Groovyc via Maven AntRun Example

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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.codehaus.groovy</groupId>
  <artifactId>groovyc-antrun-example</artifactId>
  <name>Groovyc Maven AntRun Example</name>
  <version>1.0-SNAPSHOT</version>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <groovyGroupId>org.codehaus.groovy</groovyGroupId>
    <groovyVersion>3.0.9</groovyVersion>
<!--     <groovyGroupId>org.apache.groovy</groovyGroupId> -->
<!--     <groovyVersion>4.0.0</groovyVersion> -->
  </properties>

  <dependencies>
    <dependency>
      <groupId>${groovyGroupId}</groupId>
      <artifactId>groovy</artifactId>
      <version>${groovyVersion}</version>
      <classifier>indy</classifier>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.9.0</version>
        <executions>
          <execution>
            <id>default-compile</id>
            <phase>none</phase>
          </execution>
          <execution>
            <id>default-testCompile</id>
            <phase>none</phase>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-antrun-plugin</artifactId>
        <version>3.0.0</version>
        <executions>
          <execution>
            <id>compile</id>
            <phase>compile</phase>
            <configuration>
              <target>
                <taskdef name="groovyc" classname="org.codehaus.groovy.ant.Groovyc">
                  <classpath refid="maven.compile.classpath" />
                </taskdef>
                <mkdir dir="${project.build.outputDirectory}" />
                <groovyc srcdir="${basedir}/src/main/groovy" destdir="${project.build.outputDirectory}"
                         targetBytecode="${maven.compiler.target}" indy="true" encoding="${project.build.sourceEncoding}">
                  <classpath refid="maven.compile.classpath" />
                  <src>
                    <pathelement path="${project.basedir}/src/main/java" />
                  </src>
                  <javac source="${maven.compiler.source}" target="${maven.compiler.target}" />
                </groovyc>
              </target>
            </configuration>
            <goals>
              <goal>run</goal>
            </goals>
          </execution>
          <execution>
            <id>test-compile</id>
            <phase>test-compile</phase>
            <configuration>
              <target>
                <taskdef name="groovyc" classname="org.codehaus.groovy.ant.Groovyc">
                  <classpath refid="maven.test.classpath" />
                </taskdef>
                <mkdir dir="${project.build.testOutputDirectory}" />
                <groovyc srcdir="${basedir}/src/test/groovy" destdir="${project.build.testOutputDirectory}"
                         targetBytecode="${maven.compiler.target}" indy="true" encoding="${project.build.sourceEncoding}">
                  <classpath refid="maven.test.classpath" />
                  <src>
                    <pathelement path="${project.basedir}/src/test/java" />
                  </src>
                  <javac source="${maven.compiler.source}" target="${maven.compiler.target}" />
                </groovyc>
              </target>
            </configuration>
            <goals>
              <goal>run</goal>
            </goals>
          </execution>
        </executions>
        <dependencies>
          <dependency>
            <groupId>org.codehaus.groovy</groupId>
            <artifactId>groovy-ant</artifactId>
            <version>${groovyVersion}</version>
            <classifier>indy</classifier>
          </dependency>
        </dependencies>
      </plugin>
    </plugins>
  </build>
</project>

I've updated the example to use a nested javac task instead of the normal compiler plugin (and changed the phase AntRun is bound to), this should allow circular dependencies.