This documentation is currently under development.
A XMA Application consists on an Server-part and a Client-part. If you would like to debug any part you have to set an Breakpoint. Then start the application in the Debug-Mode (Run->Debug... or Run->Debug As) or use this button:
Whichever side (Client/Server) you will debug, start this side in the Debug Mode.
After this the Debug View will be opened.
For more Information about Debugging please take a look into the Java Development User Guide -> Concepts -> Debugger Help.