For me I found the easiest way was to set up remote debug and just connect to the app remotely using Eclipse. If the app is not being deployed it suggests that your app is not correctly configured with the required dependencies, since Eclipse may clean your app when deploying you may want to add the reuired jars to tomcat (I assume) lib directoy so that they do not need to be redployed each time and they won't get cleaned up whne you run your build.
