How to create multi-module maven project in eclipse

Learn how to create a multi-module maven project in eclipse IDE. In this maven tutorial, we will learn to create nested maven projects in Eclipse.

Table Of Contents

1. Multi-module Project Structure
2. FAQs
- 2.1. GroupId is duplicate of parent groupId
- 2.2. Artifact is not a dependency of the project

1. Multi-module Project Structure

Let’s create a maven project having modules packaging ear, war and jar types. We are creating the structure of an enterprise application where the application will be deployed to applications servers (e.g. Weblogic, WebSphere) as an EAR (Enterprise Application aRchive) file.

This EAR will contain one (or many) WAR (Web Application Resource) files and each war will include the service project which has common code to all war files.

1.1. Create Parent Project with Packaging type ‘pom’

Create a new maven project in eclipse. Set it’s packaging type to ‘pom‘.

1.2. Create Child Project with EAR Packaging

Create a new maven module in the parent project. Change its packaging type to 'ear'. This module can have maven ear plugin which will ultimately build the ear file to be deployed on servers.

1.3. Create Projects with Packaging type ‘war’ and ‘jar’

Similar to ear module, create two more modules for war file and service jar file. Change their packaging respectively and add maven plugins.

1.4. Final Result

Now observe the final project structure in eclipse and verify the pom.xml files for all projects.

<?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
        https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.howtodoinjava.app</groupId>
	<artifactId>HelloWorldApp</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>pom</packaging>

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

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<maven.compiler.source>1.8</maven.compiler.source>
		<maven.compiler.target>1.8</maven.compiler.target>
	</properties>

	<modules>
		<module>web</module>
		<module>service</module>
		<module>ear</module>
	</modules>
</project>

<?xml version="1.0"?>
<project
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://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.howtodoinjava.app</groupId>
		<artifactId>HelloWorldApp</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>
	<artifactId>ear</artifactId>
	<name>ear</name>
	<packaging>ear</packaging>
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>
	<dependencies>
		<dependency>
			<groupId>com.howtodoinjava.app</groupId>
			<artifactId>web</artifactId>
			<version>0.0.1-SNAPSHOT</version>
			<type>war</type>
		</dependency>
	</dependencies>
	<build>
		<pluginManagement>
		<plugins>
		<plugin>
			<groupId>org.apache.maven.plugins</groupId>
			<artifactId>maven-ear-plugin</artifactId>
			<version>3.0.1</version>
			<configuration>
				<modules>
					<webModule>
						<groupId>com.howtodoinjava.app</groupId>
						<artifactId>web</artifactId>
						<uri>web-0.0.1-SNAPSHOT.war</uri>
						<!-- Set custom context root -->
						<contextRoot>/application</contextRoot>
					</webModule>
				</modules>
			</configuration>
		</plugin>
		</plugins>
		</pluginManagement>
	</build>
</project>

<?xml version="1.0"?>
<project
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://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.howtodoinjava.app</groupId>
		<artifactId>HelloWorldApp</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>
	<artifactId>ear</artifactId>
	<name>ear</name>
	<packaging>ear</packaging>
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>
	<dependencies>
		<dependency>
			<groupId>com.howtodoinjava.app</groupId>
			<artifactId>web</artifactId>
			<version>0.0.1-SNAPSHOT</version>
			<type>war</type>
		</dependency>
	</dependencies>
	<build>
		<pluginManagement>
		<plugins>
		<plugin>
			<groupId>org.apache.maven.plugins</groupId>
			<artifactId>maven-ear-plugin</artifactId>
			<version>3.0.1</version>
			<configuration>
				<modules>
					<webModule>
						<groupId>com.howtodoinjava.app</groupId>
						<artifactId>web</artifactId>
						<uri>web-0.0.1-SNAPSHOT.war</uri>
						<!-- Set custom context root -->
						<contextRoot>/application</contextRoot>
					</webModule>
				</modules>
			</configuration>
		</plugin>
		</plugins>
		</pluginManagement>
	</build>
</project>

<?xml version="1.0"?>
<project
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://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.howtodoinjava.app</groupId>
		<artifactId>HelloWorldApp</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>
	<groupId>com.howtodoinjava.app</groupId>
	<artifactId>service</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>service</name>
	<url>http://maven.apache.org</url>
	<packaging>jar</packaging>
	<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>

To build the projects, run $mvn clean install command from the console.

E:\devsetup\workspacetemp\HelloWorldApp>mvn clean install
 
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] HelloWorldApp                                                      [pom]
[INFO] service                                                            [jar]
[INFO] web                                                                [war]
[INFO] ear                                                                [ear]
[INFO]
...
...
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ service ---
[WARNING] JAR will be empty - no content was marked for inclusion!
[INFO] Building jar: E:\devsetup\workspacetemp\HelloWorldApp\service\target\service-0.0.1-SNAPSHOT.jar
[INFO]
...
...
[INFO] Packaging webapp
[INFO] Assembling webapp [web] in [E:\devsetup\workspacetemp\HelloWorldApp\web\target\web-0.0.1-SNAPSHOT]
[INFO] Processing war project
[INFO] Copying webapp resources [E:\devsetup\workspacetemp\HelloWorldApp\web\src\main\webapp]
[INFO] Webapp assembled in [47 msecs]
[INFO] Building war: E:\devsetup\workspacetemp\HelloWorldApp\web\target\web-0.0.1-SNAPSHOT.war
[INFO] WEB-INF\web.xml already added, skipping
[INFO]
...
...
[INFO]
[INFO] --- maven-ear-plugin:3.0.1:ear (default-ear) @ ear ---
[INFO] Copying artifact [war:com.howtodoinjava.app:web:0.0.1-SNAPSHOT] to [web-0.0.1-SNAPSHOT.war]
[INFO] Copy ear sources to E:\devsetup\workspacetemp\HelloWorldApp\ear\target\ear-0.0.1-SNAPSHOT
[INFO] Building jar: E:\devsetup\workspacetemp\HelloWorldApp\ear\target\ear-0.0.1-SNAPSHOT.ear
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] HelloWorldApp 0.0.1-SNAPSHOT ....................... SUCCESS [  0.328 s]
[INFO] service ............................................ SUCCESS [  0.839 s]
[INFO] web ................................................ SUCCESS [  0.838 s]
[INFO] ear 0.0.1-SNAPSHOT ................................. SUCCESS [  0.588 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.749 s
[INFO] Finished at: 2018-11-18T15:04:52+05:30
[INFO] ------------------------------------------------------------------------

The build generates an ear file with name ear-0.0.1-SNAPSHOT.ear.

Feel free to change the name of projects and generated packages as per your need.

2. FAQs

2.1. GroupId is duplicate of parent groupId

Maven child projects inherit properties from the parent project. If either group id or version id is same as parent project for any maven module/project, then we can simply remove this entry.

2.2. Artifact is not a dependency of the project

We may face this error when have added the module dependency (war) without specifying the type attribute.

Drop me your question related to creating a multi-module maven project in eclipse IDE.

Happy Learning !!

Maven Multi-Module Project using Eclipse

1. Multi-module Project Structure

1.1. Create Parent Project with Packaging type ‘pom’

1.2. Create Child Project with EAR Packaging

1.3. Create Projects with Packaging type ‘war’ and ‘jar’

1.4. Final Result

2. FAQs

2.1. GroupId is duplicate of parent groupId

2.2. Artifact is not a dependency of the project

About Us

Tutorial Series

Meta Links

Our Blogs

1. Multi-module Project Structure

1.1. Create Parent Project with Packaging type ‘pom’

1.2. Create Child Project with EAR Packaging

1.3. Create Projects with Packaging type ‘war’ and ‘jar’

1.4. Final Result

2. FAQs

2.1. GroupId is duplicate of parent groupId

2.2. Artifact is not a dependency of the project

Discover More: Related Articles and Resources

About Us

Tutorial Series

Meta Links

Our Blogs