diff --git a/persistence-modules/hibernate-exceptions/pom.xml b/persistence-modules/hibernate-exceptions/pom.xml new file mode 100644 index 0000000000..e5217e83bd --- /dev/null +++ b/persistence-modules/hibernate-exceptions/pom.xml @@ -0,0 +1,39 @@ + + + 4.0.0 + hibernate-exceptions + 0.0.1-SNAPSHOT + hibernate-exceptions + + + com.baeldung + persistence-modules + 1.0.0-SNAPSHOT + + + + + org.hsqldb + hsqldb + ${hsqldb.version} + + + org.hibernate + hibernate-core + ${hibernate.version} + + + javax.xml.bind + jaxb-api + ${jaxb.version} + + + + + 2.4.0 + 2.3.0 + 5.3.7.Final + + + diff --git a/persistence-modules/hibernate-exceptions/src/main/java/com/baeldung/hibernate/exception/lazyinitialization/HibernateUtil.java b/persistence-modules/hibernate-exceptions/src/main/java/com/baeldung/hibernate/exception/lazyinitialization/HibernateUtil.java new file mode 100644 index 0000000000..b84a512fd4 --- /dev/null +++ b/persistence-modules/hibernate-exceptions/src/main/java/com/baeldung/hibernate/exception/lazyinitialization/HibernateUtil.java @@ -0,0 +1,42 @@ +package com.baeldung.hibernate.exception.lazyinitialization; + +import java.util.Properties; + +import org.hibernate.SessionFactory; +import org.hibernate.boot.registry.StandardServiceRegistryBuilder; +import org.hibernate.cfg.Configuration; +import org.hibernate.cfg.Environment; +import org.hibernate.service.ServiceRegistry; + +import com.baeldung.hibernate.exception.lazyinitialization.entity.Role; +import com.baeldung.hibernate.exception.lazyinitialization.entity.User; + +public class HibernateUtil { + private static SessionFactory sessionFactory; + + public static SessionFactory getSessionFactory() { + if (sessionFactory == null) { + try { + Configuration configuration = new Configuration(); + Properties settings = new Properties(); + settings.put(Environment.DRIVER, "org.hsqldb.jdbcDriver"); + settings.put(Environment.URL, "jdbc:hsqldb:mem:userrole"); + settings.put(Environment.USER, "sa"); + settings.put(Environment.PASS, ""); + settings.put(Environment.DIALECT, "org.hibernate.dialect.HSQLDialect"); + settings.put(Environment.SHOW_SQL, "true"); + settings.put(Environment.HBM2DDL_AUTO, "update"); + configuration.setProperties(settings); + configuration.addAnnotatedClass(User.class); + configuration.addAnnotatedClass(Role.class); + + ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder() + .applySettings(configuration.getProperties()).build(); + sessionFactory = configuration.buildSessionFactory(serviceRegistry); + } catch (Exception e) { + e.printStackTrace(); + } + } + return sessionFactory; + } +} \ No newline at end of file diff --git a/persistence-modules/hibernate-exceptions/src/main/java/com/baeldung/hibernate/exception/lazyinitialization/entity/Role.java b/persistence-modules/hibernate-exceptions/src/main/java/com/baeldung/hibernate/exception/lazyinitialization/entity/Role.java new file mode 100644 index 0000000000..c15e674c52 --- /dev/null +++ b/persistence-modules/hibernate-exceptions/src/main/java/com/baeldung/hibernate/exception/lazyinitialization/entity/Role.java @@ -0,0 +1,45 @@ +package com.baeldung.hibernate.exception.lazyinitialization.entity; + +import javax.persistence.Column; +import javax.persistence.Entity; +import javax.persistence.GeneratedValue; +import javax.persistence.GenerationType; +import javax.persistence.Id; +import javax.persistence.Table; + +@Entity +@Table(name = "role") +public class Role { + @Id + @GeneratedValue(strategy = GenerationType.IDENTITY) + @Column(name = "id") + private int id; + + @Column(name = "role_name") + private String roleName; + + public Role() { + + } + + public Role(String roleName) { + this.roleName = roleName; + } + + public int getId() { + return id; + } + + public void setId(int id) { + this.id = id; + } + + public String getRoleName() { + return roleName; + } + + public void setRoleName(String roleName) { + this.roleName = roleName; + } + +} diff --git a/persistence-modules/hibernate-exceptions/src/main/java/com/baeldung/hibernate/exception/lazyinitialization/entity/User.java b/persistence-modules/hibernate-exceptions/src/main/java/com/baeldung/hibernate/exception/lazyinitialization/entity/User.java new file mode 100644 index 0000000000..5bd7e00801 --- /dev/null +++ b/persistence-modules/hibernate-exceptions/src/main/java/com/baeldung/hibernate/exception/lazyinitialization/entity/User.java @@ -0,0 +1,55 @@ +package com.baeldung.hibernate.exception.lazyinitialization.entity; + +import java.util.HashSet; +import java.util.Set; + +import javax.persistence.Column; +import javax.persistence.Entity; +import javax.persistence.GeneratedValue; +import javax.persistence.GenerationType; +import javax.persistence.Id; +import javax.persistence.JoinColumn; +import javax.persistence.OneToMany; +import javax.persistence.Table; + +@Entity +@Table(name = "user") +public class User { + + @Id + @GeneratedValue(strategy = GenerationType.IDENTITY) + @Column(name = "id") + private int id; + + @Column(name = "first_name") + private String firstName; + + @Column(name = "last_name") + private String lastName; + + @OneToMany + @JoinColumn(name = "user_id") + private Set roles = new HashSet<>(); + + public User() { + + } + + public User(String firstName, String lastName) { + this.firstName = firstName; + this.lastName = lastName; + } + + public int getId() { + return id; + } + + public Set getRoles() { + return roles; + } + + public void addRole(Role role) { + roles.add(role); + } + +} diff --git a/persistence-modules/hibernate-exceptions/src/test/java/com/baeldung/hibernate/exception/lazyinitialization/HibernateNoSessionUnitTest.java b/persistence-modules/hibernate-exceptions/src/test/java/com/baeldung/hibernate/exception/lazyinitialization/HibernateNoSessionUnitTest.java new file mode 100644 index 0000000000..672c438c88 --- /dev/null +++ b/persistence-modules/hibernate-exceptions/src/test/java/com/baeldung/hibernate/exception/lazyinitialization/HibernateNoSessionUnitTest.java @@ -0,0 +1,85 @@ +package com.baeldung.hibernate.exception.lazyinitialization; + +import org.hibernate.LazyInitializationException; +import org.hibernate.Session; +import org.hibernate.SessionFactory; +import org.junit.AfterClass; +import org.junit.Assert; +import org.junit.BeforeClass; +import org.junit.Rule; +import org.junit.Test; +import org.junit.rules.ExpectedException; + +import com.baeldung.hibernate.exception.lazyinitialization.entity.Role; +import com.baeldung.hibernate.exception.lazyinitialization.entity.User; + +public class HibernateNoSessionUnitTest { + + private static SessionFactory sessionFactory; + + @Rule + public ExpectedException thrown = ExpectedException.none(); + + @BeforeClass + public static void init() { + sessionFactory = HibernateUtil.getSessionFactory(); + } + + @Test + public void whenAccessUserRolesInsideSession_thenSuccess() { + + User detachedUser = createUserWithRoles(); + + Session session = sessionFactory.openSession(); + session.beginTransaction(); + + User persistentUser = session.find(User.class, detachedUser.getId()); + + Assert.assertEquals(2, persistentUser.getRoles().size()); + + session.getTransaction().commit(); + session.close(); + } + + @Test + public void whenAccessUserRolesOutsideSession_thenThrownException() { + + User detachedUser = createUserWithRoles(); + + Session session = sessionFactory.openSession(); + session.beginTransaction(); + + User persistentUser = session.find(User.class, detachedUser.getId()); + + session.getTransaction().commit(); + session.close(); + + thrown.expect(LazyInitializationException.class); + System.out.println(persistentUser.getRoles().size()); + } + + private User createUserWithRoles() { + + Role admin = new Role("Admin"); + Role dba = new Role("DBA"); + + User user = new User("Bob", "Smith"); + + user.addRole(admin); + user.addRole(dba); + + Session session = sessionFactory.openSession(); + session.beginTransaction(); + user.getRoles().forEach(role -> session.save(role)); + session.save(user); + session.getTransaction().commit(); + session.close(); + + return user; + } + + @AfterClass + public static void cleanUp() { + sessionFactory.close(); + } +}