The AstCreator is available as a normal plugin from Maven Central now! Use the following snippet in you pom.xml to enable it.
<plugin>
<groupId>org.overturetool.astcreator</groupId>
<artifactId>astcreator-plugin</artifactId>
<version>1.6.8</version>
<artifactId>root</artifactId>
<executions>
<execution>
<id>java</id>
<phase>generate-sources</phase>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
<configuration>
<ast>overtureII.astv2</ast>
<suppressWarnings>true</suppressWarnings>
</configuration>
</plugin>