How do I set JDK version for gmaven plugin?

Question

Is it possible to force the gmaven plugin to use a different JDK than the one specified in JAVA_HOME? We need to build a specific project using Java 7, but most developers will have JAVA_HOME set to a Java 6 install as all our other projects are still on Java 6.

The error message we get is:

[ERROR] Failed to execute goal org.codehaus.gmaven:gmaven-plugin:1.4:generateStubs (default) on   project XYZ: Execution default of goal org.codehaus.gmaven:gmaven-plugin:1.4:generateStubs failed: An API incompatibility was encountered while executing org.codehaus.gmaven:gmaven-plugin:1.4:generateStubs: java.lang.UnsupportedClassVersionError: <snip> : Unsupported major.minor version 51.0

Thanks!

Answer 1

The Maven Enforcer plugin is an easy way to require a specific JDK version.

Answer 2

Example configuration from maven-compiler-plugin

<project>
  [...]
  <build>
    [...]
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>2.5.1</version>
        <configuration>
          <source>1.6</source>
          <target>1.6</target>
        </configuration>
      </plugin>
    </plugins>
    [...]
  </build>
  [...]
</project>

The maven by default uses Java 1.4, not the Java set in the JAVA_HOME variable.

Answer 3

You can set an alternate jdk in the maven-complier-plugin configuration. See here

Answer 4

you can specify JAVA_HOME for maven task in ide or bat/sh file for example Intellige Idea

and no need to change system environment variables