERE u.name like ?1%")
+    User findUserByNameLike(String name);
+
+    @Query("SELECT u FROM User u WHERE u.name like :name%")
+    User findUserByNameLikeNamedParam(@Param("name") String name);
+
+    @Query(value = "SELECT * FROM users u WHERE u.name LIKE ?1%", nativeQuery = true)
+    User findUserByNameLikeNative(String name);
+
+    @Query(value = "SELECT u FROM User u")
+    List<User> findAllUsers(Sort sort);
+
+    @Query(value = "SELECT u FROM User u ORDER BY id")
+    Page<User> findAllUsersWithPagination(Pageable pageable);
+
+    @Query(value = "SELECT * FROM Users ORDER BY id", countQuery = "SELECT count(*) FROM Users", nativeQuery = true)
+    Page<User> findAllUsersWithPaginationNative(Pageable pageable);
+
+    @Modifying
+    @Query("update User u set u.status = :status where u.name = :name")
+    int updateUserSetStatusForName(@Param("status") Integer status, @Param("name") String name);
+
+    @Modifying
+    @Query(value = "UPDATE Users u SET u.status = ? WHERE u.name = ?", nativeQuery = true)
+    int updateUserSetStatusForNameNative(Integer status, String name);
+
+    @Query(value = "INSERT INTO Users (name, age, email, status, active) VALUES (:name, :age, :email, :status, :active)", nativeQuery = true)
+    @Modifying
+    void insertUser(@Param("name") String name, @Param("age") Integer age, @Param("email") String email, @Param("status") Integer status, @Param("active") boolean active);
+    
+    @Modifying
+    @Query(value = "UPDATE Users u SET status = ? WHERE u.name = ?", nativeQuery = true)
+    int updateUserSetStatusForNameNativePostgres(Integer status, String name);
+    
+    @Query(value = "SELECT u FROM User u WHERE u.name IN :names")
+	  List<User> findUserByNameList(@Param("names") Collection<String> names);
+    
+    void deleteAllByCreationDateAfter(LocalDate date);
+
+    @Modifying(clearAutomatically = true, flushAutomatically = true)
+    @Query("update User u set u.active = false where u.lastLoginDate < :date")
+    void deactivateUsersNotLoggedInSince(@Param("date") LocalDate date);
+
+    @Modifying(clearAutomatically = true, flushAutomatically = true)
+    @Query("delete User u where u.active = false")
+    int deleteDeactivatedUsers();
+
+    @Modifying(clearAutomatically = true, flushAutomatically = true)
+    @Query(value = "alter table USERS add column deleted int(1) not null default 0", nativeQuery = true)
+    void addDeletedColumn();
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/user/UserRepositoryCustom.java

@@ -0,0 +1,14 @@
+package com.baeldung.boot.daos.user;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Set;
+import java.util.function.Predicate;
+
+import com.baeldung.boot.domain.User;
+
+public interface UserRepositoryCustom {
+    List<User> findUserByEmails(Set<String> emails);
+    
+    List<User> findAllUsersByPredicates(Collection<Predicate<User>> predicates);
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/daos/user/UserRepositoryCustomImpl.java

@@ -0,0 +1,57 @@
+package com.baeldung.boot.daos.user;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import javax.persistence.criteria.CriteriaBuilder;
+import javax.persistence.criteria.CriteriaQuery;
+import javax.persistence.criteria.Path;
+import javax.persistence.criteria.Predicate;
+import javax.persistence.criteria.Root;
+
+import com.baeldung.boot.domain.User;
+
+public class UserRepositoryCustomImpl implements UserRepositoryCustom {
+
+    @PersistenceContext
+    private EntityManager entityManager;
+
+    @Override
+    public List<User> findUserByEmails(Set<String> emails) {
+        CriteriaBuilder cb = entityManager.getCriteriaBuilder();
+        CriteriaQuery<User> query = cb.createQuery(User.class);
+        Root<User> user = query.from(User.class);
+
+        Path<String> emailPath = user.get("email");
+
+        List<Predicate> predicates = new ArrayList<>();
+        for (String email : emails) {
+
+            predicates.add(cb.like(emailPath, email));
+
+        }
+        query.select(user)
+            .where(cb.or(predicates.toArray(new Predicate[predicates.size()])));
+
+        return entityManager.createQuery(query)
+            .getResultList();
+    }
+    
+    @Override
+    public List<User> findAllUsersByPredicates(Collection<java.util.function.Predicate<User>> predicates) {
+        List<User> allUsers = entityManager.createQuery("select u from User u", User.class).getResultList();
+        Stream<User> allUsersStream = allUsers.stream();
+        for (java.util.function.Predicate<User> predicate : predicates) {
+            allUsersStream = allUsersStream.filter(predicate);
+        }
+
+        return allUsersStream.collect(Collectors.toList());
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/ddd/event/Aggregate.java

@@ -0,0 +1,46 @@
+/**
+ *
+ */
+package com.baeldung.boot.ddd.event;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Transient;
+
+import org.springframework.context.ApplicationEventPublisher;
+
+@Entity
+class Aggregate {
+    @Transient
+    private ApplicationEventPublisher eventPublisher;
+    @Id
+    private long id;
+
+    private Aggregate() {
+    }
+
+    Aggregate(long id, ApplicationEventPublisher eventPublisher) {
+        this.id = id;
+        this.eventPublisher = eventPublisher;
+    }
+
+    /* (non-Javadoc)
+     * @see java.lang.Object#toString()
+     */
+    @Override
+    public String toString() {
+        return "DomainEntity [id=" + id + "]";
+    }
+
+    void domainOperation() {
+        // some business logic
+        if (eventPublisher != null) {
+            eventPublisher.publishEvent(new DomainEvent());
+        }
+    }
+
+    long getId() {
+        return id;
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/ddd/event/Aggregate2.java

@@ -0,0 +1,44 @@
+/**
+ *
+ */
+package com.baeldung.boot.ddd.event;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.Transient;
+
+import org.springframework.data.domain.AfterDomainEventPublication;
+import org.springframework.data.domain.DomainEvents;
+
+@Entity
+public class Aggregate2 {
+    @Transient
+    private final Collection<DomainEvent> domainEvents;
+    @Id
+    @GeneratedValue
+    private long id;
+
+    public Aggregate2() {
+        domainEvents = new ArrayList<>();
+    }
+
+    @AfterDomainEventPublication
+    public void clearEvents() {
+        domainEvents.clear();
+    }
+
+    public void domainOperation() {
+        // some domain operation
+        domainEvents.add(new DomainEvent());
+    }
+
+    @DomainEvents
+    public Collection<DomainEvent> events() {
+        return domainEvents;
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/ddd/event/Aggregate2Repository.java

@@ -0,0 +1,10 @@
+/**
+ *
+ */
+package com.baeldung.boot.ddd.event;
+
+import org.springframework.data.repository.CrudRepository;
+
+public interface Aggregate2Repository extends CrudRepository<Aggregate2, Long> {
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/ddd/event/Aggregate3.java

@@ -0,0 +1,23 @@
+/**
+ *
+ */
+package com.baeldung.boot.ddd.event;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+import org.springframework.data.domain.AbstractAggregateRoot;
+
+@Entity
+public class Aggregate3 extends AbstractAggregateRoot<Aggregate3> {
+    @Id
+    @GeneratedValue
+    private long id;
+
+    public void domainOperation() {
+        // some domain operation
+        registerEvent(new DomainEvent());
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/ddd/event/Aggregate3Repository.java

@@ -0,0 +1,14 @@
+/**
+ * 
+ */
+package com.baeldung.boot.ddd.event;
+
+import org.springframework.data.repository.CrudRepository;
+
+/**
+ * @author goobar
+ *
+ */
+public interface Aggregate3Repository extends CrudRepository<Aggregate3, Long> {
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/ddd/event/AggregateRepository.java

@@ -0,0 +1,10 @@
+/**
+ *
+ */
+package com.baeldung.boot.ddd.event;
+
+import org.springframework.data.repository.CrudRepository;
+
+public interface AggregateRepository extends CrudRepository<Aggregate, Long> {
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/ddd/event/DddConfig.java

@@ -0,0 +1,15 @@
+/**
+ *
+ */
+package com.baeldung.boot.ddd.event;
+
+import org.springframework.boot.SpringBootConfiguration;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.context.annotation.PropertySource;
+
+@SpringBootConfiguration
+@EnableAutoConfiguration
+@PropertySource("classpath:/ddd.properties")
+public class DddConfig {
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/ddd/event/DomainEvent.java

@@ -0,0 +1,8 @@
+/**
+ *
+ */
+package com.baeldung.boot.ddd.event;
+
+class DomainEvent {
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/ddd/event/DomainService.java

@@ -0,0 +1,31 @@
+/**
+ *
+ */
+package com.baeldung.boot.ddd.event;
+
+import javax.transaction.Transactional;
+
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.stereotype.Service;
+
+@Service
+public class DomainService {
+    private final ApplicationEventPublisher eventPublisher;
+    private final AggregateRepository repository;
+
+    public DomainService(AggregateRepository repository, ApplicationEventPublisher eventPublisher) {
+        this.repository = repository;
+        this.eventPublisher = eventPublisher;
+    }
+
+    @Transactional
+    public void serviceDomainOperation(long entityId) {
+        repository.findById(entityId)
+            .ifPresent(entity -> {
+                entity.domainOperation();
+                repository.save(entity);
+                eventPublisher.publishEvent(new DomainEvent());
+            });
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/domain/Article.java

@@ -0,0 +1,23 @@
+package com.baeldung.boot.domain;
+
+import javax.persistence.*;
+import java.util.Date;
+
+@Entity
+public class Article {
+
+    @Id
+    @GeneratedValue
+    private Integer id;
+    @Temporal(TemporalType.DATE)
+    private Date publicationDate;
+    @Temporal(TemporalType.TIME)
+    private Date publicationTime;
+    @Temporal(TemporalType.TIMESTAMP)
+    private Date creationDateTime;
+
+    public Integer getId() {
+        return id;
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/domain/Bar.java

@@ -0,0 +1,220 @@
+package com.baeldung.boot.domain;
+
+import com.google.common.collect.Sets;
+import org.hibernate.annotations.OrderBy;
+import org.hibernate.envers.Audited;
+import org.jboss.logging.Logger;
+import org.springframework.data.annotation.CreatedBy;
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.annotation.LastModifiedBy;
+import org.springframework.data.annotation.LastModifiedDate;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+
+import javax.persistence.*;
+import java.io.Serializable;
+import java.util.Date;
+import java.util.Set;
+
+@Entity
+@NamedQuery(name = "Bar.findAll", query = "SELECT b FROM Bar b")
+@Audited
+@EntityListeners(AuditingEntityListener.class)
+public class Bar implements Serializable {
+
+    private static Logger logger = Logger.getLogger(Bar.class);
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    @Column(name = "id")
+    private int id;
+
+    @Column(name = "name")
+    private String name;
+    @OneToMany(mappedBy = "bar", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
+    @OrderBy(clause = "NAME DESC")
+    // @NotAudited
+    private Set<Foo> fooSet = Sets.newHashSet();
+    @Column(name = "operation")
+    private String operation;
+    @Column(name = "timestamp")
+    private long timestamp;
+    @Column(name = "created_date", updatable = false, nullable = false)
+    @CreatedDate
+    private long createdDate;
+    @Column(name = "modified_date")
+    @LastModifiedDate
+    private long modifiedDate;
+    @Column(name = "created_by")
+    @CreatedBy
+    private String createdBy;
+    @Column(name = "modified_by")
+    @LastModifiedBy
+    private String modifiedBy;
+
+    public Bar() {
+        super();
+    }
+
+    public Bar(final String name) {
+        super();
+
+        this.name = name;
+    }
+
+    public Set<Foo> getFooSet() {
+        return fooSet;
+    }
+
+    // API
+
+    public void setFooSet(final Set<Foo> fooSet) {
+        this.fooSet = fooSet;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(final int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(final String name) {
+        this.name = name;
+    }
+
+    public OPERATION getOperation() {
+        return OPERATION.parse(operation);
+    }
+
+    public void setOperation(final String operation) {
+        this.operation = operation;
+    }
+
+    public void setOperation(final OPERATION operation) {
+        this.operation = operation.getValue();
+    }
+
+    public long getTimestamp() {
+        return timestamp;
+    }
+
+    public void setTimestamp(final long timestamp) {
+        this.timestamp = timestamp;
+    }
+
+    public long getCreatedDate() {
+        return createdDate;
+    }
+
+    public void setCreatedDate(final long createdDate) {
+        this.createdDate = createdDate;
+    }
+
+    public long getModifiedDate() {
+        return modifiedDate;
+    }
+
+    public void setModifiedDate(final long modifiedDate) {
+        this.modifiedDate = modifiedDate;
+    }
+
+    public String getCreatedBy() {
+        return createdBy;
+    }
+
+    public void setCreatedBy(final String createdBy) {
+        this.createdBy = createdBy;
+    }
+
+    public String getModifiedBy() {
+        return modifiedBy;
+    }
+
+    public void setModifiedBy(final String modifiedBy) {
+        this.modifiedBy = modifiedBy;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((name == null) ? 0 : name.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        final Bar other = (Bar) obj;
+        if (name == null) {
+            if (other.name != null)
+                return false;
+        } else if (!name.equals(other.name))
+            return false;
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder builder = new StringBuilder();
+        builder.append("Bar [name=").append(name).append("]");
+        return builder.toString();
+    }
+
+    @PrePersist
+    public void onPrePersist() {
+        logger.info("@PrePersist");
+        audit(OPERATION.INSERT);
+    }
+
+    @PreUpdate
+    public void onPreUpdate() {
+        logger.info("@PreUpdate");
+        audit(OPERATION.UPDATE);
+    }
+
+    @PreRemove
+    public void onPreRemove() {
+        logger.info("@PreRemove");
+        audit(OPERATION.DELETE);
+    }
+
+    private void audit(final OPERATION operation) {
+        setOperation(operation);
+        setTimestamp((new Date()).getTime());
+    }
+
+    public enum OPERATION {
+        INSERT, UPDATE, DELETE;
+        private String value;
+
+        OPERATION() {
+            value = toString();
+        }
+
+        public static OPERATION parse(final String value) {
+            OPERATION operation = null;
+            for (final OPERATION op : OPERATION.values()) {
+                if (op.getValue().equals(value)) {
+                    operation = op;
+                    break;
+                }
+            }
+            return operation;
+        }
+
+        public String getValue() {
+            return value;
+        }
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/domain/Customer.java

@@ -0,0 +1,56 @@
+package com.baeldung.boot.domain;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+/**
+ * Customer Entity class
+ * @author ysharma2512
+ *
+ */
+@Entity
+public class Customer {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+    private String firstName;
+    private String lastName;
+
+    public Customer(String firstName, String lastName) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    @Override
+    public String toString() {
+        return String.format("Customer[id=%d, firstName='%s', lastName='%s']", id, firstName, lastName);
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/domain/Foo.java

@@ -0,0 +1,94 @@
+package com.baeldung.boot.domain;
+
+import org.hibernate.envers.Audited;
+
+import javax.persistence.*;
+import java.io.Serializable;
+
+@NamedNativeQueries({@NamedNativeQuery(name = "callGetAllFoos", query = "CALL GetAllFoos()", resultClass = Foo.class), @NamedNativeQuery(name = "callGetFoosByName", query = "CALL GetFoosByName(:fooName)", resultClass = Foo.class)})
+@Entity
+@Audited
+// @Proxy(lazy = false)
+public class Foo implements Serializable {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    @Column(name = "id")
+    private long id;
+
+    @Column(name = "name", nullable = false)
+    private String name;
+
+    @ManyToOne(targetEntity = Bar.class, cascade = CascadeType.ALL, fetch = FetchType.EAGER)
+    @JoinColumn(name = "BAR_ID")
+    private Bar bar = new Bar();
+
+    public Foo() {
+        super();
+    }
+
+    public Foo(final String name) {
+        super();
+        this.name = name;
+    }
+
+    //
+
+    public Bar getBar() {
+        return bar;
+    }
+
+    public void setBar(final Bar bar) {
+        this.bar = bar;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(final long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(final String name) {
+        this.name = name;
+    }
+
+    //
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((name == null) ? 0 : name.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        final Foo other = (Foo) obj;
+        if (name == null) {
+            if (other.name != null)
+                return false;
+        } else if (!name.equals(other.name))
+            return false;
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder builder = new StringBuilder();
+        builder.append("Foo [name=").append(name).append("]");
+        return builder.toString();
+    }
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/domain/Item.java

@@ -0,0 +1,81 @@
+package com.baeldung.boot.domain;
+
+import java.math.BigDecimal;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.ManyToOne;
+
+@Entity
+public class Item {
+
+    private String color;
+    private String grade;
+
+    @Id
+    private Long id;
+
+    @ManyToOne
+    private ItemType itemType;
+
+    private String name;
+    private BigDecimal price;
+    @ManyToOne
+    private Store store;
+
+    public String getColor() {
+        return color;
+    }
+
+    public String getGrade() {
+        return grade;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public ItemType getItemType() {
+        return itemType;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public BigDecimal getPrice() {
+        return price;
+    }
+
+    public Store getStore() {
+        return store;
+    }
+
+    public void setColor(String color) {
+        this.color = color;
+    }
+
+    public void setGrade(String grade) {
+        this.grade = grade;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public void setItemType(ItemType itemType) {
+        this.itemType = itemType;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setPrice(BigDecimal price) {
+        this.price = price;
+    }
+
+    public void setStore(Store store) {
+        this.store = store;
+    }
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/domain/ItemType.java

@@ -0,0 +1,46 @@
+package com.baeldung.boot.domain;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.OneToMany;
+
+@Entity
+public class ItemType {
+
+    @Id
+    private Long id;
+    @OneToMany(cascade = CascadeType.ALL)
+    @JoinColumn(name = "ITEM_TYPE_ID")
+    private List<Item> items = new ArrayList<>();
+
+    private String name;
+
+    public Long getId() {
+        return id;
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/domain/KVTag.java

@@ -0,0 +1,34 @@
+package com.baeldung.boot.domain;
+
+import javax.persistence.Embeddable;
+
+@Embeddable
+public class KVTag {
+    private String key;
+    private String value;
+
+    public KVTag() {
+    }
+
+    public KVTag(String key, String value) {
+        super();
+        this.key = key;
+        this.value = value;
+    }
+
+    public String getKey() {
+        return key;
+    }
+
+    public void setKey(String key) {
+        this.key = key;
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    public void setValue(String value) {
+        this.value = value;
+    }
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/domain/Location.java

@@ -0,0 +1,55 @@
+package com.baeldung.boot.domain;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.OneToMany;
+
+@Entity
+public class Location {
+
+    private String city;
+    private String country;
+    @Id
+    private Long id;
+
+    @OneToMany(cascade = CascadeType.ALL)
+    @JoinColumn(name = "LOCATION_ID")
+    private List<Store> stores = new ArrayList<>();
+
+    public String getCity() {
+        return city;
+    }
+
+    public String getCountry() {
+        return country;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public List<Store> getStores() {
+        return stores;
+    }
+
+    public void setCity(String city) {
+        this.city = city;
+    }
+
+    public void setCountry(String country) {
+        this.country = country;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public void setStores(List<Store> stores) {
+        this.stores = stores;
+    }
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/domain/MerchandiseEntity.java

@@ -0,0 +1,66 @@
+package com.baeldung.boot.domain;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import java.math.BigDecimal;
+
+@Entity
+public class MerchandiseEntity {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    private String title;
+
+    private BigDecimal price;
+
+    private String brand;
+
+    public MerchandiseEntity() {
+    }
+
+    public MerchandiseEntity(String title, BigDecimal price) {
+        this.title = title;
+        this.price = price;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public BigDecimal getPrice() {
+        return price;
+    }
+
+    public void setPrice(BigDecimal price) {
+        this.price = price;
+    }
+
+    public String getBrand() {
+        return brand;
+    }
+
+    public void setBrand(String brand) {
+        this.brand = brand;
+    }
+
+    @Override
+    public String toString() {
+        return "MerchandiseEntity{" +
+                "id=" + id +
+                ", title='" + title + '\'' +
+                ", price=" + price +
+                ", brand='" + brand + '\'' +
+                '}';
+    }
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/domain/Person.java

@@ -0,0 +1,47 @@
+package com.baeldung.boot.domain;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+
+@Entity
+public class Person {
+
+    @Id
+    private Long id;
+    private String firstName;
+    private String lastName;
+
+    public Person() {
+    }
+
+    public Person(Long id, String firstName, String lastName) {
+        this.id = id;
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/domain/Possession.java

@@ -0,0 +1,83 @@
+package com.baeldung.boot.domain;
+
+import javax.persistence.*;
+import com.baeldung.boot.domain.Possession;
+
+@Entity
+@Table
+public class Possession {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    private String name;
+
+    public Possession() {
+        super();
+    }
+
+    public Possession(final String name) {
+        super();
+
+        this.name = name;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(final int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(final String name) {
+        this.name = name;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = (prime * result) + (int) (id ^ (id >>> 32));
+        result = (prime * result) + ((name == null) ? 0 : name.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final Possession other = (Possession) obj;
+        if (id != other.id) {
+            return false;
+        }
+        if (name == null) {
+            if (other.name != null) {
+                return false;
+            }
+        } else if (!name.equals(other.name)) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder builder = new StringBuilder();
+        builder.append("Possesion [id=").append(id).append(", name=").append(name).append("]");
+        return builder.toString();
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/domain/SkillTag.java

@@ -0,0 +1,30 @@
+package com.baeldung.boot.domain;
+
+import javax.persistence.Embeddable;
+
+@Embeddable
+public class SkillTag {
+    private String name;
+    private int value;
+
+    public SkillTag() {
+    }
+
+    public SkillTag(String name, int value) {
+        super();
+        this.name = name;
+        this.value = value;
+    }
+
+    public int getValue() {
+        return value;
+    }
+
+    public void setValue(int value) {
+        this.value = value;
+    }
+
+    public String getName() {
+        return name;
+    }
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/domain/Store.java

@@ -0,0 +1,76 @@
+package com.baeldung.boot.domain;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.persistence.CascadeType;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.ManyToOne;
+import javax.persistence.OneToMany;
+
+@Entity
+public class Store {
+
+    private Boolean active;
+    @Id
+    private Long id;
+    @OneToMany(cascade = CascadeType.ALL)
+    @JoinColumn(name = "STORE_ID")
+    private List<Item> items = new ArrayList<>();
+    private Long itemsSold;
+
+    @ManyToOne
+    private Location location;
+
+    private String name;
+
+    public Boolean getActive() {
+        return active;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public List<Item> getItems() {
+        return items;
+    }
+
+    public Long getItemsSold() {
+        return itemsSold;
+    }
+
+    public Location getLocation() {
+        return location;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setActive(Boolean active) {
+        this.active = active;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public void setItems(List<Item> items) {
+        this.items = items;
+    }
+
+    public void setItemsSold(Long itemsSold) {
+        this.itemsSold = itemsSold;
+    }
+
+    public void setLocation(Location location) {
+        this.location = location;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/domain/Student.java

@@ -0,0 +1,74 @@
+package com.baeldung.boot.domain;
+
+import javax.persistence.ElementCollection;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import java.util.ArrayList;
+import java.util.List;
+
+@Entity
+public class Student {
+
+    @Id
+    private long id;
+    private String name;
+
+    @ElementCollection
+    private List<String> tags = new ArrayList<>();
+
+    @ElementCollection
+    private List<SkillTag> skillTags = new ArrayList<>();
+
+    @ElementCollection
+    private List<KVTag> kvTags = new ArrayList<>();
+
+    public Student() {
+    }
+
+    public Student(long id, String name) {
+        super();
+        this.id = id;
+        this.name = name;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public List<String> getTags() {
+        return tags;
+    }
+
+    public void setTags(List<String> tags) {
+        this.tags.addAll(tags);
+    }
+
+    public List<SkillTag> getSkillTags() {
+        return skillTags;
+    }
+
+    public void setSkillTags(List<SkillTag> skillTags) {
+        this.skillTags.addAll(skillTags);
+    }
+
+    public List<KVTag> getKVTags() {
+        return this.kvTags;
+    }
+
+    public void setKVTags(List<KVTag> kvTags) {
+        this.kvTags.addAll(kvTags);
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/domain/User.java

@@ -0,0 +1,132 @@
+package com.baeldung.boot.domain;
+
+import javax.persistence.*;
+
+import java.time.LocalDate;
+import java.util.List;
+import java.util.Objects;
+
+@Entity
+@Table(name = "users")
+public class User {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private int id;
+    private String name;
+    private LocalDate creationDate;
+    private LocalDate lastLoginDate;
+    private boolean active;
+    private int age;
+    @Column(unique = true, nullable = false)
+    private String email;
+    private Integer status;
+    @OneToMany
+    List<Possession> possessionList;
+
+    public User() {
+        super();
+    }
+
+    public User(String name,  LocalDate creationDate,String email, Integer status) {
+        this.name = name;
+        this.creationDate = creationDate;
+        this.email = email;
+        this.status = status;
+        this.active = true;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(final int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(final String name) {
+        this.name = name;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(final String email) {
+        this.email = email;
+    }
+
+    public Integer getStatus() {
+        return status;
+    }
+
+    public void setStatus(Integer status) {
+        this.status = status;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(final int age) {
+        this.age = age;
+    }
+    
+    public LocalDate getCreationDate() {
+        return creationDate;
+    }
+
+    public List<Possession> getPossessionList() {
+        return possessionList;
+    }
+
+    public void setPossessionList(List<Possession> possessionList) {
+        this.possessionList = possessionList;
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder builder = new StringBuilder();
+        builder.append("User [name=").append(name).append(", id=").append(id).append("]");
+        return builder.toString();
+    }
+    
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        User user = (User) o;
+        return id == user.id &&
+          age == user.age &&
+          Objects.equals(name, user.name) &&
+          Objects.equals(creationDate, user.creationDate) &&
+          Objects.equals(email, user.email) &&
+          Objects.equals(status, user.status);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, name, creationDate, age, email, status);
+    }
+
+    public LocalDate getLastLoginDate() {
+        return lastLoginDate;
+    }
+
+    public void setLastLoginDate(LocalDate lastLoginDate) {
+        this.lastLoginDate = lastLoginDate;
+    }
+
+    public boolean isActive() {
+        return active;
+    }
+
+    public void setActive(boolean active) {
+        this.active = active;
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/passenger/CustomPassengerRepository.java

@@ -0,0 +1,8 @@
+package com.baeldung.boot.passenger;
+
+import java.util.List;
+
+interface CustomPassengerRepository {
+
+    List<Passenger> findOrderedBySeatNumberLimitedTo(int limit);
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/passenger/Passenger.java

@@ -0,0 +1,82 @@
+package com.baeldung.boot.passenger;
+
+import javax.persistence.Basic;
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import java.util.Objects;
+
+@Entity
+class Passenger {
+
+    @Id
+    @GeneratedValue
+    @Column(nullable = false)
+    private Long id;
+
+    @Basic(optional = false)
+    @Column(nullable = false)
+    private String firstName;
+
+    @Basic(optional = false)
+    @Column(nullable = false)
+    private String lastName;
+
+    @Basic(optional = false)
+    @Column(nullable = false)
+    private Integer seatNumber;
+
+    private Passenger(String firstName, String lastName, Integer seatNumber) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.seatNumber = seatNumber;
+    }
+
+    static Passenger from(String firstName, String lastName, Integer seatNumber) {
+        return new Passenger(firstName, lastName, seatNumber);
+    }
+
+    @Override
+    public boolean equals(Object object) {
+        if (this == object)
+            return true;
+        if (object == null || getClass() != object.getClass())
+            return false;
+        Passenger passenger = (Passenger) object;
+        return getSeatNumber() == passenger.getSeatNumber() && Objects.equals(getFirstName(), passenger.getFirstName())
+          && Objects.equals(getLastName(), passenger.getLastName());
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(getFirstName(), getLastName(), getSeatNumber());
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder toStringBuilder = new StringBuilder(getClass().getSimpleName());
+        toStringBuilder.append("{ id=").append(id);
+        toStringBuilder.append(", firstName='").append(firstName).append('\'');
+        toStringBuilder.append(", lastName='").append(lastName).append('\'');
+        toStringBuilder.append(", seatNumber=").append(seatNumber);
+        toStringBuilder.append('}');
+        return toStringBuilder.toString();
+    }
+
+    Long getId() {
+        return id;
+    }
+
+    String getFirstName() {
+        return firstName;
+    }
+
+    String getLastName() {
+        return lastName;
+    }
+
+    Integer getSeatNumber() {
+        return seatNumber;
+    }
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/passenger/PassengerRepository.java

@@ -0,0 +1,22 @@
+package com.baeldung.boot.passenger;
+
+import org.springframework.data.domain.Sort;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+
+interface PassengerRepository extends JpaRepository<Passenger, Long>, CustomPassengerRepository {
+
+    Passenger findFirstByOrderBySeatNumberAsc();
+
+    Passenger findTopByOrderBySeatNumberAsc();
+
+    List<Passenger> findByOrderBySeatNumberAsc();
+    
+    List<Passenger> findByLastNameOrderBySeatNumberAsc(String lastName);
+    
+    List<Passenger> findByLastName(String lastName, Sort sort);
+
+    List<Passenger> findByFirstNameIgnoreCase(String firstName);
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/passenger/PassengerRepositoryImpl.java

@@ -0,0 +1,20 @@
+package com.baeldung.boot.passenger;
+
+import org.springframework.stereotype.Repository;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import java.util.List;
+
+@Repository
+class PassengerRepositoryImpl implements CustomPassengerRepository {
+
+    @PersistenceContext
+    private EntityManager entityManager;
+
+    @Override
+    public List<Passenger> findOrderedBySeatNumberLimitedTo(int limit) {
+        return entityManager.createQuery("SELECT p FROM Passenger p ORDER BY p.seatNumber",
+          Passenger.class).setMaxResults(limit).getResultList();
+    }
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/services/IBarService.java

@@ -0,0 +1,7 @@
+package com.baeldung.boot.services;
+
+import com.baeldung.boot.domain.Bar;
+
+public interface IBarService extends IOperations<Bar> {
+    //
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/services/IFooService.java

@@ -0,0 +1,14 @@
+package com.baeldung.boot.services;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+
+import com.baeldung.boot.domain.Foo;
+
+public interface IFooService extends IOperations<Foo> {
+
+    Foo retrieveByName(String name);
+    
+    Page<Foo> findPaginated(Pageable pageable);
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/services/IOperations.java

@@ -0,0 +1,26 @@
+package com.baeldung.boot.services;
+
+import org.springframework.data.domain.Page;
+
+import java.io.Serializable;
+import java.util.List;
+
+public interface IOperations<T extends Serializable> {
+
+    T findOne(final long id);
+
+    List<T> findAll();
+
+    Page<T> findPaginated(int page, int size);
+
+    // write
+
+    T create(final T entity);
+
+    T update(final T entity);
+
+    void delete(final T entity);
+
+    void deleteById(final long entityId);
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/services/impl/AbstractService.java

@@ -0,0 +1,61 @@
+package com.baeldung.boot.services.impl;
+
+import com.baeldung.boot.services.IOperations;
+import com.google.common.collect.Lists;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.repository.PagingAndSortingRepository;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.io.Serializable;
+import java.util.List;
+
+@Transactional
+public abstract class AbstractService<T extends Serializable> implements IOperations<T> {
+
+    // read - one
+
+    @Override
+    @Transactional(readOnly = true)
+    public T findOne(final long id) {
+        return getDao().findById(id).orElse(null);
+    }
+
+    // read - all
+
+    @Override
+    @Transactional(readOnly = true)
+    public List<T> findAll() {
+        return Lists.newArrayList(getDao().findAll());
+    }
+
+    @Override
+    public Page<T> findPaginated(final int page, final int size) {
+        return getDao().findAll(new PageRequest(page, size));
+    }
+
+    // write
+
+    @Override
+    public T create(final T entity) {
+        return getDao().save(entity);
+    }
+
+    @Override
+    public T update(final T entity) {
+        return getDao().save(entity);
+    }
+
+    @Override
+    public void delete(final T entity) {
+        getDao().delete(entity);
+    }
+
+    @Override
+    public void deleteById(final long entityId) {
+        getDao().deleteById(entityId);
+    }
+
+    protected abstract PagingAndSortingRepository<T, Long> getDao();
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/services/impl/AbstractSpringDataJpaService.java

@@ -0,0 +1,45 @@
+package com.baeldung.boot.services.impl;
+
+import com.baeldung.boot.services.IOperations;
+import com.google.common.collect.Lists;
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.io.Serializable;
+import java.util.List;
+
+@Transactional(value = "transactionManager")
+public abstract class AbstractSpringDataJpaService<T extends Serializable> implements IOperations<T> {
+
+    @Override
+    public T findOne(final long id) {
+        return getDao().findById(id).orElse(null);
+    }
+
+    @Override
+    public List<T> findAll() {
+        return Lists.newArrayList(getDao().findAll());
+    }
+
+    @Override
+    public T create(final T entity) {
+        return getDao().save(entity);
+    }
+
+    @Override
+    public T update(final T entity) {
+        return getDao().save(entity);
+    }
+
+    @Override
+    public void delete(final T entity) {
+        getDao().delete(entity);
+    }
+
+    @Override
+    public void deleteById(final long entityId) {
+        getDao().deleteById(entityId);
+    }
+
+    protected abstract CrudRepository<T, Serializable> getDao();
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/services/impl/BarSpringDataJpaService.java

@@ -0,0 +1,31 @@
+package com.baeldung.boot.services.impl;
+
+import com.baeldung.boot.daos.IBarCrudRepository;
+import com.baeldung.boot.domain.Bar;
+import com.baeldung.boot.services.IBarService;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Page;
+import org.springframework.data.repository.CrudRepository;
+
+import java.io.Serializable;
+
+public class BarSpringDataJpaService extends AbstractSpringDataJpaService<Bar> implements IBarService {
+
+    @Autowired
+    private IBarCrudRepository dao;
+
+    public BarSpringDataJpaService() {
+        super();
+    }
+
+    @Override
+    protected CrudRepository<Bar, Serializable> getDao() {
+        return dao;
+    }
+
+    @Override
+    public Page<Bar> findPaginated(int page, int size) {
+        throw new UnsupportedOperationException("Not implemented yet");
+    }
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/services/impl/FooService.java

@@ -0,0 +1,55 @@
+package com.baeldung.boot.services.impl;
+
+import com.google.common.collect.Lists;
+import com.baeldung.boot.daos.IFooDao;
+import com.baeldung.boot.domain.Foo;
+import com.baeldung.boot.services.IFooService;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.repository.PagingAndSortingRepository;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+
+@Service
+@Transactional
+public class FooService extends AbstractService<Foo> implements IFooService {
+
+    @Autowired
+    private IFooDao dao;
+
+    public FooService() {
+        super();
+    }
+
+    // API
+
+    @Override
+    protected PagingAndSortingRepository<Foo, Long> getDao() {
+        return dao;
+    }
+
+    // custom methods
+
+    @Override
+    public Foo retrieveByName(final String name) {
+        return dao.retrieveByName(name);
+    }
+
+    // overridden to be secured
+
+    @Override
+    @Transactional(readOnly = true)
+    public List<Foo> findAll() {
+        return Lists.newArrayList(getDao().findAll());
+    }
+
+    @Override
+    public Page<Foo> findPaginated(Pageable pageable) {
+        return dao.findAll(pageable);
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/boot/web/controllers/CustomerController.java

@@ -0,0 +1,43 @@
+package com.baeldung.boot.web.controllers;
+
+import java.net.URISyntaxException;
+import java.util.Arrays;
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.boot.daos.CustomerRepository;
+import com.baeldung.boot.domain.Customer;
+
+/**
+ * A simple controller to test the JPA CrudRepository operations
+ * controllers
+ * 
+ * @author ysharma2512
+ *
+ */
+@RestController
+public class CustomerController {
+
+    @Autowired
+    CustomerRepository customerRepository;
+
+    public CustomerController(CustomerRepository customerRepository2) {
+        this.customerRepository = customerRepository2;
+    }
+
+    @PostMapping("/customers")
+    public ResponseEntity<List<Customer>> insertCustomers() throws URISyntaxException {
+        Customer c1 = new Customer("James", "Gosling");
+        Customer c2 = new Customer("Doug", "Lea");
+        Customer c3 = new Customer("Martin", "Fowler");
+        Customer c4 = new Customer("Brian", "Goetz");
+        List<Customer> customers = Arrays.asList(c1, c2, c3, c4);
+        customerRepository.saveAll(customers);
+        return ResponseEntity.ok(customers);
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/multipledb/MultipleDbApplication.java

@@ -0,0 +1,14 @@
+package com.baeldung.multipledb;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class MultipleDbApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(MultipleDbApplication.class, args);
+    }
+    
+}
+

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/multipledb/PersistenceProductAutoConfiguration.java

@@ -0,0 +1,71 @@
+package com.baeldung.multipledb;
+
+import java.util.HashMap;
+
+import javax.sql.DataSource;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.jdbc.DataSourceBuilder;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Profile;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.core.env.Environment;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.orm.jpa.JpaTransactionManager;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
+import org.springframework.transaction.PlatformTransactionManager;
+
+/**
+ * By default, the persistence-multiple-db.properties file is read for 
+ * non auto configuration in PersistenceProductConfiguration. 
+ * <p>
+ * If we need to use persistence-multiple-db-boot.properties and auto configuration 
+ * then uncomment the below @Configuration class and comment out PersistenceProductConfiguration. 
+ */
+//@Configuration
+@PropertySource({"classpath:persistence-multiple-db-boot.properties"})
+@EnableJpaRepositories(basePackages = "com.baeldung.multipledb.dao.product", entityManagerFactoryRef = "productEntityManager", transactionManagerRef = "productTransactionManager")
+@Profile("!tc")
+public class PersistenceProductAutoConfiguration {
+    @Autowired
+    private Environment env;
+
+    public PersistenceProductAutoConfiguration() {
+        super();
+    }
+
+    //
+
+    @Bean
+    public LocalContainerEntityManagerFactoryBean productEntityManager() {
+        final LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
+        em.setDataSource(productDataSource());
+        em.setPackagesToScan("com.baeldung.multipledb.model.product");
+
+        final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
+        em.setJpaVendorAdapter(vendorAdapter);
+        final HashMap<String, Object> properties = new HashMap<String, Object>();
+        properties.put("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
+        properties.put("hibernate.dialect", env.getProperty("hibernate.dialect"));
+        em.setJpaPropertyMap(properties);
+
+        return em;
+    }
+    
+    @Bean
+    @ConfigurationProperties(prefix="spring.second-datasource")
+    public DataSource productDataSource() {
+        return DataSourceBuilder.create().build();
+    }
+
+    @Bean
+    public PlatformTransactionManager productTransactionManager() {
+        final JpaTransactionManager transactionManager = new JpaTransactionManager();
+        transactionManager.setEntityManagerFactory(productEntityManager().getObject());
+        return transactionManager;
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/multipledb/PersistenceProductConfiguration.java

@@ -0,0 +1,68 @@
+package com.baeldung.multipledb;
+
+import com.google.common.base.Preconditions;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Profile;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.core.env.Environment;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+import org.springframework.orm.jpa.JpaTransactionManager;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
+import org.springframework.transaction.PlatformTransactionManager;
+
+import javax.sql.DataSource;
+import java.util.HashMap;
+
+@Configuration
+@PropertySource({"classpath:persistence-multiple-db.properties"})
+@EnableJpaRepositories(basePackages = "com.baeldung.multipledb.dao.product", entityManagerFactoryRef = "productEntityManager", transactionManagerRef = "productTransactionManager")
+@Profile("!tc")
+public class PersistenceProductConfiguration {
+    @Autowired
+    private Environment env;
+
+    public PersistenceProductConfiguration() {
+        super();
+    }
+
+    //
+
+    @Bean
+    public LocalContainerEntityManagerFactoryBean productEntityManager() {
+        final LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
+        em.setDataSource(productDataSource());
+        em.setPackagesToScan("com.baeldung.multipledb.model.product");
+
+        final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
+        em.setJpaVendorAdapter(vendorAdapter);
+        final HashMap<String, Object> properties = new HashMap<String, Object>();
+        properties.put("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
+        properties.put("hibernate.dialect", env.getProperty("hibernate.dialect"));
+        em.setJpaPropertyMap(properties);
+
+        return em;
+    }
+
+    @Bean
+    public DataSource productDataSource() {
+        final DriverManagerDataSource dataSource = new DriverManagerDataSource();
+        dataSource.setDriverClassName(Preconditions.checkNotNull(env.getProperty("jdbc.driverClassName")));
+        dataSource.setUrl(Preconditions.checkNotNull(env.getProperty("product.jdbc.url")));
+        dataSource.setUsername(Preconditions.checkNotNull(env.getProperty("jdbc.user")));
+        dataSource.setPassword(Preconditions.checkNotNull(env.getProperty("jdbc.pass")));
+
+        return dataSource;
+    }
+
+    @Bean
+    public PlatformTransactionManager productTransactionManager() {
+        final JpaTransactionManager transactionManager = new JpaTransactionManager();
+        transactionManager.setEntityManagerFactory(productEntityManager().getObject());
+        return transactionManager;
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/multipledb/PersistenceUserAutoConfiguration.java

@@ -0,0 +1,75 @@
+package com.baeldung.multipledb;
+
+import java.util.HashMap;
+
+import javax.sql.DataSource;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.jdbc.DataSourceBuilder;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+import org.springframework.context.annotation.Profile;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.core.env.Environment;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.orm.jpa.JpaTransactionManager;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
+import org.springframework.transaction.PlatformTransactionManager;
+
+/**
+ * By default, the persistence-multiple-db.properties file is read for 
+ * non auto configuration in PersistenceUserConfiguration. 
+ * <p>
+ * If we need to use persistence-multiple-db-boot.properties and auto configuration 
+ * then uncomment the below @Configuration class and comment out PersistenceUserConfiguration. 
+ */
+//@Configuration
+@PropertySource({"classpath:persistence-multiple-db-boot.properties"})
+@EnableJpaRepositories(basePackages = "com.baeldung.multipledb.dao.user", entityManagerFactoryRef = "userEntityManager", transactionManagerRef = "userTransactionManager")
+@Profile("!tc")
+public class PersistenceUserAutoConfiguration {
+    @Autowired
+    private Environment env;
+
+    public PersistenceUserAutoConfiguration() {
+        super();
+    }
+
+    //
+
+    @Primary
+    @Bean
+    public LocalContainerEntityManagerFactoryBean userEntityManager() {
+        final LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
+        em.setDataSource(userDataSource());
+        em.setPackagesToScan("com.baeldung.multipledb.model.user");
+
+        final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
+        em.setJpaVendorAdapter(vendorAdapter);
+        final HashMap<String, Object> properties = new HashMap<String, Object>();
+        properties.put("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
+        properties.put("hibernate.dialect", env.getProperty("hibernate.dialect"));
+        em.setJpaPropertyMap(properties);
+
+        return em;
+    }
+
+    @Bean
+    @Primary
+    @ConfigurationProperties(prefix="spring.datasource")
+    public DataSource userDataSource() {
+        return DataSourceBuilder.create().build();
+    }
+
+    @Primary
+    @Bean
+    public PlatformTransactionManager userTransactionManager() {
+        final JpaTransactionManager transactionManager = new JpaTransactionManager();
+        transactionManager.setEntityManagerFactory(userEntityManager().getObject());
+        return transactionManager;
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/multipledb/PersistenceUserConfiguration.java

@@ -0,0 +1,69 @@
+package com.baeldung.multipledb;
+
+import com.google.common.base.Preconditions;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.*;
+import org.springframework.core.env.Environment;
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+import org.springframework.orm.jpa.JpaTransactionManager;
+import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
+import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
+import org.springframework.transaction.PlatformTransactionManager;
+
+import javax.sql.DataSource;
+import java.util.HashMap;
+
+@Configuration
+@PropertySource({"classpath:persistence-multiple-db.properties"})
+@EnableJpaRepositories(basePackages = "com.baeldung.multipledb.dao.user", entityManagerFactoryRef = "userEntityManager", transactionManagerRef = "userTransactionManager")
+@Profile("!tc")
+public class PersistenceUserConfiguration {
+    @Autowired
+    private Environment env;
+
+    public PersistenceUserConfiguration() {
+        super();
+    }
+
+    //
+
+    @Primary
+    @Bean
+    public LocalContainerEntityManagerFactoryBean userEntityManager() {
+        System.out.println("loading config");
+        final LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
+        em.setDataSource(userDataSource());
+        em.setPackagesToScan("com.baeldung.multipledb.model.user");
+
+        final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
+        em.setJpaVendorAdapter(vendorAdapter);
+        final HashMap<String, Object> properties = new HashMap<String, Object>();
+        properties.put("hibernate.hbm2ddl.auto", env.getProperty("hibernate.hbm2ddl.auto"));
+        properties.put("hibernate.dialect", env.getProperty("hibernate.dialect"));
+        em.setJpaPropertyMap(properties);
+
+        return em;
+    }
+
+    @Primary
+    @Bean
+    public DataSource userDataSource() {
+        final DriverManagerDataSource dataSource = new DriverManagerDataSource();
+        dataSource.setDriverClassName(Preconditions.checkNotNull(env.getProperty("jdbc.driverClassName")));
+        dataSource.setUrl(Preconditions.checkNotNull(env.getProperty("user.jdbc.url")));
+        dataSource.setUsername(Preconditions.checkNotNull(env.getProperty("jdbc.user")));
+        dataSource.setPassword(Preconditions.checkNotNull(env.getProperty("jdbc.pass")));
+
+        return dataSource;
+    }
+
+    @Primary
+    @Bean
+    public PlatformTransactionManager userTransactionManager() {
+        final JpaTransactionManager transactionManager = new JpaTransactionManager();
+        transactionManager.setEntityManagerFactory(userEntityManager().getObject());
+        return transactionManager;
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/multipledb/dao/product/ProductRepository.java

@@ -0,0 +1,13 @@
+package com.baeldung.multipledb.dao.product;
+
+import java.util.List;
+
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.repository.PagingAndSortingRepository;
+
+import com.baeldung.multipledb.model.product.ProductMultipleDB;
+
+public interface ProductRepository extends PagingAndSortingRepository<ProductMultipleDB, Integer> {
+
+    List<ProductMultipleDB> findAllByPrice(double price, Pageable pageable);
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/multipledb/dao/user/PossessionRepository.java

@@ -0,0 +1,9 @@
+package com.baeldung.multipledb.dao.user;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.baeldung.multipledb.model.user.PossessionMultipleDB;
+
+public interface PossessionRepository extends JpaRepository<PossessionMultipleDB, Long> {
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/multipledb/dao/user/UserRepository.java

@@ -0,0 +1,8 @@
+package com.baeldung.multipledb.dao.user;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.baeldung.multipledb.model.user.UserMultipleDB;
+
+public interface UserRepository extends JpaRepository<UserMultipleDB, Integer> {
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/multipledb/model/product/ProductMultipleDB.java

@@ -0,0 +1,67 @@
+package com.baeldung.multipledb.model.product;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+@Entity
+@Table(schema = "products")
+public class ProductMultipleDB {
+
+    @Id
+    private int id;
+
+    private String name;
+
+    private double price;
+
+    public ProductMultipleDB() {
+        super();
+    }
+
+    private ProductMultipleDB(int id, String name, double price) {
+        super();
+        this.id = id;
+        this.name = name;
+        this.price = price;
+    }
+
+    public static ProductMultipleDB from(int id, String name, double price) {
+        return new ProductMultipleDB(id, name, price);
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(final int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(final String name) {
+        this.name = name;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public void setPrice(final double price) {
+        this.price = price;
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder builder = new StringBuilder();
+        builder.append("Product [name=")
+            .append(name)
+            .append(", id=")
+            .append(id)
+            .append("]");
+        return builder.toString();
+    }
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/multipledb/model/user/PossessionMultipleDB.java

@@ -0,0 +1,82 @@
+package com.baeldung.multipledb.model.user;
+
+import javax.persistence.*;
+
+@Entity
+@Table
+public class PossessionMultipleDB {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    private String name;
+
+    public PossessionMultipleDB() {
+        super();
+    }
+
+    public PossessionMultipleDB(final String name) {
+        super();
+
+        this.name = name;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(final int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(final String name) {
+        this.name = name;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = (prime * result) + (int) (id ^ (id >>> 32));
+        result = (prime * result) + ((name == null) ? 0 : name.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final PossessionMultipleDB other = (PossessionMultipleDB) obj;
+        if (id != other.id) {
+            return false;
+        }
+        if (name == null) {
+            if (other.name != null) {
+                return false;
+            }
+        } else if (!name.equals(other.name)) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder builder = new StringBuilder();
+        builder.append("Possesion [id=").append(id).append(", name=").append(name).append("]");
+        return builder.toString();
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/multipledb/model/user/UserMultipleDB.java

@@ -0,0 +1,88 @@
+package com.baeldung.multipledb.model.user;
+
+import javax.persistence.*;
+
+import java.util.List;
+
+@Entity
+@Table(name = "users")
+public class UserMultipleDB {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private int id;
+    private String name;
+    private int age;
+    @Column(unique = true, nullable = false)
+    private String email;
+    private Integer status;
+    
+    @OneToMany
+    List<PossessionMultipleDB> possessionList;
+  
+    public UserMultipleDB() {
+        super();
+    }
+
+    public UserMultipleDB(String name, String email, Integer status) {
+        this.name = name;
+        this.email = email;
+        this.status = status;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(final int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(final String name) {
+        this.name = name;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(final String email) {
+        this.email = email;
+    }
+
+    public Integer getStatus() {
+        return status;
+    }
+
+    public void setStatus(Integer status) {
+        this.status = status;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(final int age) {
+        this.age = age;
+    }
+
+    public List<PossessionMultipleDB> getPossessionList() {
+        return possessionList;
+    }
+
+    public void setPossessionList(List<PossessionMultipleDB> possessionList) {
+        this.possessionList = possessionList;
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder builder = new StringBuilder();
+        builder.append("User [name=").append(name).append(", id=").append(id).append("]");
+        return builder.toString();
+    }
+
+}

persistence-modules/spring-data-jpa/src/main/resources/application.properties

@@ -0,0 +1,6 @@
+spring.main.allow-bean-definition-overriding=true
+
+spring.jpa.properties.hibernate.jdbc.batch_size=4
+spring.jpa.properties.hibernate.order_inserts=true
+spring.jpa.properties.hibernate.order_updates=true
+spring.jpa.properties.hibernate.generate_statistics=true

persistence-modules/spring-data-jpa/src/main/resources/ddd.properties

@@ -0,0 +1 @@
+spring.datasource.initialization-mode=never

persistence-modules/spring-data-jpa/src/main/resources/import_entities.sql

@@ -0,0 +1,21 @@
+insert into Article(id, publication_date, publication_time, creation_date_time) values(1, TO_DATE('01/01/2018', 'DD/MM/YYYY'), TO_DATE('15:00', 'HH24:MI'), TO_DATE('31/12/2017 07:30', 'DD/MM/YYYY HH24:MI'));
+insert into Article(id, publication_date, publication_time, creation_date_time) values(2, TO_DATE('01/01/2018', 'DD/MM/YYYY'), TO_DATE('15:30', 'HH24:MI'), TO_DATE('15/12/2017 08:00', 'DD/MM/YYYY HH24:MI'));
+insert into Article(id, publication_date, publication_time, creation_date_time) values(3, TO_DATE('15/12/2017', 'DD/MM/YYYY'), TO_DATE('16:00', 'HH24:MI'), TO_DATE('01/12/2017 13:45', 'DD/MM/YYYY HH24:MI'));
+
+insert into location (id, country, city) values (1, 'Country X', 'City One');
+insert into location (id, country, city) values (2, 'Country X', 'City Two');
+insert into location (id, country, city) values (3, 'Country X', 'City Three');
+
+insert into store (id, name, location_id, items_sold, active) values (1, 'Store One', 3, 130000, true);
+insert into store (id, name, location_id, items_sold, active) values (2, 'Store Two', 1, 170000, false);
+
+insert into item_type (id, name) values (1, 'Food');
+insert into item_type (id, name) values (2, 'Furniture');
+insert into item_type (id, name) values (3, 'Electronics');
+
+insert into item (id, name, store_id, item_type_id, price, grade, color) values (1, 'Food Item One', 1, 1, 100, 'A', 'Color x');
+insert into item (id, name, store_id, item_type_id, price, grade, color) values (2, 'Furniture Item One', 1, 2, 2500, 'B', 'Color y');
+insert into item (id, name, store_id, item_type_id, price, grade, color) values (3, 'Food Item Two', 1, 1, 35, 'A', 'Color z');
+insert into item (id, name, store_id, item_type_id, price, grade, color) values (5, 'Furniture Item Two', 2, 2, 1600, 'A', 'Color w');
+insert into item (id, name, store_id, item_type_id, price, grade, color) values (6, 'Food Item Three', 2, 1, 5, 'B', 'Color a');
+insert into item (id, name, store_id, item_type_id, price, grade, color) values (7, 'Electronics Item One', 2, 3, 999, 'B', 'Color b');

persistence-modules/spring-data-jpa/src/main/resources/logback.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

persistence-modules/spring-data-jpa/src/main/resources/persistence-multiple-db-boot.properties

@@ -0,0 +1,11 @@
+hibernate.hbm2ddl.auto=create-drop
+hibernate.cache.use_second_level_cache=false
+hibernate.cache.use_query_cache=false
+
+spring.datasource.jdbcUrl=jdbc:h2:mem:spring_jpa_user;DB_CLOSE_DELAY=-1;INIT=CREATE SCHEMA IF NOT EXISTS USERS
+spring.datasource.username=sa
+spring.datasource.password=sa
+
+spring.second-datasource.jdbcUrl=jdbc:h2:mem:spring_jpa_product;DB_CLOSE_DELAY=-1;INIT=CREATE SCHEMA IF NOT EXISTS PRODUCTS
+spring.second-datasource.username=sa
+spring.second-datasource.password=sa

persistence-modules/spring-data-jpa/src/main/resources/persistence-multiple-db.properties

@@ -0,0 +1,13 @@
+# jdbc.X
+jdbc.driverClassName=org.h2.Driver
+user.jdbc.url=jdbc:h2:mem:spring_jpa_user;DB_CLOSE_DELAY=-1;INIT=CREATE SCHEMA IF NOT EXISTS USERS
+product.jdbc.url=jdbc:h2:mem:spring_jpa_product;DB_CLOSE_DELAY=-1;INIT=CREATE SCHEMA IF NOT EXISTS PRODUCTS
+jdbc.user=sa
+jdbc.pass=sa
+
+# hibernate.X
+hibernate.dialect=org.hibernate.dialect.H2Dialect
+hibernate.show_sql=false
+hibernate.hbm2ddl.auto=create-drop
+hibernate.cache.use_second_level_cache=false
+hibernate.cache.use_query_cache=false

persistence-modules/spring-data-jpa/src/main/resources/persistence.properties

@@ -0,0 +1,14 @@
+# jdbc.X
+jdbc.driverClassName=org.h2.Driver
+jdbc.url=jdbc:h2:mem:db;DB_CLOSE_DELAY=-1;INIT=CREATE SCHEMA IF NOT EXISTS USERS
+jdbc.user=sa
+jdbc.pass=sa
+
+# hibernate.X
+hibernate.dialect=org.hibernate.dialect.H2Dialect
+hibernate.show_sql=true
+hibernate.hbm2ddl.auto=create-drop
+hibernate.cache.use_second_level_cache=true
+hibernate.cache.use_query_cache=true
+hibernate.cache.region.factory_class=org.hibernate.cache.ehcache.EhCacheRegionFactory
+

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/batchinserts/BatchInsertIntegrationTest.java

@@ -0,0 +1,40 @@
+package com.baeldung.batchinserts;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+
+import com.baeldung.boot.Application;
+import com.baeldung.boot.daos.CustomerRepository;
+import com.baeldung.boot.web.controllers.CustomerController;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes=Application.class)
+@AutoConfigureMockMvc
+public class BatchInsertIntegrationTest {
+
+    @Autowired
+    private CustomerRepository customerRepository;
+    private MockMvc mockMvc;
+    @Before
+    public void setUp() throws Exception {
+        mockMvc = MockMvcBuilders.standaloneSetup( new CustomerController(customerRepository))
+            .build();
+    }
+
+    @Test
+    public void whenInsertingCustomers_thenCustomersAreCreated() throws Exception {
+        this.mockMvc.perform(post("/customers"))
+            .andExpect(status().isOk());
+    }    
+   
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/daos/ArticleRepositoryIntegrationTest.java

@@ -0,0 +1,72 @@
+package com.baeldung.boot.daos;
+
+import com.baeldung.boot.Application;
+import com.baeldung.boot.config.PersistenceConfiguration;
+import com.baeldung.boot.daos.ArticleRepository;
+import com.baeldung.boot.domain.Article;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Import;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.text.SimpleDateFormat;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+@RunWith(SpringRunner.class)
+@DataJpaTest(properties="spring.datasource.data=classpath:import_entities.sql")
+public class ArticleRepositoryIntegrationTest {
+
+    @Autowired
+    private ArticleRepository repository;
+
+    @Test
+    public void givenImportedArticlesWhenFindAllByPublicationDateThenArticles1And2Returned()
+      throws Exception {
+        List<Article> result = repository.findAllByPublicationDate(
+          new SimpleDateFormat("yyyy-MM-dd").parse("2018-01-01")
+        );
+
+        assertEquals(2, result.size());
+        assertTrue(result.stream()
+          .map(Article::getId)
+          .allMatch(id -> Arrays.asList(1, 2).contains(id))
+        );
+    }
+
+    @Test
+    public void givenImportedArticlesWhenFindAllByPublicationTimeBetweenThenArticles2And3Returned()
+      throws Exception {
+        List<Article> result = repository.findAllByPublicationTimeBetween(
+          new SimpleDateFormat("HH:mm").parse("15:15"),
+          new SimpleDateFormat("HH:mm").parse("16:30")
+        );
+
+        assertEquals(2, result.size());
+        assertTrue(result.stream()
+          .map(Article::getId)
+          .allMatch(id -> Arrays.asList(2, 3).contains(id))
+        );
+    }
+
+    @Test
+    public void givenImportedArticlesWhenFindAllWithCreationDateTimeBeforeThenArticles2And3Returned() throws Exception {
+        List<Article> result = repository.findAllWithCreationDateTimeBefore(
+          new SimpleDateFormat("yyyy-MM-dd HH:mm").parse("2017-12-15 10:00")
+        );
+
+        assertEquals(2, result.size());
+        assertTrue(result.stream()
+          .map(Article::getId)
+          .allMatch(id -> Arrays.asList(2, 3).contains(id))
+        );
+    }
+
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/daos/ExtendedStudentRepositoryIntegrationTest.java

@@ -0,0 +1,42 @@
+package com.baeldung.boot.daos;
+
+import com.baeldung.boot.Application;
+import com.baeldung.boot.config.PersistenceConfiguration;
+import com.baeldung.boot.daos.ExtendedStudentRepository;
+import com.baeldung.boot.domain.Student;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import javax.annotation.Resource;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@RunWith(SpringRunner.class)
+@ContextConfiguration(classes = {Application.class})
+@DirtiesContext
+public class ExtendedStudentRepositoryIntegrationTest {
+    @Resource
+    private ExtendedStudentRepository extendedStudentRepository;
+
+    @Before
+    public void setup() {
+        Student student = new Student(1, "john");
+        extendedStudentRepository.save(student);
+        Student student2 = new Student(2, "johnson");
+        extendedStudentRepository.save(student2);
+        Student student3 = new Student(3, "tom");
+        extendedStudentRepository.save(student3);
+    }
+
+    @Test
+    public void givenStudents_whenFindByName_thenGetOk() {
+        List<Student> students = extendedStudentRepository.findByAttributeContainsText("name", "john");
+        assertThat(students.size()).isEqualTo(2);
+    }
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/daos/InventoryRepositoryIntegrationTest.java

@@ -0,0 +1,64 @@
+package com.baeldung.boot.daos;
+
+import com.baeldung.boot.Application;
+import com.baeldung.boot.config.PersistenceConfiguration;
+import com.baeldung.boot.daos.InventoryRepository;
+import com.baeldung.boot.domain.MerchandiseEntity;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import java.math.BigDecimal;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNotNull;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes=Application.class)
+public class InventoryRepositoryIntegrationTest {
+
+    private static final String ORIGINAL_TITLE = "Pair of Pants";
+    private static final String UPDATED_TITLE = "Branded Luxury Pants";
+    private static final String UPDATED_BRAND = "Armani";
+    private static final String ORIGINAL_SHORTS_TITLE = "Pair of Shorts";
+
+    @Autowired
+    private InventoryRepository repository;
+
+    @Test
+    public void shouldCreateNewEntryInDB() {
+        MerchandiseEntity pants = new MerchandiseEntity(ORIGINAL_TITLE, BigDecimal.ONE);
+        pants = repository.save(pants);
+
+        MerchandiseEntity shorts = new MerchandiseEntity(ORIGINAL_SHORTS_TITLE, new BigDecimal(3));
+        shorts = repository.save(shorts);
+
+        assertNotNull(pants.getId());
+        assertNotNull(shorts.getId());
+        assertNotEquals(pants.getId(), shorts.getId());
+    }
+
+    @Test
+    public void shouldUpdateExistingEntryInDB() {
+        MerchandiseEntity pants = new MerchandiseEntity(ORIGINAL_TITLE, BigDecimal.ONE);
+        pants = repository.save(pants);
+
+        Long originalId = pants.getId();
+
+        pants.setTitle(UPDATED_TITLE);
+        pants.setPrice(BigDecimal.TEN);
+        pants.setBrand(UPDATED_BRAND);
+
+        MerchandiseEntity result = repository.save(pants);
+
+        assertEquals(originalId, result.getId());
+        assertEquals(UPDATED_TITLE, result.getTitle());
+        assertEquals(BigDecimal.TEN, result.getPrice());
+        assertEquals(UPDATED_BRAND, result.getBrand());
+    }
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/daos/JpaRepositoriesIntegrationTest.java

@@ -0,0 +1,102 @@
+package com.baeldung.boot.daos;
+
+import static junit.framework.TestCase.assertEquals;
+import static junit.framework.TestCase.assertFalse;
+import static junit.framework.TestCase.assertNotNull;
+import static junit.framework.TestCase.assertNull;
+import static junit.framework.TestCase.assertTrue;
+
+import java.util.List;
+import java.util.Optional;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import com.baeldung.boot.Application;
+import com.baeldung.boot.config.PersistenceConfiguration;
+import com.baeldung.boot.daos.ItemTypeRepository;
+import com.baeldung.boot.daos.LocationRepository;
+import com.baeldung.boot.daos.ReadOnlyLocationRepository;
+import com.baeldung.boot.daos.StoreRepository;
+import com.baeldung.boot.domain.Item;
+import com.baeldung.boot.domain.ItemType;
+import com.baeldung.boot.domain.Location;
+import com.baeldung.boot.domain.Store;
+import com.baeldung.multipledb.PersistenceProductConfiguration;
+import com.baeldung.multipledb.PersistenceUserConfiguration;
+
+@RunWith(SpringRunner.class)
+@DataJpaTest(properties="spring.datasource.data=classpath:import_entities.sql")
+public class JpaRepositoriesIntegrationTest {
+    @Autowired
+    private LocationRepository locationRepository;
+    @Autowired
+    private StoreRepository storeRepository;
+    @Autowired
+    private ItemTypeRepository compositeRepository;
+    @Autowired
+    private ReadOnlyLocationRepository readOnlyRepository;
+
+    @Test
+    public void whenSaveLocation_ThenGetSameLocation() {
+        Location location = new Location();
+        location.setId(100L);
+        location.setCountry("Country H");
+        location.setCity("City Hundred");
+        location = locationRepository.saveAndFlush(location);
+
+        Location otherLocation = locationRepository.getOne(location.getId());
+        assertEquals("Country H", otherLocation.getCountry());
+        assertEquals("City Hundred", otherLocation.getCity());
+
+        locationRepository.delete(otherLocation);
+    }
+
+    @Test
+    public void givenLocationId_whenFindStores_thenGetStores() {
+        List<Store> stores = storeRepository.findStoreByLocationId(1L);
+        assertEquals(1, stores.size());
+    }
+
+    @Test
+    public void givenItemTypeId_whenDeleted_ThenItemTypeDeleted() {
+        Optional<ItemType> itemType = compositeRepository.findById(1L);
+        assertTrue(itemType.isPresent());
+        compositeRepository.deleteCustom(itemType.get());
+        itemType = compositeRepository.findById(1L);
+        assertFalse(itemType.isPresent());
+    }
+
+    @Test
+    public void givenItemId_whenUsingCustomRepo_ThenDeleteAppropriateEntity() {
+        Item item = compositeRepository.findItemById(1L);
+        assertNotNull(item);
+        compositeRepository.deleteCustom(item);
+        item = compositeRepository.findItemById(1L);
+        assertNull(item);
+    }
+
+    @Test
+    public void givenItemAndItemType_WhenAmbiguousDeleteCalled_ThenItemTypeDeletedAndNotItem() {
+        Optional<ItemType> itemType = compositeRepository.findById(1L);
+        assertTrue(itemType.isPresent());
+        Item item = compositeRepository.findItemById(2L);
+        assertNotNull(item);
+
+        compositeRepository.findThenDelete(1L);
+        Optional<ItemType> sameItemType = compositeRepository.findById(1L);
+        assertFalse(sameItemType.isPresent());
+        Item sameItem = compositeRepository.findItemById(2L);
+        assertNotNull(sameItem);
+    }
+
+    @Test
+    public void whenCreatingReadOnlyRepo_thenHaveOnlyReadOnlyOperationsAvailable() {
+        Optional<Location> location = readOnlyRepository.findById(1L);
+        assertNotNull(location);
+    }
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/daos/PersonInsertRepositoryIntegrationTest.java

@@ -0,0 +1,82 @@
+package com.baeldung.boot.daos;
+
+import com.baeldung.boot.daos.impl.PersonInsertRepository;
+import com.baeldung.boot.domain.Person;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.context.annotation.Import;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import javax.persistence.EntityExistsException;
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceException;
+
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+@RunWith(SpringRunner.class)
+@DataJpaTest
+@Import(PersonInsertRepository.class)
+public class PersonInsertRepositoryIntegrationTest {
+
+    private static final Long ID = 1L;
+    private static final String FIRST_NAME = "firstname";
+    private static final String LAST_NAME = "lastname";
+    private static final Person PERSON = new Person(ID, FIRST_NAME, LAST_NAME);
+
+    @Autowired
+    private PersonInsertRepository personInsertRepository;
+
+    @Autowired
+    private EntityManager entityManager;
+
+    @Test
+    public void givenPersonEntity_whenInsertWithNativeQuery_ThenPersonIsPersisted() {
+        insertWithQuery();
+
+        assertPersonPersisted();
+    }
+
+    @Test
+    public void givenPersonEntity_whenInsertedTwiceWithNativeQuery_thenPersistenceExceptionExceptionIsThrown() {
+        assertThatExceptionOfType(PersistenceException.class).isThrownBy(() -> {
+            insertWithQuery();
+            insertWithQuery();
+        });
+    }
+
+    @Test
+    public void givenPersonEntity_whenInsertWithEntityManager_thenPersonIsPersisted() {
+        insertPersonWithEntityManager();
+
+        assertPersonPersisted();
+    }
+
+    @Test
+    public void givenPersonEntity_whenInsertedTwiceWithEntityManager_thenEntityExistsExceptionIsThrown() {
+        assertThatExceptionOfType(EntityExistsException.class).isThrownBy(() -> {
+            insertPersonWithEntityManager();
+            insertPersonWithEntityManager();
+        });
+    }
+
+    private void insertWithQuery() {
+        personInsertRepository.insertWithQuery(PERSON);
+    }
+
+    private void insertPersonWithEntityManager() {
+        personInsertRepository.insertWithEntityManager(new Person(ID, FIRST_NAME, LAST_NAME));
+    }
+
+    private void assertPersonPersisted() {
+        Person person = entityManager.find(Person.class, ID);
+
+        assertThat(person).isNotNull();
+        assertThat(person.getId()).isEqualTo(PERSON.getId());
+        assertThat(person.getFirstName()).isEqualTo(PERSON.getFirstName());
+        assertThat(person.getLastName()).isEqualTo(PERSON.getLastName());
+    }
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/daos/UserRepositoryCommon.java

@@ -0,0 +1,545 @@
+package com.baeldung.boot.daos;
+
+import org.junit.After;
+import org.junit.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Sort;
+import org.springframework.data.jpa.domain.JpaSort;
+import org.springframework.data.mapping.PropertyReferenceException;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.baeldung.boot.daos.user.UserRepository;
+import com.baeldung.boot.domain.User;
+
+import javax.persistence.EntityManager;
+import javax.persistence.Query;
+import java.time.LocalDate;
+import java.util.*;
+import java.util.function.Predicate;
+import java.util.stream.Stream;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assert.*;
+
+public class UserRepositoryCommon {
+
+    final String USER_EMAIL = "email@example.com";
+    final String USER_EMAIL2 = "email2@example.com";
+    final String USER_EMAIL3 = "email3@example.com";
+    final String USER_EMAIL4 = "email4@example.com";
+    final Integer INACTIVE_STATUS = 0;
+    final Integer ACTIVE_STATUS = 1;
+    final String USER_EMAIL5 = "email5@example.com";
+    final String USER_EMAIL6 = "email6@example.com";
+    final String USER_NAME_ADAM = "Adam";
+    final String USER_NAME_PETER = "Peter";
+
+    @Autowired
+    protected UserRepository userRepository;
+    @Autowired
+    private EntityManager entityManager;
+
+    @Test
+    @Transactional
+    public void givenUsersWithSameNameInDB_WhenFindAllByName_ThenReturnStreamOfUsers() {
+        User user1 = new User();
+        user1.setName(USER_NAME_ADAM);
+        user1.setEmail(USER_EMAIL);
+        userRepository.save(user1);
+
+        User user2 = new User();
+        user2.setName(USER_NAME_ADAM);
+        user2.setEmail(USER_EMAIL2);
+        userRepository.save(user2);
+
+        User user3 = new User();
+        user3.setName(USER_NAME_ADAM);
+        user3.setEmail(USER_EMAIL3);
+        userRepository.save(user3);
+
+        User user4 = new User();
+        user4.setName("SAMPLE");
+        user4.setEmail(USER_EMAIL4);
+        userRepository.save(user4);
+
+        try (Stream<User> foundUsersStream = userRepository.findAllByName(USER_NAME_ADAM)) {
+            assertThat(foundUsersStream.count()).isEqualTo(3l);
+        }
+    }
+
+    @Test
+    public void givenUsersInDB_WhenFindAllWithQueryAnnotation_ThenReturnCollectionWithActiveUsers() {
+        User user1 = new User();
+        user1.setName(USER_NAME_ADAM);
+        user1.setEmail(USER_EMAIL);
+        user1.setStatus(ACTIVE_STATUS);
+        userRepository.save(user1);
+
+        User user2 = new User();
+        user2.setName(USER_NAME_ADAM);
+        user2.setEmail(USER_EMAIL2);
+        user2.setStatus(ACTIVE_STATUS);
+        userRepository.save(user2);
+
+        User user3 = new User();
+        user3.setName(USER_NAME_ADAM);
+        user3.setEmail(USER_EMAIL3);
+        user3.setStatus(INACTIVE_STATUS);
+        userRepository.save(user3);
+
+        Collection<User> allActiveUsers = userRepository.findAllActiveUsers();
+
+        assertThat(allActiveUsers.size()).isEqualTo(2);
+    }
+
+    @Test
+    public void givenUsersInDB_WhenFindAllWithQueryAnnotationNative_ThenReturnCollectionWithActiveUsers() {
+        User user1 = new User();
+        user1.setName(USER_NAME_ADAM);
+        user1.setEmail(USER_EMAIL);
+        user1.setStatus(ACTIVE_STATUS);
+        userRepository.save(user1);
+
+        User user2 = new User();
+        user2.setName(USER_NAME_ADAM);
+        user2.setEmail(USER_EMAIL2);
+        user2.setStatus(ACTIVE_STATUS);
+        userRepository.save(user2);
+
+        User user3 = new User();
+        user3.setName(USER_NAME_ADAM);
+        user3.setEmail(USER_EMAIL3);
+        user3.setStatus(INACTIVE_STATUS);
+        userRepository.save(user3);
+
+        Collection<User> allActiveUsers = userRepository.findAllActiveUsersNative();
+
+        assertThat(allActiveUsers.size()).isEqualTo(2);
+    }
+
+    @Test
+    public void givenUserInDB_WhenFindUserByStatusWithQueryAnnotation_ThenReturnActiveUser() {
+        User user = new User();
+        user.setName(USER_NAME_ADAM);
+        user.setEmail(USER_EMAIL);
+        user.setStatus(ACTIVE_STATUS);
+        userRepository.save(user);
+
+        User userByStatus = userRepository.findUserByStatus(ACTIVE_STATUS);
+
+        assertThat(userByStatus.getName()).isEqualTo(USER_NAME_ADAM);
+    }
+
+    @Test
+    public void givenUserInDB_WhenFindUserByStatusWithQueryAnnotationNative_ThenReturnActiveUser() {
+        User user = new User();
+        user.setName(USER_NAME_ADAM);
+        user.setEmail(USER_EMAIL);
+        user.setStatus(ACTIVE_STATUS);
+        userRepository.save(user);
+
+        User userByStatus = userRepository.findUserByStatusNative(ACTIVE_STATUS);
+
+        assertThat(userByStatus.getName()).isEqualTo(USER_NAME_ADAM);
+    }
+
+    @Test
+    public void givenUsersInDB_WhenFindUserByStatusAndNameWithQueryAnnotationIndexedParams_ThenReturnOneUser() {
+        User user = new User();
+        user.setName(USER_NAME_ADAM);
+        user.setEmail(USER_EMAIL);
+        user.setStatus(ACTIVE_STATUS);
+        userRepository.save(user);
+
+        User user2 = new User();
+        user2.setName(USER_NAME_PETER);
+        user2.setEmail(USER_EMAIL2);
+        user2.setStatus(ACTIVE_STATUS);
+        userRepository.save(user2);
+
+        User userByStatus = userRepository.findUserByStatusAndName(ACTIVE_STATUS, USER_NAME_ADAM);
+
+        assertThat(userByStatus.getName()).isEqualTo(USER_NAME_ADAM);
+    }
+
+    @Test
+    public void givenUsersInDB_WhenFindUserByStatusAndNameWithQueryAnnotationNamedParams_ThenReturnOneUser() {
+        User user = new User();
+        user.setName(USER_NAME_ADAM);
+        user.setEmail(USER_EMAIL);
+        user.setStatus(ACTIVE_STATUS);
+        userRepository.save(user);
+
+        User user2 = new User();
+        user2.setName(USER_NAME_PETER);
+        user2.setEmail(USER_EMAIL2);
+        user2.setStatus(ACTIVE_STATUS);
+        userRepository.save(user2);
+
+        User userByStatus = userRepository.findUserByStatusAndNameNamedParams(ACTIVE_STATUS, USER_NAME_ADAM);
+
+        assertThat(userByStatus.getName()).isEqualTo(USER_NAME_ADAM);
+    }
+
+    @Test
+    public void givenUsersInDB_WhenFindUserByStatusAndNameWithQueryAnnotationNativeNamedParams_ThenReturnOneUser() {
+        User user = new User();
+        user.setName(USER_NAME_ADAM);
+        user.setEmail(USER_EMAIL);
+        user.setStatus(ACTIVE_STATUS);
+        userRepository.save(user);
+
+        User user2 = new User();
+        user2.setName(USER_NAME_PETER);
+        user2.setEmail(USER_EMAIL2);
+        user2.setStatus(ACTIVE_STATUS);
+        userRepository.save(user2);
+
+        User userByStatus = userRepository.findUserByStatusAndNameNamedParamsNative(ACTIVE_STATUS, USER_NAME_ADAM);
+
+        assertThat(userByStatus.getName()).isEqualTo(USER_NAME_ADAM);
+    }
+
+    @Test
+    public void givenUsersInDB_WhenFindUserByStatusAndNameWithQueryAnnotationNamedParamsCustomNames_ThenReturnOneUser() {
+        User user = new User();
+        user.setName(USER_NAME_ADAM);
+        user.setEmail(USER_EMAIL);
+        user.setStatus(ACTIVE_STATUS);
+        userRepository.save(user);
+
+        User user2 = new User();
+        user2.setName(USER_NAME_PETER);
+        user2.setEmail(USER_EMAIL2);
+        user2.setStatus(ACTIVE_STATUS);
+        userRepository.save(user2);
+
+        User userByStatus = userRepository.findUserByUserStatusAndUserName(ACTIVE_STATUS, USER_NAME_ADAM);
+
+        assertThat(userByStatus.getName()).isEqualTo(USER_NAME_ADAM);
+    }
+
+    @Test
+    public void givenUsersInDB_WhenFindUserByNameLikeWithQueryAnnotationIndexedParams_ThenReturnUser() {
+        User user = new User();
+        user.setName(USER_NAME_ADAM);
+        user.setEmail(USER_EMAIL);
+        user.setStatus(ACTIVE_STATUS);
+        userRepository.save(user);
+
+        User userByStatus = userRepository.findUserByNameLike("Ad");
+
+        assertThat(userByStatus.getName()).isEqualTo(USER_NAME_ADAM);
+    }
+
+    @Test
+    public void givenUsersInDB_WhenFindUserByNameLikeWithQueryAnnotationNamedParams_ThenReturnUser() {
+        User user = new User();
+        user.setName(USER_NAME_ADAM);
+        user.setEmail(USER_EMAIL);
+        user.setStatus(ACTIVE_STATUS);
+        userRepository.save(user);
+
+        User userByStatus = userRepository.findUserByNameLikeNamedParam("Ad");
+
+        assertThat(userByStatus.getName()).isEqualTo(USER_NAME_ADAM);
+    }
+
+    @Test
+    public void givenUsersInDB_WhenFindUserByNameLikeWithQueryAnnotationNative_ThenReturnUser() {
+        User user = new User();
+        user.setName(USER_NAME_ADAM);
+        user.setEmail(USER_EMAIL);
+        user.setStatus(ACTIVE_STATUS);
+        userRepository.save(user);
+
+        User userByStatus = userRepository.findUserByNameLikeNative("Ad");
+
+        assertThat(userByStatus.getName()).isEqualTo(USER_NAME_ADAM);
+    }
+
+    @Test
+    public void givenUsersInDB_WhenFindAllWithSortByName_ThenReturnUsersSorted() {
+        userRepository.save(new User(USER_NAME_ADAM, LocalDate.now(), USER_EMAIL, ACTIVE_STATUS));
+        userRepository.save(new User(USER_NAME_PETER, LocalDate.now(), USER_EMAIL2, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE", LocalDate.now(), USER_EMAIL3, INACTIVE_STATUS));
+
+        List<User> usersSortByName = userRepository.findAll(new Sort(Sort.Direction.ASC, "name"));
+
+        assertThat(usersSortByName.get(0)
+          .getName()).isEqualTo(USER_NAME_ADAM);
+    }
+
+    @Test(expected = PropertyReferenceException.class)
+    public void givenUsersInDB_WhenFindAllSortWithFunction_ThenThrowException() {
+        userRepository.save(new User(USER_NAME_ADAM, LocalDate.now(), USER_EMAIL, ACTIVE_STATUS));
+        userRepository.save(new User(USER_NAME_PETER, LocalDate.now(), USER_EMAIL2, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE", LocalDate.now(), USER_EMAIL3, INACTIVE_STATUS));
+
+        userRepository.findAll(new Sort(Sort.Direction.ASC, "name"));
+
+        List<User> usersSortByNameLength = userRepository.findAll(Sort.by("LENGTH(name)"));
+
+        assertThat(usersSortByNameLength.get(0)
+          .getName()).isEqualTo(USER_NAME_ADAM);
+    }
+
+    @Test
+    public void givenUsersInDB_WhenFindAllSortWithFunctionQueryAnnotationJPQL_ThenReturnUsersSorted() {
+        userRepository.save(new User(USER_NAME_ADAM, LocalDate.now(), USER_EMAIL, ACTIVE_STATUS));
+        userRepository.save(new User(USER_NAME_PETER, LocalDate.now(), USER_EMAIL2, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE", LocalDate.now(), USER_EMAIL3, INACTIVE_STATUS));
+
+        userRepository.findAllUsers(Sort.by("name"));
+
+        List<User> usersSortByNameLength = userRepository.findAllUsers(JpaSort.unsafe("LENGTH(name)"));
+
+        assertThat(usersSortByNameLength.get(0)
+          .getName()).isEqualTo(USER_NAME_ADAM);
+    }
+
+    @Test
+    public void givenUsersInDB_WhenFindAllWithPageRequestQueryAnnotationJPQL_ThenReturnPageOfUsers() {
+        userRepository.save(new User(USER_NAME_ADAM, LocalDate.now(), USER_EMAIL, ACTIVE_STATUS));
+        userRepository.save(new User(USER_NAME_PETER, LocalDate.now(), USER_EMAIL2, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE", LocalDate.now(), USER_EMAIL3, INACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE1", LocalDate.now(), USER_EMAIL4, INACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE2", LocalDate.now(), USER_EMAIL5, INACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE3", LocalDate.now(), USER_EMAIL6, INACTIVE_STATUS));
+
+        Page<User> usersPage = userRepository.findAllUsersWithPagination(PageRequest.of(1, 3));
+
+        assertThat(usersPage.getContent()
+          .get(0)
+          .getName()).isEqualTo("SAMPLE1");
+    }
+
+    @Test
+    public void givenUsersInDB_WhenFindAllWithPageRequestQueryAnnotationNative_ThenReturnPageOfUsers() {
+        userRepository.save(new User(USER_NAME_ADAM, LocalDate.now(), USER_EMAIL, ACTIVE_STATUS));
+        userRepository.save(new User(USER_NAME_PETER, LocalDate.now(), USER_EMAIL2, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE", LocalDate.now(), USER_EMAIL3, INACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE1", LocalDate.now(), USER_EMAIL4, INACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE2", LocalDate.now(), USER_EMAIL5, INACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE3", LocalDate.now(), USER_EMAIL6, INACTIVE_STATUS));
+
+        Page<User> usersSortByNameLength = userRepository.findAllUsersWithPaginationNative(PageRequest.of(1, 3));
+
+        assertThat(usersSortByNameLength.getContent()
+          .get(0)
+          .getName()).isEqualTo(USER_NAME_PETER);
+    }
+
+    @Test
+    @Transactional
+    public void givenUsersInDB_WhenUpdateStatusForNameModifyingQueryAnnotationJPQL_ThenModifyMatchingUsers() {
+        userRepository.save(new User("SAMPLE", LocalDate.now(), USER_EMAIL, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE1", LocalDate.now(), USER_EMAIL2, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE", LocalDate.now(), USER_EMAIL3, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE3", LocalDate.now(), USER_EMAIL4, ACTIVE_STATUS));
+
+        int updatedUsersSize = userRepository.updateUserSetStatusForName(INACTIVE_STATUS, "SAMPLE");
+
+        assertThat(updatedUsersSize).isEqualTo(2);
+    }
+
+    @Test
+    public void givenUsersInDB_WhenFindByEmailsWithDynamicQuery_ThenReturnCollection() {
+
+        User user1 = new User();
+        user1.setEmail(USER_EMAIL);
+        userRepository.save(user1);
+
+        User user2 = new User();
+        user2.setEmail(USER_EMAIL2);
+        userRepository.save(user2);
+
+        User user3 = new User();
+        user3.setEmail(USER_EMAIL3);
+        userRepository.save(user3);
+
+        Set<String> emails = new HashSet<>();
+        emails.add(USER_EMAIL2);
+        emails.add(USER_EMAIL3);
+
+        Collection<User> usersWithEmails = userRepository.findUserByEmails(emails);
+
+        assertThat(usersWithEmails.size()).isEqualTo(2);
+    }
+
+    @Test
+    public void givenUsersInDBWhenFindByNameListReturnCollection() {
+
+        User user1 = new User();
+        user1.setName(USER_NAME_ADAM);
+        user1.setEmail(USER_EMAIL);
+        userRepository.save(user1);
+
+        User user2 = new User();
+        user2.setName(USER_NAME_PETER);
+        user2.setEmail(USER_EMAIL2);
+        userRepository.save(user2);
+
+        List<String> names = Arrays.asList(USER_NAME_ADAM, USER_NAME_PETER);
+
+        List<User> usersWithNames = userRepository.findUserByNameList(names);
+
+        assertThat(usersWithNames.size()).isEqualTo(2);
+    }
+
+
+    @Test
+    @Transactional
+    public void whenInsertedWithQuery_ThenUserIsPersisted() {
+        userRepository.insertUser(USER_NAME_ADAM, 1, USER_EMAIL, ACTIVE_STATUS, true);
+        userRepository.insertUser(USER_NAME_PETER, 1, USER_EMAIL2, ACTIVE_STATUS, true);
+
+        User userAdam = userRepository.findUserByNameLike(USER_NAME_ADAM);
+        User userPeter = userRepository.findUserByNameLike(USER_NAME_PETER);
+
+        assertThat(userAdam).isNotNull();
+        assertThat(userAdam.getEmail()).isEqualTo(USER_EMAIL);
+        assertThat(userPeter).isNotNull();
+        assertThat(userPeter.getEmail()).isEqualTo(USER_EMAIL2);
+    }
+
+
+    @Test
+    @Transactional
+    public void givenTwoUsers_whenFindByNameUsr01_ThenUserUsr01() {
+        User usr01 = new User("usr01", LocalDate.now(), "usr01@baeldung.com", 1);
+        User usr02 = new User("usr02", LocalDate.now(), "usr02@baeldung.com", 1);
+
+        userRepository.save(usr01);
+        userRepository.save(usr02);
+
+        try (Stream<User> users = userRepository.findAllByName("usr01")) {
+            assertTrue(users.allMatch(usr -> usr.equals(usr01)));
+        }
+    }
+
+    @Test
+    @Transactional
+    public void givenTwoUsers_whenFindByNameUsr00_ThenNoUsers() {
+        User usr01 = new User("usr01", LocalDate.now(), "usr01@baeldung.com", 1);
+        User usr02 = new User("usr02", LocalDate.now(), "usr02@baeldung.com", 1);
+
+        userRepository.save(usr01);
+        userRepository.save(usr02);
+
+        try (Stream<User> users = userRepository.findAllByName("usr00")) {
+            assertEquals(0, users.count());
+        }
+    }
+
+    @Test
+    public void givenTwoUsers_whenFindUsersWithGmailAddress_ThenUserUsr02() {
+        User usr01 = new User("usr01", LocalDate.now(), "usr01@baeldung.com", 1);
+        User usr02 = new User("usr02", LocalDate.now(), "usr02@gmail.com", 1);
+
+        userRepository.save(usr01);
+        userRepository.save(usr02);
+
+        List<User> users = userRepository.findUsersWithGmailAddress();
+        assertEquals(1, users.size());
+        assertEquals(usr02, users.get(0));
+    }
+
+    @Test
+    @Transactional
+    public void givenTwoUsers_whenDeleteAllByCreationDateAfter_ThenOneUserRemains() {
+        User usr01 = new User("usr01", LocalDate.of(2018, 1, 1), "usr01@baeldung.com", 1);
+        User usr02 = new User("usr02", LocalDate.of(2018, 6, 1), "usr02@baeldung.com", 1);
+
+        userRepository.save(usr01);
+        userRepository.save(usr02);
+
+        userRepository.deleteAllByCreationDateAfter(LocalDate.of(2018, 5, 1));
+
+        List<User> users = userRepository.findAll();
+
+        assertEquals(1, users.size());
+        assertEquals(usr01, users.get(0));
+    }
+
+    @Test
+    public void givenTwoUsers_whenFindAllUsersByPredicates_ThenUserUsr01() {
+        User usr01 = new User("usr01", LocalDate.of(2018, 1, 1), "usr01@baeldung.com", 1);
+        User usr02 = new User("usr02", LocalDate.of(2018, 6, 1), "usr02@baeldung.org", 1);
+
+        userRepository.save(usr01);
+        userRepository.save(usr02);
+
+        List<Predicate<User>> predicates = new ArrayList<>();
+        predicates.add(usr -> usr.getCreationDate().isAfter(LocalDate.of(2017, 12, 31)));
+        predicates.add(usr -> usr.getEmail().endsWith(".com"));
+
+        List<User> users = userRepository.findAllUsersByPredicates(predicates);
+
+        assertEquals(1, users.size());
+        assertEquals(usr01, users.get(0));
+    }
+
+    @Test
+    @Transactional
+    public void givenTwoUsers_whenDeactivateUsersNotLoggedInSince_ThenUserUsr02Deactivated() {
+        User usr01 = new User("usr01", LocalDate.of(2018, 1, 1), "usr01@baeldung.com", 1);
+        usr01.setLastLoginDate(LocalDate.now());
+        User usr02 = new User("usr02", LocalDate.of(2018, 6, 1), "usr02@baeldung.org", 1);
+        usr02.setLastLoginDate(LocalDate.of(2018, 7, 20));
+
+        userRepository.save(usr01);
+        userRepository.save(usr02);
+
+        userRepository.deactivateUsersNotLoggedInSince(LocalDate.of(2018, 8, 1));
+
+        List<User> users = userRepository.findAllUsers(Sort.by(Sort.Order.asc("name")));
+        assertTrue(users.get(0).isActive());
+        assertFalse(users.get(1).isActive());
+    }
+
+    @Test
+    @Transactional
+    public void givenTwoUsers_whenDeleteDeactivatedUsers_ThenUserUsr02Deleted() {
+        User usr01 = new User("usr01", LocalDate.of(2018, 1, 1), "usr01@baeldung.com", 1);
+        usr01.setLastLoginDate(LocalDate.now());
+        User usr02 = new User("usr02", LocalDate.of(2018, 6, 1), "usr02@baeldung.com", 0);
+        usr02.setLastLoginDate(LocalDate.of(2018, 7, 20));
+        usr02.setActive(false);
+
+        userRepository.save(usr01);
+        userRepository.save(usr02);
+
+        int deletedUsersCount = userRepository.deleteDeactivatedUsers();
+
+        List<User> users = userRepository.findAll();
+        assertEquals(1, users.size());
+        assertEquals(usr01, users.get(0));
+        assertEquals(1, deletedUsersCount);
+    }
+
+    @Test
+    @Transactional
+    public void givenTwoUsers_whenAddDeletedColumn_ThenUsersHaveDeletedColumn() {
+        User usr01 = new User("usr01", LocalDate.of(2018, 1, 1), "usr01@baeldung.com", 1);
+        usr01.setLastLoginDate(LocalDate.now());
+        User usr02 = new User("usr02", LocalDate.of(2018, 6, 1), "usr02@baeldung.org", 1);
+        usr02.setLastLoginDate(LocalDate.of(2018, 7, 20));
+        usr02.setActive(false);
+
+        userRepository.save(usr01);
+        userRepository.save(usr02);
+
+        userRepository.addDeletedColumn();
+
+        Query nativeQuery = entityManager.createNativeQuery("select deleted from USERS where NAME = 'usr01'");
+        assertEquals(0, nativeQuery.getResultList().get(0));
+    }
+
+    @After
+    public void cleanUp() {
+        userRepository.deleteAll();
+    }
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/daos/UserRepositoryIntegrationTest.java

@@ -0,0 +1,37 @@
+package com.baeldung.boot.daos;
+
+import com.baeldung.boot.Application;
+import com.baeldung.boot.domain.User;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.time.LocalDate;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Created by adam.
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = Application.class)
+@DirtiesContext
+public class UserRepositoryIntegrationTest extends UserRepositoryCommon {
+
+    @Test
+    @Transactional
+    public void givenUsersInDBWhenUpdateStatusForNameModifyingQueryAnnotationNativeThenModifyMatchingUsers() {
+        userRepository.save(new User("SAMPLE", LocalDate.now(), USER_EMAIL, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE1", LocalDate.now(), USER_EMAIL2, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE", LocalDate.now(), USER_EMAIL3, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE3", LocalDate.now(), USER_EMAIL4, ACTIVE_STATUS));
+        userRepository.flush();
+
+        int updatedUsersSize = userRepository.updateUserSetStatusForNameNative(INACTIVE_STATUS, "SAMPLE");
+
+        assertThat(updatedUsersSize).isEqualTo(2);
+    }
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/daos/UserRepositoryTCAutoLiveTest.java

@@ -0,0 +1,43 @@
+package com.baeldung.boot.daos;
+
+import com.baeldung.boot.Application;
+import com.baeldung.boot.domain.User;
+import com.baeldung.util.BaeldungPostgresqlContainer;
+import org.junit.ClassRule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.transaction.annotation.Transactional;
+import org.testcontainers.containers.PostgreSQLContainer;
+
+import java.time.LocalDate;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Created by adam.
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = Application.class)
+@ActiveProfiles({"tc", "tc-auto"})
+public class UserRepositoryTCAutoLiveTest extends UserRepositoryCommon {
+
+    @ClassRule
+    public static PostgreSQLContainer postgreSQLContainer = BaeldungPostgresqlContainer.getInstance();
+
+    @Test
+    @Transactional
+    public void givenUsersInDB_WhenUpdateStatusForNameModifyingQueryAnnotationNativePostgres_ThenModifyMatchingUsers() {
+        userRepository.save(new User("SAMPLE", LocalDate.now(), USER_EMAIL, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE1", LocalDate.now(), USER_EMAIL2, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE", LocalDate.now(), USER_EMAIL3, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE3", LocalDate.now(), USER_EMAIL4, ACTIVE_STATUS));
+        userRepository.flush();
+
+        int updatedUsersSize = userRepository.updateUserSetStatusForNameNativePostgres(INACTIVE_STATUS, "SAMPLE");
+
+        assertThat(updatedUsersSize).isEqualTo(2);
+    }
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/daos/UserRepositoryTCLiveTest.java

@@ -0,0 +1,58 @@
+package com.baeldung.boot.daos;
+
+import com.baeldung.boot.Application;
+import com.baeldung.boot.domain.User;
+import org.junit.ClassRule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.util.TestPropertyValues;
+import org.springframework.context.ApplicationContextInitializer;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.transaction.annotation.Transactional;
+import org.testcontainers.containers.PostgreSQLContainer;
+
+import java.time.LocalDate;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = Application.class)
+@ActiveProfiles("tc")
+@ContextConfiguration(initializers = {UserRepositoryTCLiveTest.Initializer.class})
+public class UserRepositoryTCLiveTest extends UserRepositoryCommon {
+
+    @ClassRule
+    public static PostgreSQLContainer postgreSQLContainer = new PostgreSQLContainer("postgres:11.1")
+      .withDatabaseName("integration-tests-db")
+      .withUsername("sa")
+      .withPassword("sa");
+
+    @Test
+    @Transactional
+    public void givenUsersInDB_WhenUpdateStatusForNameModifyingQueryAnnotationNative_ThenModifyMatchingUsers() {
+        userRepository.save(new User("SAMPLE", LocalDate.now(), USER_EMAIL, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE1", LocalDate.now(), USER_EMAIL2, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE", LocalDate.now(), USER_EMAIL3, ACTIVE_STATUS));
+        userRepository.save(new User("SAMPLE3", LocalDate.now(), USER_EMAIL4, ACTIVE_STATUS));
+        userRepository.flush();
+
+        int updatedUsersSize = userRepository.updateUserSetStatusForNameNativePostgres(INACTIVE_STATUS, "SAMPLE");
+
+        assertThat(updatedUsersSize).isEqualTo(2);
+    }
+
+    static class Initializer
+      implements ApplicationContextInitializer<ConfigurableApplicationContext> {
+        public void initialize(ConfigurableApplicationContext configurableApplicationContext) {
+            TestPropertyValues.of(
+              "spring.datasource.url=" + postgreSQLContainer.getJdbcUrl(),
+              "spring.datasource.username=" + postgreSQLContainer.getUsername(),
+              "spring.datasource.password=" + postgreSQLContainer.getPassword()
+            ).applyTo(configurableApplicationContext.getEnvironment());
+        }
+    }
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/ddd/event/Aggregate2EventsIntegrationTest.java

@@ -0,0 +1,72 @@
+/**
+ *
+ */
+package com.baeldung.boot.ddd.event;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
+
+import com.baeldung.boot.ddd.event.Aggregate2;
+import com.baeldung.boot.ddd.event.Aggregate2Repository;
+import com.baeldung.boot.ddd.event.DomainEvent;
+
+@SpringJUnitConfig
+@SpringBootTest
+class Aggregate2EventsIntegrationTest {
+    @MockBean
+    private TestEventHandler eventHandler;
+    @Autowired
+    private Aggregate2Repository repository;
+
+    // @formatter:off
+    @DisplayName("given aggregate with @AfterDomainEventPublication,"
+        + " when do domain operation and save twice,"
+        + " then an event is published only for the first time")
+    // @formatter:on
+    @Test
+    void afterDomainEvents() {
+        // given
+        Aggregate2 aggregate = new Aggregate2();
+
+        // when
+        aggregate.domainOperation();
+        repository.save(aggregate);
+        repository.save(aggregate);
+
+        // then
+        verify(eventHandler, times(1)).handleEvent(any(DomainEvent.class));
+    }
+
+    @BeforeEach
+    void beforeEach() {
+        repository.deleteAll();
+    }
+
+    // @formatter:off
+    @DisplayName("given aggregate with @DomainEvents,"
+        + " when do domain operation and save,"
+        + " then an event is published")
+    // @formatter:on
+    @Test
+    void domainEvents() {
+        // given
+        Aggregate2 aggregate = new Aggregate2();
+
+        // when
+        aggregate.domainOperation();
+        repository.save(aggregate);
+
+        // then
+        verify(eventHandler, times(1)).handleEvent(any(DomainEvent.class));
+    }
+
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/ddd/event/Aggregate3EventsIntegrationTest.java

@@ -0,0 +1,67 @@
+/**
+ *
+ */
+package com.baeldung.boot.ddd.event;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
+
+import com.baeldung.boot.ddd.event.Aggregate3;
+import com.baeldung.boot.ddd.event.Aggregate3Repository;
+import com.baeldung.boot.ddd.event.DomainEvent;
+
+@SpringJUnitConfig
+@SpringBootTest
+class Aggregate3EventsIntegrationTest {
+
+    @MockBean
+    private TestEventHandler eventHandler;
+    @Autowired
+    private Aggregate3Repository repository;
+
+    // @formatter:off
+    @DisplayName("given aggregate extending AbstractAggregateRoot,"
+        + " when do domain operation and save twice,"
+        + " then an event is published only for the first time")
+    // @formatter:on
+    @Test
+    void afterDomainEvents() {
+        // given
+        Aggregate3 aggregate = new Aggregate3();
+
+        // when
+        aggregate.domainOperation();
+        repository.save(aggregate);
+        repository.save(aggregate);
+
+        // then
+        verify(eventHandler, times(1)).handleEvent(any(DomainEvent.class));
+    }
+
+    // @formatter:off
+    @DisplayName("given aggregate extending AbstractAggregateRoot,"
+        + " when do domain operation and save,"
+        + " then an event is published")
+    // @formatter:on
+    @Test
+    void domainEvents() {
+        // given
+        Aggregate3 aggregate = new Aggregate3();
+
+        // when
+        aggregate.domainOperation();
+        repository.save(aggregate);
+
+        // then
+        verify(eventHandler, times(1)).handleEvent(any(DomainEvent.class));
+    }
+
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/ddd/event/AggregateEventsIntegrationTest.java

@@ -0,0 +1,87 @@
+package com.baeldung.boot.ddd.event;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyZeroInteractions;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.context.annotation.Bean;
+import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
+
+import com.baeldung.boot.ddd.event.Aggregate;
+import com.baeldung.boot.ddd.event.AggregateRepository;
+import com.baeldung.boot.ddd.event.DomainEvent;
+import com.baeldung.boot.ddd.event.DomainService;
+
+@SpringJUnitConfig
+@SpringBootTest
+class AggregateEventsIntegrationTest {
+
+    @Autowired
+    private DomainService domainService;
+
+    @MockBean
+    private TestEventHandler eventHandler;
+    @Autowired
+    private ApplicationEventPublisher eventPublisher;
+    @Autowired
+    private AggregateRepository repository;
+
+    // @formatter:off
+    @DisplayName("given existing aggregate,"
+        + " when do domain operation directly on aggregate,"
+        + " then domain event is NOT published")
+    // @formatter:on
+    @Test
+    void aggregateEventsTest() {
+        Aggregate existingDomainEntity = new Aggregate(0, eventPublisher);
+        repository.save(existingDomainEntity);
+
+        // when
+        repository.findById(existingDomainEntity.getId())
+            .get()
+            .domainOperation();
+
+        // then
+        verifyZeroInteractions(eventHandler);
+    }
+
+    @BeforeEach
+    void beforeEach() {
+        repository.deleteAll();
+    }
+
+    // @formatter:off
+    @DisplayName("given existing aggregate,"
+        + " when do domain operation on service,"
+        + " then domain event is published")
+    // @formatter:on
+    @Test
+    void serviceEventsTest() {
+        Aggregate existingDomainEntity = new Aggregate(1, eventPublisher);
+        repository.save(existingDomainEntity);
+
+        // when
+        domainService.serviceDomainOperation(existingDomainEntity.getId());
+
+        // then
+        verify(eventHandler, times(1)).handleEvent(any(DomainEvent.class));
+    }
+
+    @TestConfiguration
+    public static class TestConfig {
+        @Bean
+        public DomainService domainService(AggregateRepository repository, ApplicationEventPublisher eventPublisher) {
+            return new DomainService(repository, eventPublisher);
+        }
+    }
+
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/ddd/event/TestEventHandler.java

@@ -0,0 +1,14 @@
+/**
+ *
+ */
+package com.baeldung.boot.ddd.event;
+
+import org.springframework.transaction.event.TransactionalEventListener;
+
+import com.baeldung.boot.ddd.event.DomainEvent;
+
+interface TestEventHandler {
+    @TransactionalEventListener
+    void handleEvent(DomainEvent event);
+
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/passenger/PassengerRepositoryIntegrationTest.java

@@ -0,0 +1,190 @@
+package com.baeldung.boot.passenger;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.data.domain.Example;
+import org.springframework.data.domain.ExampleMatcher;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Sort;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import com.baeldung.boot.passenger.Passenger;
+import com.baeldung.boot.passenger.PassengerRepository;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import java.util.List;
+import java.util.Optional;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.contains;
+import static org.hamcrest.core.IsNot.not;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+
+@DataJpaTest
+@RunWith(SpringRunner.class)
+public class PassengerRepositoryIntegrationTest {
+
+    @PersistenceContext
+    private EntityManager entityManager;
+    @Autowired
+    private PassengerRepository repository;
+
+    @Before
+    public void before() {
+        entityManager.persist(Passenger.from("Jill", "Smith", 50));
+        entityManager.persist(Passenger.from("Eve", "Jackson", 95));
+        entityManager.persist(Passenger.from("Fred", "Bloggs", 22));
+        entityManager.persist(Passenger.from("Ricki", "Bobbie", 36));
+        entityManager.persist(Passenger.from("Siya", "Kolisi", 85));
+    }
+
+    @Test
+    public void givenSeveralPassengersWhenOrderedBySeatNumberLimitedToThenThePassengerInTheFirstFilledSeatIsReturned() {
+        Passenger expected = Passenger.from("Fred", "Bloggs", 22);
+
+        List<Passenger> passengers = repository.findOrderedBySeatNumberLimitedTo(1);
+
+        assertEquals(1, passengers.size());
+
+        Passenger actual = passengers.get(0);
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void givenSeveralPassengersWhenFindFirstByOrderBySeatNumberAscThenThePassengerInTheFirstFilledSeatIsReturned() {
+        Passenger expected = Passenger.from("Fred", "Bloggs", 22);
+
+        Passenger actual = repository.findFirstByOrderBySeatNumberAsc();
+
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void givenSeveralPassengersWhenFindPageSortedByThenThePassengerInTheFirstFilledSeatIsReturned() {
+        Passenger expected = Passenger.from("Fred", "Bloggs", 22);
+
+        Page<Passenger> page = repository.findAll(PageRequest.of(0, 1,
+          Sort.by(Sort.Direction.ASC, "seatNumber")));
+
+        assertEquals(1, page.getContent().size());
+
+        Passenger actual = page.getContent().get(0);
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void givenPassengers_whenOrderedBySeatNumberAsc_thenCorrectOrder() {
+        Passenger fred = Passenger.from("Fred", "Bloggs", 22);
+        Passenger ricki = Passenger.from("Ricki", "Bobbie", 36);
+        Passenger jill = Passenger.from("Jill", "Smith", 50);
+        Passenger siya = Passenger.from("Siya", "Kolisi", 85);
+        Passenger eve = Passenger.from("Eve", "Jackson", 95);
+
+        List<Passenger> passengers = repository.findByOrderBySeatNumberAsc();
+
+        assertThat(passengers, contains(fred, ricki, jill, siya, eve));
+    }
+
+    @Test
+    public void givenPassengers_whenFindAllWithSortBySeatNumberAsc_thenCorrectOrder() {
+        Passenger fred = Passenger.from("Fred", "Bloggs", 22);
+        Passenger ricki = Passenger.from("Ricki", "Bobbie", 36);
+        Passenger jill = Passenger.from("Jill", "Smith", 50);
+        Passenger siya = Passenger.from("Siya", "Kolisi", 85);
+        Passenger eve = Passenger.from("Eve", "Jackson", 95);
+
+        List<Passenger> passengers = repository.findAll(Sort.by(Sort.Direction.ASC, "seatNumber"));
+
+        assertThat(passengers, contains(fred, ricki, jill, siya, eve));
+    }
+
+    @Test
+    public void givenPassengers_whenFindByExampleDefaultMatcher_thenExpectedReturned() {
+        Example<Passenger> example = Example.of(Passenger.from("Fred", "Bloggs", null));
+
+        Optional<Passenger> actual = repository.findOne(example);
+
+        assertTrue(actual.isPresent());
+        assertEquals(Passenger.from("Fred", "Bloggs", 22), actual.get());
+    }
+
+    @Test
+    public void givenPassengers_whenFindByExampleCaseInsensitiveMatcher_thenExpectedReturned() {
+        ExampleMatcher caseInsensitiveExampleMatcher = ExampleMatcher.matchingAll().withIgnoreCase();
+        Example<Passenger> example = Example.of(Passenger.from("fred", "bloggs", null),
+          caseInsensitiveExampleMatcher);
+
+        Optional<Passenger> actual = repository.findOne(example);
+
+        assertTrue(actual.isPresent());
+        assertEquals(Passenger.from("Fred", "Bloggs", 22), actual.get());
+    }
+
+    @Test
+    public void givenPassengers_whenFindByExampleCustomMatcher_thenExpectedReturned() {
+        Passenger jill = Passenger.from("Jill", "Smith", 50);
+        Passenger eve = Passenger.from("Eve", "Jackson", 95);
+        Passenger fred = Passenger.from("Fred", "Bloggs", 22);
+        Passenger siya = Passenger.from("Siya", "Kolisi", 85);
+        Passenger ricki = Passenger.from("Ricki", "Bobbie", 36);
+
+        ExampleMatcher customExampleMatcher = ExampleMatcher.matchingAny().withMatcher("firstName",
+          ExampleMatcher.GenericPropertyMatchers.contains().ignoreCase()).withMatcher("lastName",
+          ExampleMatcher.GenericPropertyMatchers.contains().ignoreCase());
+
+        Example<Passenger> example = Example.of(Passenger.from("e", "s", null),
+          customExampleMatcher);
+
+        List<Passenger> passengers = repository.findAll(example);
+
+        assertThat(passengers, contains(jill, eve, fred, siya));
+        assertThat(passengers, not(contains(ricki)));
+    }
+
+    @Test
+    public void givenPassengers_whenFindByIgnoringMatcher_thenExpectedReturned() {
+        Passenger jill = Passenger.from("Jill", "Smith", 50);
+        Passenger eve = Passenger.from("Eve", "Jackson", 95);
+        Passenger fred = Passenger.from("Fred", "Bloggs", 22);
+        Passenger siya = Passenger.from("Siya", "Kolisi", 85);
+        Passenger ricki = Passenger.from("Ricki", "Bobbie", 36);
+
+        ExampleMatcher ignoringExampleMatcher = ExampleMatcher.matchingAny().withMatcher("lastName",
+            ExampleMatcher.GenericPropertyMatchers.startsWith().ignoreCase()).withIgnorePaths("firstName", "seatNumber");
+
+        Example<Passenger> example = Example.of(Passenger.from(null, "b", null),
+            ignoringExampleMatcher);
+
+        List<Passenger> passengers = repository.findAll(example);
+
+        assertThat(passengers, contains(fred, ricki));
+        assertThat(passengers, not(contains(jill)));
+        assertThat(passengers, not(contains(eve)));
+        assertThat(passengers, not(contains(siya)));
+    }
+
+    @Test
+    public void givenPassengers_whenMatchingIgnoreCase_thenExpectedReturned() {
+        Passenger jill = Passenger.from("Jill", "Smith", 50);
+        Passenger eve = Passenger.from("Eve", "Jackson", 95);
+        Passenger fred = Passenger.from("Fred", "Bloggs", 22);
+        Passenger siya = Passenger.from("Siya", "Kolisi", 85);
+        Passenger ricki = Passenger.from("Ricki", "Bobbie", 36);
+
+        List<Passenger> passengers = repository.findByFirstNameIgnoreCase("FRED");
+
+        assertThat(passengers, contains(fred));
+        assertThat(passengers, not(contains(eve)));
+        assertThat(passengers, not(contains(siya)));
+        assertThat(passengers, not(contains(jill)));
+        assertThat(passengers, not(contains(ricki)));
+
+    }
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/services/AbstractServicePersistenceIntegrationTest.java

@@ -0,0 +1,252 @@
+package com.baeldung.boot.services;
+
+import com.baeldung.boot.domain.Foo;
+import com.baeldung.boot.services.IOperations;
+import com.baeldung.util.IDUtil;
+import org.hamcrest.Matchers;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.springframework.dao.DataAccessException;
+
+import java.io.Serializable;
+import java.util.List;
+
+import static org.apache.commons.lang3.RandomStringUtils.randomAlphabetic;
+import static org.hamcrest.Matchers.hasItem;
+import static org.hamcrest.Matchers.not;
+import static org.junit.Assert.*;
+
+public abstract class AbstractServicePersistenceIntegrationTest<T extends Serializable> {
+
+    // tests
+
+    // find - one
+
+    @Test
+    /**/public final void givenResourceDoesNotExist_whenResourceIsRetrieved_thenNoResourceIsReceived() {
+        // When
+        final Foo createdResource = getApi().findOne(IDUtil.randomPositiveLong());
+
+        // Then
+        assertNull(createdResource);
+    }
+
+    @Test
+    public void givenResourceExists_whenResourceIsRetrieved_thenNoExceptions() {
+        final Foo existingResource = persistNewEntity();
+        getApi().findOne(existingResource.getId());
+    }
+
+    @Test
+    public void givenResourceDoesNotExist_whenResourceIsRetrieved_thenNoExceptions() {
+        getApi().findOne(IDUtil.randomPositiveLong());
+    }
+
+    @Test
+    public void givenResourceExists_whenResourceIsRetrieved_thenTheResultIsNotNull() {
+        final Foo existingResource = persistNewEntity();
+        final Foo retrievedResource = getApi().findOne(existingResource.getId());
+        assertNotNull(retrievedResource);
+    }
+
+    @Test
+    public void givenResourceExists_whenResourceIsRetrieved_thenResourceIsRetrievedCorrectly() {
+        final Foo existingResource = persistNewEntity();
+        final Foo retrievedResource = getApi().findOne(existingResource.getId());
+        assertEquals(existingResource, retrievedResource);
+    }
+
+    // find - one - by name
+
+    // find - all
+
+    @Test
+    /**/public void whenAllResourcesAreRetrieved_thenNoExceptions() {
+        getApi().findAll();
+    }
+
+    @Test
+    /**/public void whenAllResourcesAreRetrieved_thenTheResultIsNotNull() {
+        final List<Foo> resources = getApi().findAll();
+
+        assertNotNull(resources);
+    }
+
+    @Test
+    /**/public void givenAtLeastOneResourceExists_whenAllResourcesAreRetrieved_thenRetrievedResourcesAreNotEmpty() {
+        persistNewEntity();
+
+        // When
+        final List<Foo> allResources = getApi().findAll();
+
+        // Then
+        assertThat(allResources, not(Matchers.<Foo> empty()));
+    }
+
+    @Test
+    /**/public void givenAnResourceExists_whenAllResourcesAreRetrieved_thenTheExistingResourceIsIndeedAmongThem() {
+        final Foo existingResource = persistNewEntity();
+
+        final List<Foo> resources = getApi().findAll();
+
+        assertThat(resources, hasItem(existingResource));
+    }
+
+    @Test
+    /**/public void whenAllResourcesAreRetrieved_thenResourcesHaveIds() {
+        persistNewEntity();
+
+        // When
+        final List<Foo> allResources = getApi().findAll();
+
+        // Then
+        for (final Foo resource : allResources) {
+            assertNotNull(resource.getId());
+        }
+    }
+
+    // create
+
+    @Test(expected = RuntimeException.class)
+    /**/public void whenNullResourceIsCreated_thenException() {
+        getApi().create(null);
+    }
+
+    @Test
+    /**/public void whenResourceIsCreated_thenNoExceptions() {
+        persistNewEntity();
+    }
+
+    @Test
+    /**/public void whenResourceIsCreated_thenResourceIsRetrievable() {
+        final Foo existingResource = persistNewEntity();
+
+        assertNotNull(getApi().findOne(existingResource.getId()));
+    }
+
+    @Test
+    /**/public void whenResourceIsCreated_thenSavedResourceIsEqualToOriginalResource() {
+        final Foo originalResource = createNewEntity();
+        final Foo savedResource = getApi().create(originalResource);
+
+        assertEquals(originalResource, savedResource);
+    }
+
+    @Test(expected = RuntimeException.class)
+    public void whenResourceWithFailedConstraintsIsCreated_thenException() {
+        final Foo invalidResource = createNewEntity();
+        invalidate(invalidResource);
+
+        getApi().create(invalidResource);
+    }
+
+    /**
+     * -- specific to the persistence engine
+     */
+    @Test(expected = DataAccessException.class)
+    @Ignore("Hibernate simply ignores the id silently and still saved (tracking this)")
+    public void whenResourceWithIdIsCreated_thenDataAccessException() {
+        final Foo resourceWithId = createNewEntity();
+        resourceWithId.setId(IDUtil.randomPositiveLong());
+
+        getApi().create(resourceWithId);
+    }
+
+    // update
+
+    @Test(expected = RuntimeException.class)
+    /**/public void whenNullResourceIsUpdated_thenException() {
+        getApi().update(null);
+    }
+
+    @Test
+    /**/public void givenResourceExists_whenResourceIsUpdated_thenNoExceptions() {
+        // Given
+        final Foo existingResource = persistNewEntity();
+
+        // When
+        getApi().update(existingResource);
+    }
+
+    /**
+     * - can also be the ConstraintViolationException which now occurs on the update operation will not be translated; as a consequence, it will be a TransactionSystemException
+     */
+    @Test(expected = RuntimeException.class)
+    public void whenResourceIsUpdatedWithFailedConstraints_thenException() {
+        final Foo existingResource = persistNewEntity();
+        invalidate(existingResource);
+
+        getApi().update(existingResource);
+    }
+
+    @Test
+    /**/public void givenResourceExists_whenResourceIsUpdated_thenUpdatesArePersisted() {
+        // Given
+        final Foo existingResource = persistNewEntity();
+
+        // When
+        change(existingResource);
+        getApi().update(existingResource);
+
+        final Foo updatedResource = getApi().findOne(existingResource.getId());
+
+        // Then
+        assertEquals(existingResource, updatedResource);
+    }
+
+    // delete
+
+    // @Test(expected = RuntimeException.class)
+    // public void givenResourceDoesNotExists_whenResourceIsDeleted_thenException() {
+    // // When
+    // getApi().delete(IDUtil.randomPositiveLong());
+    // }
+    //
+    // @Test(expected = RuntimeException.class)
+    // public void whenResourceIsDeletedByNegativeId_thenException() {
+    // // When
+    // getApi().delete(IDUtil.randomNegativeLong());
+    // }
+    //
+    // @Test
+    // public void givenResourceExists_whenResourceIsDeleted_thenNoExceptions() {
+    // // Given
+    // final Foo existingResource = persistNewEntity();
+    //
+    // // When
+    // getApi().delete(existingResource.getId());
+    // }
+    //
+    // @Test
+    // /**/public final void givenResourceExists_whenResourceIsDeleted_thenResourceNoLongerExists() {
+    // // Given
+    // final Foo existingResource = persistNewEntity();
+    //
+    // // When
+    // getApi().delete(existingResource.getId());
+    //
+    // // Then
+    // assertNull(getApi().findOne(existingResource.getId()));
+    // }
+
+    // template method
+
+    protected Foo createNewEntity() {
+        return new Foo(randomAlphabetic(6));
+    }
+
+    protected abstract IOperations<Foo> getApi();
+
+    private final void invalidate(final Foo entity) {
+        entity.setName(null);
+    }
+
+    private final void change(final Foo entity) {
+        entity.setName(randomAlphabetic(6));
+    }
+
+    protected Foo persistNewEntity() {
+        return getApi().create(createNewEntity());
+    }
+
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/services/FooServicePersistenceIntegrationTest.java

@@ -0,0 +1,80 @@
+package com.baeldung.boot.services;
+
+import com.baeldung.boot.Application;
+import com.baeldung.boot.config.PersistenceConfiguration;
+import com.baeldung.boot.domain.Foo;
+import com.baeldung.boot.services.IFooService;
+import com.baeldung.boot.services.IOperations;
+
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.dao.DataIntegrityViolationException;
+import org.springframework.dao.InvalidDataAccessApiUsageException;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.context.support.AnnotationConfigContextLoader;
+
+import static org.apache.commons.lang3.RandomStringUtils.randomAlphabetic;
+import static org.junit.Assert.assertNotNull;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes=Application.class)
+public class FooServicePersistenceIntegrationTest extends AbstractServicePersistenceIntegrationTest<Foo> {
+
+    @Autowired
+    private IFooService service;
+
+    // tests
+
+    @Test
+    public final void whenContextIsBootstrapped_thenNoExceptions() {
+        //
+    }
+
+    @Test
+    public final void whenEntityIsCreated_thenNoExceptions() {
+        service.create(new Foo(randomAlphabetic(6)));
+    }
+
+    @Test(expected = DataIntegrityViolationException.class)
+    public final void whenInvalidEntityIsCreated_thenDataException() {
+        service.create(new Foo());
+    }
+
+    @Test(expected = DataIntegrityViolationException.class)
+    public final void whenEntityWithLongNameIsCreated_thenDataException() {
+        service.create(new Foo(randomAlphabetic(2048)));
+    }
+
+    // custom Query method
+
+    @Test
+    public final void givenUsingCustomQuery_whenRetrievingEntity_thenFound() {
+        final String name = randomAlphabetic(6);
+        service.create(new Foo(name));
+
+        final Foo retrievedByName = service.retrieveByName(name);
+        assertNotNull(retrievedByName);
+    }
+
+    // work in progress
+
+    @Test(expected = InvalidDataAccessApiUsageException.class)
+    @Ignore("Right now, persist has saveOrUpdate semantics, so this will no longer fail")
+    public final void whenSameEntityIsCreatedTwice_thenDataException() {
+        final Foo entity = new Foo(randomAlphabetic(8));
+        service.create(entity);
+        service.create(entity);
+    }
+
+    // API
+
+    @Override
+    protected final IOperations<Foo> getApi() {
+        return service;
+    }
+
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/boot/services/SpringDataJPABarAuditIntegrationTest.java

@@ -0,0 +1,79 @@
+package com.baeldung.boot.services;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.security.test.context.support.WithMockUser;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.test.context.support.AnnotationConfigContextLoader;
+
+import com.baeldung.boot.Application;
+import com.baeldung.boot.config.PersistenceConfiguration;
+import com.baeldung.boot.domain.Bar;
+import com.baeldung.boot.services.IBarService;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes=Application.class)
+public class SpringDataJPABarAuditIntegrationTest {
+
+    private static Logger logger = LoggerFactory.getLogger(SpringDataJPABarAuditIntegrationTest.class);
+
+    @BeforeClass
+    public static void setUpBeforeClass() throws Exception {
+        logger.info("setUpBeforeClass()");
+    }
+
+    @AfterClass
+    public static void tearDownAfterClass() throws Exception {
+        logger.info("tearDownAfterClass()");
+    }
+
+    @Autowired
+    @Qualifier("barSpringDataJpaService")
+    private IBarService barService;
+
+    @Autowired
+    private EntityManagerFactory entityManagerFactory;
+
+    private EntityManager em;
+
+    @Before
+    public void setUp() throws Exception {
+        logger.info("setUp()");
+        em = entityManagerFactory.createEntityManager();
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        logger.info("tearDown()");
+        em.close();
+    }
+
+    @Test
+    @WithMockUser(username = "tutorialuser")
+    public final void whenBarsModified_thenBarsAudited() {
+        Bar bar = new Bar("BAR1");
+        barService.create(bar);
+        assertEquals(bar.getCreatedDate(), bar.getModifiedDate());
+        assertEquals("tutorialuser", bar.getCreatedBy(), bar.getModifiedBy());
+        bar.setName("BAR2");
+        bar = barService.update(bar);
+        assertTrue(bar.getCreatedDate() < bar.getModifiedDate());
+        assertEquals("tutorialuser", bar.getCreatedBy(), bar.getModifiedBy());
+    }
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/multipledb/JpaMultipleDBIntegrationTest.java

@@ -0,0 +1,96 @@
+package com.baeldung.multipledb;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import java.util.Collections;
+import java.util.Optional;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.dao.DataIntegrityViolationException;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.baeldung.multipledb.dao.product.ProductRepository;
+import com.baeldung.multipledb.dao.user.PossessionRepository;
+import com.baeldung.multipledb.dao.user.UserRepository;
+import com.baeldung.multipledb.model.product.ProductMultipleDB;
+import com.baeldung.multipledb.model.user.PossessionMultipleDB;
+import com.baeldung.multipledb.model.user.UserMultipleDB;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes=MultipleDbApplication.class)
+@EnableTransactionManagement
+public class JpaMultipleDBIntegrationTest {
+
+    @Autowired
+    private UserRepository userRepository;
+
+    @Autowired
+    private PossessionRepository possessionRepository;
+
+    @Autowired
+    private ProductRepository productRepository;
+
+    // tests
+
+    @Test
+    @Transactional("userTransactionManager")
+    public void whenCreatingUser_thenCreated() {
+        UserMultipleDB user = new UserMultipleDB();
+        user.setName("John");
+        user.setEmail("john@test.com");
+        user.setAge(20);
+        PossessionMultipleDB p = new PossessionMultipleDB("sample");
+        p = possessionRepository.save(p);
+        user.setPossessionList(Collections.singletonList(p));
+        user = userRepository.save(user);
+        final Optional<UserMultipleDB> result = userRepository.findById(user.getId());
+        assertTrue(result.isPresent());
+        System.out.println(result.get().getPossessionList());
+        assertEquals(1, result.get().getPossessionList().size());
+    }
+
+    @Test
+    @Transactional("userTransactionManager")
+    public void whenCreatingUsersWithSameEmail_thenRollback() {
+        UserMultipleDB user1 = new UserMultipleDB();
+        user1.setName("John");
+        user1.setEmail("john@test.com");
+        user1.setAge(20);
+        user1 = userRepository.save(user1);
+        assertTrue(userRepository.findById(user1.getId()).isPresent());
+
+        UserMultipleDB user2 = new UserMultipleDB();
+        user2.setName("Tom");
+        user2.setEmail("john@test.com");
+        user2.setAge(10);
+        try {
+            user2 = userRepository.save(user2);
+            userRepository.flush();
+            fail("DataIntegrityViolationException should be thrown!");
+        } catch (final DataIntegrityViolationException e) {
+            // Expected
+        } catch (final Exception e) {
+            fail("DataIntegrityViolationException should be thrown, instead got: " + e);
+        }
+    }
+
+    @Test
+    @Transactional("productTransactionManager")
+    public void whenCreatingProduct_thenCreated() {
+        ProductMultipleDB product = new ProductMultipleDB();
+        product.setName("Book");
+        product.setId(2);
+        product.setPrice(20);
+        product = productRepository.save(product);
+
+        assertTrue(productRepository.findById(product.getId()).isPresent());
+    }
+
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/multipledb/ProductRepositoryIntegrationTest.java

@@ -0,0 +1,144 @@
+package com.baeldung.multipledb;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.hasSize;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.baeldung.multipledb.PersistenceProductConfiguration;
+import com.baeldung.multipledb.dao.product.ProductRepository;
+import com.baeldung.multipledb.model.product.ProductMultipleDB;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes=MultipleDbApplication.class)
+@EnableTransactionManagement
+public class ProductRepositoryIntegrationTest {
+
+    @Autowired
+    private ProductRepository productRepository;
+
+    @Before
+    @Transactional("productTransactionManager")
+    public void setUp() {
+        productRepository.save(ProductMultipleDB.from(1001, "Book", 21));
+        productRepository.save(ProductMultipleDB.from(1002, "Coffee", 10));
+        productRepository.save(ProductMultipleDB.from(1003, "Jeans", 30));
+        productRepository.save(ProductMultipleDB.from(1004, "Shirt", 32));
+        productRepository.save(ProductMultipleDB.from(1005, "Bacon", 10));
+    }
+
+    @Test
+    public void whenRequestingFirstPageOfSizeTwo_ThenReturnFirstPage() {
+        Pageable pageRequest = PageRequest.of(0, 2);
+
+        Page<ProductMultipleDB> result = productRepository.findAll(pageRequest);
+
+        assertThat(result.getContent(), hasSize(2));
+        assertTrue(result.stream()
+            .map(ProductMultipleDB::getId)
+            .allMatch(id -> Arrays.asList(1001, 1002)
+                .contains(id)));
+    }
+
+    @Test
+    public void whenRequestingSecondPageOfSizeTwo_ThenReturnSecondPage() {
+        Pageable pageRequest = PageRequest.of(1, 2);
+
+        Page<ProductMultipleDB> result = productRepository.findAll(pageRequest);
+
+        assertThat(result.getContent(), hasSize(2));
+        assertTrue(result.stream()
+            .map(ProductMultipleDB::getId)
+            .allMatch(id -> Arrays.asList(1003, 1004)
+                .contains(id)));
+    }
+
+    @Test
+    public void whenRequestingLastPage_ThenReturnLastPageWithRemData() {
+        Pageable pageRequest = PageRequest.of(2, 2);
+
+        Page<ProductMultipleDB> result = productRepository.findAll(pageRequest);
+
+        assertThat(result.getContent(), hasSize(1));
+        assertTrue(result.stream()
+            .map(ProductMultipleDB::getId)
+            .allMatch(id -> Arrays.asList(1005)
+                .contains(id)));
+    }
+
+    @Test
+    public void whenSortingByNameAscAndPaging_ThenReturnSortedPagedResult() {
+        Pageable pageRequest = PageRequest.of(0, 3, Sort.by("name"));
+
+        Page<ProductMultipleDB> result = productRepository.findAll(pageRequest);
+
+        assertThat(result.getContent(), hasSize(3));
+        assertThat(result.getContent()
+            .stream()
+            .map(ProductMultipleDB::getId)
+            .collect(Collectors.toList()), equalTo(Arrays.asList(1005, 1001, 1002)));
+
+    }
+
+    @Test
+    public void whenSortingByPriceDescAndPaging_ThenReturnSortedPagedResult() {
+        Pageable pageRequest = PageRequest.of(0, 3, Sort.by("price")
+            .descending());
+
+        Page<ProductMultipleDB> result = productRepository.findAll(pageRequest);
+
+        assertThat(result.getContent(), hasSize(3));
+        assertThat(result.getContent()
+            .stream()
+            .map(ProductMultipleDB::getId)
+            .collect(Collectors.toList()), equalTo(Arrays.asList(1004, 1003, 1001)));
+
+    }
+
+    @Test
+    public void whenSortingByPriceDescAndNameAscAndPaging_ThenReturnSortedPagedResult() {
+        Pageable pageRequest = PageRequest.of(0, 5, Sort.by("price")
+            .descending()
+            .and(Sort.by("name")));
+
+        Page<ProductMultipleDB> result = productRepository.findAll(pageRequest);
+
+        assertThat(result.getContent(), hasSize(5));
+        assertThat(result.getContent()
+            .stream()
+            .map(ProductMultipleDB::getId)
+            .collect(Collectors.toList()), equalTo(Arrays.asList(1004, 1003, 1001, 1005, 1002)));
+
+    }
+
+    @Test
+    public void whenRequestingFirstPageOfSizeTwoUsingCustomMethod_ThenReturnFirstPage() {
+        Pageable pageRequest = PageRequest.of(0, 2);
+
+        List<ProductMultipleDB> result = productRepository.findAllByPrice(10, pageRequest);
+
+        assertThat(result, hasSize(2));
+        assertTrue(result.stream()
+            .map(ProductMultipleDB::getId)
+            .allMatch(id -> Arrays.asList(1002, 1005)
+                .contains(id)));
+    }
+}

persistence-modules/spring-data-jpa/src/test/java/com/baeldung/util/BaeldungPostgresqlContainer.java

@@ -0,0 +1,35 @@
+package com.baeldung.util;
+
+import org.testcontainers.containers.PostgreSQLContainer;
+
+public class BaeldungPostgresqlContainer extends PostgreSQLContainer<BaeldungPostgresqlContainer> {
+
+    private static final String IMAGE_VERSION = "postgres:11.1";
+
+    private static BaeldungPostgresqlContainer container;
+
+
+    private BaeldungPostgresqlContainer() {
+        super(IMAGE_VERSION);
+    }
+
+    public static BaeldungPostgresqlContainer getInstance() {
+        if (container == null) {
+            container = new BaeldungPostgresqlContainer();
+        }
+        return container;
+    }
+
+    @Override
+    public void start() {
+        super.start();
+        System.setProperty("DB_URL", container.getJdbcUrl());
+        System.setProperty("DB_USERNAME", container.getUsername());
+        System.setProperty("DB_PASSWORD", container.getPassword());
+    }
+
+    @Override
+    public void stop() {
+        //do nothing, JVM handles shut down
+    }
+}