Part 1: Creating an empty multi module maven project structure

Posted on June 12, 2015 by

Enterprise projects will have multi maven modules.

Step 1: Create simple-app-parent is a package of type “pom”

mvn archetype:generate -DarchetypeGroupId=org.codehaus.mojo.archetypes -DarchetypeArtifactId=pom-root \
     -DarchetypeVersion=RELEASE  -DgroupId=com.mytutorial -DartifactId=simple-app-parent -Dpackage=pom

mvn archetype:generate -DarchetypeGroupId=org.codehaus.mojo.archetypes -DarchetypeArtifactId=pom-root \

-DarchetypeVersion=RELEASE -DgroupId=com.mytutorial -DartifactId=simple-app-parent -Dpackage=pom

press “Y” for all the questions.

Step 2: cd into your newly created root dir “simple-app-parent”

cd simple-app-parent

1	cd simple-app-parent

Step 3: Create a child module “simple-app-service”, which is a packaging type of “jar”

mvn archetype:generate -DarchetypeGroupId=org.apache.maven.archetypes -DarchetypeArtifactId=maven-archetype-quickstart \
    -DarchetypeVersion=RELEASE -DgroupId=com.mytutorial -DartifactId=simple-app-service -Dpackage=jar

mvn archetype:generate -DarchetypeGroupId=org.apache.maven.archetypes -DarchetypeArtifactId=maven-archetype-quickstart \

-DarchetypeVersion=RELEASE -DgroupId=com.mytutorial -DartifactId=simple-app-service -Dpackage=jar

Step 4: Create a child module “simple-app-endpoint”, which is a packaging type of “war”

mvn archetype:generate -DarchetypeGroupId=org.apache.maven.archetypes -DarchetypeArtifactId=maven-archetype-webapp -DarchetypeVersion=RELEASE \
    -DgroupId=com.mytutorial -DartifactId=simple-app-endpoint -Dpackage=war

mvn archetype:generate -DarchetypeGroupId=org.apache.maven.archetypes -DarchetypeArtifactId=maven-archetype-webapp -DarchetypeVersion=RELEASE \

-DgroupId=com.mytutorial -DartifactId=simple-app-endpoint -Dpackage=war

Take note of the different archetypes and packaging types used.

Importing into Eclipse IDE

Step 1: File –> Import –> Existing Maven Project. Select the “simple-app-parent”.

Step 2: You should now have a project structure as shown below.

maven multi-module project

Inspect the pom.xml files created. The simple-app-parent/pom.xml

<?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.mytutorial</groupId>
  <artifactId>simple-app-parent</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>pom</packaging>
  <name>simple-app-parent</name>
  <modules>
    <module>simple-app-service</module>
    <module>simple-app-endpoint</module>
  </modules>
</project>

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.mytutorial</groupId>

<artifactId>simple-app-parent</artifactId>

<version>1.0-SNAPSHOT</version>

<name>simple-app-parent</name>

<module>simple-app-service</module>

<module>simple-app-endpoint</module>

</modules>

</project>

The simple-app-service/pom.xml

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.mytutorial</groupId>
    <artifactId>simple-app-parent</artifactId>
    <version>1.0-SNAPSHOT</version>
  </parent>
  <groupId>com.mytutorial</groupId>
  <artifactId>simple-app-service</artifactId>
  <version>1.0-SNAPSHOT</version>
  <name>simple-app-service</name>
  <url>http://maven.apache.org</url>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

<?xml version="1.0"?>

<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

<groupId>com.mytutorial</groupId>

<artifactId>simple-app-parent</artifactId>

<version>1.0-SNAPSHOT</version>

</parent>

<groupId>com.mytutorial</groupId>

<artifactId>simple-app-service</artifactId>

<version>1.0-SNAPSHOT</version>

<name>simple-app-service</name>

<url>http://maven.apache.org</url>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

</properties>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

</dependency>

</dependencies>

</project>

The simple-app-endpoint/pom.xml

<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.mytutorial</groupId>
    <artifactId>simple-app-parent</artifactId>
    <version>1.0-SNAPSHOT</version>
  </parent>
  <groupId>com.mytutorial</groupId>
  <artifactId>simple-app-endpoint</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>
  <name>simple-app-endpoint Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <build>
    <finalName>simple-app-endpoint</finalName>
  </build>
</project>

<?xml version="1.0"?>

<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

<groupId>com.mytutorial</groupId>

<artifactId>simple-app-parent</artifactId>

<version>1.0-SNAPSHOT</version>

</parent>

<groupId>com.mytutorial</groupId>

<artifactId>simple-app-endpoint</artifactId>

<version>1.0-SNAPSHOT</version>

<name>simple-app-endpoint Maven Webapp</name>

<url>http://maven.apache.org</url>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

</dependency>

</dependencies>

<build>

<finalName>simple-app-endpoint</finalName>

</build>

</project>

Now you want the simple-app-endpoint.war to include simple-app-service-1.0-SNAPSHOT.jar to be included in WEB-INF/lib. So, you need to add the following dependency to your “simple-app-endpoint/pom.xml”

<dependency>
       <groupId>com.mytutorial</groupId>
       <artifactId>simple-app-service</artifactId>
      <version>1.0-SNAPSHOT</version>
</dependency>

<groupId>com.mytutorial</groupId>

<artifactId>simple-app-service</artifactId>

<version>1.0-SNAPSHOT</version>

</dependency>

After adding this, if you run “mvn clean install” you will get:

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Part 1: Creating an empty multi module maven project structure

Importing into Eclipse IDE

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