A sample listener implementation:

import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class JaveleonListener implements ChangeListener
{
public void stateChanged(final ChangeEvent event)
{
//Clear caches or reload your UI
}

} // JaveleonListener

Just a few minor comments. In recent versions of Javeleon you don't need to specify the nbjdk and profile any more. Simply -javaagent:path/to/agent/javeleon.jar=port=9999 will do just fine. Javeleon 2.0 final release is just around the corner. There will be a new RC uploaded tomorrow.

When you setup -Djaveleon.reload.listener=app.MyListener you're expected to create the class app.MyListener which must implement the ChangeListener interface. If you do so you're able to run reload-specific code (e.g. clearing caches).

Thanks for providing the first plug-in on top of Javeleon René.

BTW, I've put this blog-entry on DZone at: http://www.dzone.com/links/unofficial_eclipse_plugin_for_javeleon.html