The Java debugger has a client/server design so that it can be used to debug programs that run locally (on the same workstation as the debugger) or remotely (on another computer on the network).
Local debugging is the simplest and most common kind of debugging.
After you have finished editing and building your Java program, you can
launch the program on your workstation using the
Run > Debug Configurations... menu item
on the workbench. Launching the program in this way will establish a
connection between the debugger client and the Java program that you are
launching. You may then use breakpoints, stepping, or expression
evaluation to debug your program.