build-checkstyle.xml

<project>
  <property name="checkstyle.version" value="all-5.0-beta2"/>
  <property name="checkstyle.output.dir" value="${build.dir}/checkstyle-results"/>

  <!-- Checkstyle task definition -->
  <taskdef resource="checkstyletask.properties" classpath="${buildtools.dir}/checkstyle-${checkstyle.version}.jar"/>

  <target name="checkstyle" depends="_run-checkstyle, _checkstyle-warnings" description="Run Checkstyle on all modules"/>

  <target name="_init-checkstyle">
    <mkdir dir="${checkstyle.output.dir}"/>
  </target>

  <target name="_run-checkstyle" depends="compile, _init-checkstyle, _generate-checkstyle-fileset">
    <checkstyle config="${buildtools.dir}/checkstyle.xml" classpathref="path.common" failOnViolation="false" failureProperty="checkstyle.failure">
      <fileset refid="checkstyle.files"/>
      <formatter type="xml" toFile="${checkstyle.output.dir}/checkstyle_errors.xml"/>
    </checkstyle>
    <xslt in="${checkstyle.output.dir}/checkstyle_errors.xml" out="${checkstyle.output.dir}/checkstyle_errors.html" style="${buildtools.dir}/checkstyle-noframes-sorted.xsl"/>
  </target>

  <target name="_checkstyle-warnings" if="checkstyle.failure">
    <echo message="Checkstyle warnings found"/>
  </target>

  <target name="_generate-checkstyle-fileset">
    <script language="javascript">
      <![CDATA[
        importClass(org.apache.tools.ant.types.Path);
        importClass(org.apache.tools.ant.types.FileSet);
        importClass(java.lang.System);
        importClass(java.io.File);
        var modules = project.getProperty("modules").split(",");
        var fileset = new FileSet();
        fileset.setDir(new File(project.getProperty("modules.dir")));
        for (var i = 0; i < modules.length; ++i) {
          fileset.setIncludes(modules[i] + "/src/**/*.java");
        }
        project.addReference("checkstyle.files", fileset);
        project.setProjectReference(fileset);
      ]]>
    </script>
  </target>
</project>