What do you mean by "it uses either ..."? My impression of Maven is that it is a souped-up Ant, so you can start your own tasks in whichever way you like. Both PMD and Checkstyle have their own Ant task, and can alternatively be started using the <java> task. Does Maven not allow you to run several tasks of your own choice in succession, or does it support neither custom Ant tasks nor the <java> task?
Ping & DNS - updated with new look and Ping home screen widget