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

core-java-modules/multimodulemavenproject/README.md

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+## Relevant Articles
+
+- [Multi-Module Maven Application with Java Modules](https://www.baeldung.com/maven-multi-module-project-java-jpms)

core-java-modules/multimodulemavenproject/daomodule/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.daomodule</groupId>
+    <artifactId>daomodule</artifactId>
+    <version>1.0</version>
+    <packaging>jar</packaging>
+    
+    <parent>
+        <groupId>com.baeldung.multimodulemavenproject</groupId>
+        <artifactId>multimodulemavenproject</artifactId>
+        <version>1.0</version>
+    </parent>
+    
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+    
+    <properties>
+        <maven.compiler.source>9</maven.compiler.source>
+        <maven.compiler.target>9</maven.compiler.target>
+    </properties>
+</project>

core-java-modules/multimodulemavenproject/daomodule/src/main/java/com/baeldung/daomodule/Dao.java

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+package com.baeldung.daomodule;
+import java.util.List;
+import java.util.Optional;
+
+public interface Dao<T> {
+
+    Optional<T> findById(int id);
+
+    List<T> findAll();
+
+}

core-java-modules/multimodulemavenproject/daomodule/src/main/java/module-info.java

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+module com.baeldung.daomodule {
+    exports com.baeldung.daomodule;
+}

core-java-modules/multimodulemavenproject/entitymodule/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.entitymodule</groupId>
+    <artifactId>entitymodule</artifactId>
+    <version>1.0</version>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.multimodulemavenproject</groupId>
+        <artifactId>multimodulemavenproject</artifactId>
+        <version>1.0</version>
+    </parent>
+    
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+    
+     <properties>
+        <maven.compiler.source>9</maven.compiler.source>
+        <maven.compiler.target>9</maven.compiler.target>
+    </properties>
+    
+</project>

core-java-modules/multimodulemavenproject/entitymodule/src/main/java/com/baeldung/entitymodule/User.java

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+package com.baeldung.entitymodule;
+
+public class User {
+
+    private final String name;
+
+    public User(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public String toString() {
+        return "User{" + "name=" + name + '}';
+    }
+}

core-java-modules/multimodulemavenproject/entitymodule/src/main/java/module-info.java

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+module com.baeldung.entitymodule {
+    exports com.baeldung.entitymodule;
+}

core-java-modules/multimodulemavenproject/mainappmodule/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.mainappmodule</groupId>
+    <artifactId>mainappmodule</artifactId>
+    <version>1.0</version>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.multimodulemavenproject</groupId>
+        <artifactId>multimodulemavenproject</artifactId>
+        <version>1.0</version>
+    </parent>
+    
+    <dependencies>
+        <dependency>
+            <groupId>com.baeldung.entitymodule</groupId>
+            <artifactId>entitymodule</artifactId>
+            <version>1.0</version>
+        </dependency>
+        <dependency>
+            <groupId>com.baeldung.daomodule</groupId>
+            <artifactId>daomodule</artifactId>
+            <version>1.0</version>
+        </dependency>
+        <dependency>
+            <groupId>com.baeldung.userdaomodule</groupId>
+            <artifactId>userdaomodule</artifactId>
+            <version>1.0</version>
+        </dependency>
+    </dependencies>
+    
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+    
+    <properties>
+        <maven.compiler.source>9</maven.compiler.source>
+        <maven.compiler.target>9</maven.compiler.target>
+    </properties>
+</project>

core-java-modules/multimodulemavenproject/mainappmodule/src/main/java/com/baeldung/mainappmodule/Application.java

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+package com.baeldung.mainappmodule;
+
+import com.baeldung.daomodule.Dao;
+import com.baeldung.entitymodule.User;
+import com.baeldung.userdaomodule.UserDao;
+import java.util.HashMap;
+import java.util.Map;
+
+public class Application {
+    
+    public static void main(String args[]) {
+        Map<Integer, User> users = new HashMap<>();
+        users.put(1, new User("Julie"));
+        users.put(2, new User("David"));
+        Dao userDao = new UserDao(users);
+        userDao.findAll().forEach(System.out::println);
+    }
+    
+}

core-java-modules/multimodulemavenproject/mainappmodule/src/main/java/module-info.java

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+module com.baeldung.mainppmodule {
+    
+    requires com.baeldung.entitymodule;
+    requires com.baeldung.daomodule;
+    requires com.baeldung.userdaomodule;
+    uses com.baeldung.userdaomodule.UserDao;
+    
+}

core-java-modules/multimodulemavenproject/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.multimodulemavenproject</groupId>
+    <artifactId>multimodulemavenproject</artifactId>
+    <version>1.0</version>
+    <packaging>pom</packaging>
+    <name>multimodulemavenproject</name>
+    
+    <parent>
+        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../../</relativePath>
+    </parent>
+    
+    <modules>
+        <module>entitymodule</module>
+        <module>daomodule</module>
+        <module>userdaomodule</module>
+        <module>mainappmodule</module>
+    </modules>
+    
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>junit</groupId>
+                <artifactId>junit</artifactId>
+                <version>${junit.version}</version>
+                <scope>test</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.assertj</groupId>
+                <artifactId>assertj-core</artifactId>
+                <version>${assertj-core.version}</version>
+                <scope>test</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+    
+    <build>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-compiler-plugin</artifactId>
+                    <version>3.8.0</version>
+                    <configuration>
+                        <configuration>
+                            <source>1.9</source>
+                            <target>1.9</target>
+                        </configuration>
+                    </configuration>
+                </plugin>
+            </plugins>
+        </pluginManagement>
+    </build>
+    
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <assertj-core.version>3.12.2</assertj-core.version>
+    </properties>
+</project>

core-java-modules/multimodulemavenproject/userdaomodule/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.userdaomodule</groupId>
+    <artifactId>userdaomodule</artifactId>
+    <version>1.0</version>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.multimodulemavenproject</groupId>
+        <artifactId>multimodulemavenproject</artifactId>
+        <version>1.0</version>
+    </parent>
+    
+    <dependencies>
+        <dependency>
+            <groupId>com.baeldung.entitymodule</groupId>
+            <artifactId>entitymodule</artifactId>
+            <version>1.0</version>
+        </dependency>
+        <dependency>
+            <groupId>com.baeldung.daomodule</groupId>
+            <artifactId>daomodule</artifactId>
+            <version>1.0</version>
+        </dependency>
+    </dependencies>
+    
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+    
+    <properties>
+        <maven.compiler.source>9</maven.compiler.source>
+        <maven.compiler.target>9</maven.compiler.target>
+    </properties>
+    
+</project>

core-java-modules/multimodulemavenproject/userdaomodule/src/main/java/com/baeldung/userdaomodule/UserDao.java

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+package com.baeldung.userdaomodule;
+
+import com.baeldung.daomodule.Dao;
+import com.baeldung.entitymodule.User;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+public class UserDao implements Dao<User> {
+
+    private final Map<Integer, User> users;
+
+    public UserDao() {
+        users = new HashMap<>();
+    }
+
+    public UserDao(Map<Integer, User> users) {
+        this.users = users;
+    }
+
+    @Override
+    public List<User> findAll() {
+        return new ArrayList<>(users.values());
+    }
+
+    @Override
+    public Optional<User> findById(int id) {
+        return Optional.ofNullable(users.get(id));
+    }
+}

core-java-modules/multimodulemavenproject/userdaomodule/src/main/java/module-info.java

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+module com.baeldung.userdaomodule {
+    requires com.baeldung.entitymodule;
+    requires com.baeldung.daomodule;
+    provides com.baeldung.daomodule.Dao with com.baeldung.userdaomodule.UserDao;
+    exports com.baeldung.userdaomodule;
+}