Ant xml example for FLEX/AS3 code PMD.

FLEX_PMD.xml

<project name="XXX_Flex_PMD"
		 default="flexPmdWithCustomRuleset">

	<description>
        Example Of Flex PMD
    </description>

	<property name="projecthome"
			  value="${basedir}"/>
	<property name="flexpmd.version"
			  value="1.2"/>
	<property name="flexpmd.dir"
			  value="${basedir}/libs/flexpmd"/>
	<property name="src.dir"
			  value="${basedir}/src"/>
	<property name="bin.dir"
			  value="${basedir}/target/pmd"/>

	<!--****************************************************
				FlexPMD
		*****************************************************-->

	<taskdef name="flexPmd"
			 classname="com.adobe.ac.pmd.ant.FlexPmdAntTask"
			 classpath="${flexpmd.dir}/flex-pmd-ant-task-${flexpmd.version}.jar">
		<classpath>
			<pathelement location="${flexpmd.dir}/flex-pmd-ruleset-api-${flexpmd.version}.jar"/>
			<pathelement location="${flexpmd.dir}/flex-pmd-ruleset-${flexpmd.version}.jar"/>
			<pathelement location="${flexpmd.dir}/flex-pmd-core-${flexpmd.version}.jar"/>
			<pathelement location="${flexpmd.dir}/as3-plugin-utils-${flexpmd.version}.jar"/>
			<pathelement location="${flexpmd.dir}/as3-parser-${flexpmd.version}.jar"/>
			<pathelement location="${flexpmd.dir}/pmd-4.2.5.jar"/>
			<pathelement location="${flexpmd.dir}/commons-lang-2.4.jar"/>
			<pathelement location="${flexpmd.dir}/flex-pmd-files-${flexpmd.version}.jar"/>
			<pathelement location="${flexpmd.dir}/as3-parser-api-${flexpmd.version}.jar"/>
			<pathelement location="${flexpmd.dir}/plexus-utils-1.0.2.jar"/>
		</classpath>
	</taskdef>


	<target name="flexPmdWithCustomRuleset">
		<flexPmd sourceDirectory="${src.dir}"
				 outputDirectory="${bin.dir}"
				 ruleSet="${flexpmd.dir}/pmd.xml"/>
	</target>

	<target name="flexPmdWithDefaultRuleset">
		<!-- Create directories needed for the pmd process -->
		<mkdir dir="${basedir}/avoidPMD" />
		<!-- Move avoid PMD files -->
		<move todir="${basedir}/avoidPMD/flexUnitTests">
		    <fileset dir="${src.dir}/flexUnitTests"/>
		 </move>
		<!--Wait file IO time-->
		<echo>Sleep 10 seconds for file IO</echo>
		<sleep seconds="10"/>
		<!-- Run PMD -->
		<flexPmd sourceDirectory="${src.dir}"
				 outputDirectory="${bin.dir}"
				 />
		<!-- Move back -->
		<move todir="${src.dir}/flexUnitTests">
			<fileset dir="${basedir}/avoidPMD/flexUnitTests"/>
		</move>
		<!-- Remove all directories created during the PMD process -->
		<delete dir="${basedir}/avoidPMD" />
		
	</target>
	
</project>

MORE FLEXPMD RULES: http://www.vanhulzenonline.nl/techblog/moreflexpmdrules/