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Although it is possible to use Ant inside Maven to compile Groovy, the easiest method is to use GMaven, the Maven2 plugin for building Groovy projects. GMaven has the advantage that it will build projects where Java code references classes defined in Groovy.

Nevertheless, here's an example of a Maven2 build using the Ant plugin to compile a groovy project. Note that the Ant plugin is bound to the compile and test-compile phases of the build in the example below. It will be invoked during these phases and the contained tasks will be carried out which runs the Groovy compiler over the source and test directories. The resulting Java classes will coexist with and be treated like any standard Java classes compiled from Java source and will appear no different to the JRE, or the JUnit runtime.

This assumes you have a Maven project setup with "groovy" subfolders as peers to the java src and test subfolders. You can use the java/jar archetype to set this up then rename the java folders to groovy or keep the java folders and just create groovy peer folders. There exists, also a groovy plugin which has not been tested or used in production. After defining the build section as in the above example, you can invoke the typical Maven build phases normally. For example, "mvn test" will execute the test phase, compiling Groovy source and Groovy test source and finally executing the unit tests. If you run "mvn jar" it will execute the jar phase bundling up all of your compiled production classes into a jar after all of the unit tests pass. For more detail on Maven build phases consult the Maven2 documentation.

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