Punith,
For java debugging, don't use the standard Agentry listen port which is 7003. Trying to use the same port that is being used for Angel front end will cause the error you received because the port is already in use. Use something that is not being used, for example: port 7090
nonStandardJavaOptions=-Xdebug -Xrunjdwp:transport=dt_socket,address=7090,server=y,suspend=n
Set up your debug session with 7090 also in Eclipse.
Jason Latko - Senior Product Developer at SAP