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Currently the Netbeans Java debugger requires one to have a proper Netbeans project open in order to add line breakpoints. It should also be possible to add line breakpoints by specifying class name and line to break on (as with jdb). Background for this need is that I often don't have a valid project open in Netbeans when using its debugger (to debug a remote server process), and being able to set line breakpoints would definitely be useful.