Run Groovy from Maven

<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/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>org.codehaus.mojo</groupId>
	<artifactId>my-project</artifactId>
	<version>1.0</version>

	<build>
		<plugins>
			<plugin>
				<groupId>org.codehaus.gmaven</groupId>
				<artifactId>gmaven-plugin</artifactId>
				<configuration>
					<source>
						println "Hi"
					</source>
				</configuration>
			</plugin>
		</plugins>
	</build>

</project>

execute as: mvn groovy:execute