How to build an EAR project with EJB and WAR using Maven? - maven

Question

I tried to create EAR Project with EJB and WAR but I have some problem.
I created the main project from the Java EE 6 EAR Archetype:
<dependency>
<groupId>org.codehaus.mojo.archetypes</groupId>
<artifactId>ear-javaee6</artifactId>
<version>1.5</version>
</dependency>
Then I created the EJB module from the Java EE 6 EJB JAR Archetype:
<dependency>
<groupId>org.codehaus.mojo.archetypes</groupId>
<artifactId>ejb-javaee6</artifactId>
<version>1.5</version>
</dependency>
And then I created the second module from the Javax Faces WAR Archetype:
<dependency>
<groupId>javax.faces</groupId>
<artifactId>javax.faces-war-archetype</artifactId>
<version>2.2</version>
</dependency>
Then I added dependencies to main pom.xml:
<!-- Define the versions of your ear components here -->
<dependencies>
<dependency>
<groupId>QCforCC-main</groupId>
<artifactId>QCforCC-ejb</artifactId>
<version>1.0-SNAPSHOT</version>
<type>ejb</type>
</dependency>
<dependency>
<groupId>QCforCC-main</groupId>
<artifactId>QCforCC-war</artifactId>
<version>1.0-SNAPSHOT</version>
<type>war</type>
</dependency>
</dependencies>
And then I tried to build the project - using maven clean and instal .
But I have an error:
[ERROR] The projects in the reactor contain a cyclic reference: Edge between 'Vertex{label='QCforCC-main:QCforCC-war:1.0-SNAPSHOT'}' and 'Vertex{label='QCforCC-main:QCforCC-ejb:1.0-SNAPSHOT'}' introduces to cycle in the graph QCforCC-main:QCforCC-ejb:1.0-SNAPSHOT --> QCforCC-main:QCforCC-war:1.0-SNAPSHOT --> QCforCC-main:QCforCC-ejb:1.0-SNAPSHOT - [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectCycleException
Process finished with exit code 1
And in EAR pom.xml I have:
<modules>
<module>QCforCC-ejb</module>
<module>QCforCC-war</module>
</modules>
<packaging>pom</packaging>
But if I change <packaging>pom</packaging> to <packaging>ear</packaging>
IDEA show error in popup:
Some problems were encountered while processing the POMs:
[WARNING] 'build.plugins.plugin.(groupId:artifactId)' must be unique but found duplicate declaration of plugin org.apache.maven.plugins:maven-ear-plugin # line 41, column 21
[ERROR] 'packaging' with value 'ear' is invalid. Aggregator projects require 'pom' as packaging. # line 12, column 16

Answer 1

I highly suggest that you understand how multi-module builds work. The Sonatype book has a great chapter describing in great detail.
To build an EAR with an EJB and a WAR, you actually need three modules, for the EJB, WAR and EAR. The parent POM just holds everything together and has a packaging type of POM.
So the parent pom.xml should look like this:
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.sonatype.mavenbook.multi</groupId>
<artifactId>simple-parent</artifactId>
<packaging>pom</packaging>
<version>1.0</version>
<name>Multi Chapter Simple Parent Project</name>
<modules>
<module>ejb-module</module>
<module>war-module</module>
<module>ear-module</module>
</modules>
</project>
Then, each of the child POMs would look like this:
ejb-module/pom.xml:
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.sonatype.mavenbook.multi</groupId>
<artifactId>simple-parent</artifactId>
<version>1.0</version>
</parent>
<artifactId>ejb-module</artifactId>
<packaging>ejb</packaging>
</project>
war-module/pom.xml
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.sonatype.mavenbook.multi</groupId>
<artifactId>simple-parent</artifactId>
<version>1.0</version>
</parent>
<artifactId>war-module</artifactId>
<packaging>war</packaging>
<name>simple-webapp Maven Webapp</name>
<dependencies>
<dependency>
<groupId>org.sonatype.mavenbook.multi</groupId>
<artifactId>ejb-module</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
</project>
ear-module/pom.xml:
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.sonatype.mavenbook.multi</groupId>
<artifactId>simple-parent</artifactId>
<version>1.0</version>
</parent>
<artifactId>ear-module</artifactId>
<packaging>ear</packaging>
<name>EAR module</name>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-ear-plugin</artifactId>
<version>2.10.1</version>
<configuration>
<ejbModule>
<groupId>org.sonatype.mavenbook.multi</groupId>
<artifactId>ejb-module</artifactId>
<bundleFilename>ejb-module.jar</bundleFilename>
</ejbModule>
<webModule>
<groupId>org.sonatype.mavenbook.multi</groupId>
<artifactId>war-module</artifactId>
<contextRoot>/foo</contextRoot>
</webModule>
</configuration>
</plugin>
</plugins>
</build>
</project>

Answer 2

parent QCforCC-parent :
<artifactId>QCforCC-parent</artifactId>
<packaging>pom</packaging>
...
...
<modules>
<module>QCforCC-ear</module>
<module>QCforCC-ejb</module>
<module>QCforCC-war</module>
</modules>
QCforCC-ear :
<artifactId>QCforCC-ear</artifactId>
<packaging>ear</packaging>
...
...
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-ear-plugin</artifactId>
<configuration>
<version>5</version>
<displayName>XXXXXXXX</displayName>
<modules>
<webModule>
<moduleId>WebModule_XXX</moduleId>
<groupId>${project.groupId}</groupId>
<artifactId>>QCforCC-war</artifactId>
<contextRoot>XXXXXXXX</contextRoot>
</webModule>
<jarModule>
<groupId>${project.groupId}</groupId>
<artifactId>QCforCC-ejb</artifactId>
</jarModule>
</modules>
</configuration>
</plugin>
</plugins>