Running an External Groovy Script in a Maven Build

You need to execute one or more groovy scripts in a Maven build.

Configure the execute goal of the GMaven plugin, reference the Groovy script in the source configuration for the execution. The following POM configures two executions of the execute goal referencing two scripts stored in ${basedir}/src/main/groovy.

<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.mhandbook</groupId>
  <artifactId>groovy-script-ex</artifactId>
  <packaging>jar</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>groovy-script-ex</name>
  <dependencies>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-model</artifactId>
      <version>2.2.0</version>
    </dependency>
  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.groovy.maven</groupId>
        <artifactId>gmaven-plugin</artifactId>
        <executions>
          <execution>
            <id>create-deps-file</id>
            <phase>process-classes</phase>
            <goals>
              <goal>execute</goal>
            </goals>
            <configuration>
              <source>${basedir}/src/main/groovy/CreateDeps.groovy</source>
            </configuration>
          </execution>
          <execution>
            <id>copy-the-source</id>
            <phase>prepare-package</phase>
            <goals>
              <goal>execute</goal>
            </goals>
            <configuration>
              <source>${basedir}/src/main/groovy/CopySource.groovy</source>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

The CreateDeps.groovy script creates a file named deps.txt in ${basedir}/target/classes which contains a list of direct project dependencies, and the CopySource.groovy script copies the source from ${basedir}/src/main/java to ${basedir}/target/classes.

def depFile = new File(project.build.outputDirectory,
              'deps.txt')
project.dependencies.each() {
  depFile.write("${it.groupId}:${it.artifactId}:${it.version}")
}

ant.copy(todir: project.build.outputDirectory ) {
  fileset(dir: project.build.sourceDirectory)
}