as @omerkudat said:
jps -v
prints out all java processes {processID, params list}
If the params list is not enough to recognize the applications you need,
try adding some dummy params when running them:
java -Dname=myApp -cp myApp.jar some.client.main.MainFrame
This will print like:
7780 MainFrame -Dname=myApp
and you can use the process ID to kill / monitor it.
