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This problem has been going on for quite a while and makes debugging almost useless. It happens on all my projects and I have no idea why. In debugging, step over works fine. If I press step into all the debugger controls become disabled and nothing else happens! The only workaround to get out of that situation (without stopping the debugger) is the special per-thread play button in the debugger console. I can demonstrate to step into I need to guess the destination method (which is hard with polymorphism) and place a breakpoint there. The video of the issue is a bit big so I hosted it here: https://dl.dropboxusercontent.com/u/57067724/netbeans_bug.mov notice I press step into and all the controls become disabled. I then place a breakpoint in the method to show that the code wasn't reached yet and that nothing happened really. This happened with Java 6, 7 and 8 and doesn't seem to be VM specific. I'm guessing something broke in my install. I can probably wipe out NB and cleanly install but setting it up properly (after the last time I did it) was a disaster...
What are the sources that you're debugging? There's no paintComponent() method in java.awt.Component And java.awt.Graphics does not have getClipX() method. When I'm trying to step into methods on java.awt.Graphics, it works fine for me. Can you please check a latest 8.1 dev build if step into works there? The symptoms looks similar to issue #255126 which was fixed recently.
That's Codename One: https://github.com/codenameone/CodenameOne/ It happens with any set of sources regardless of whether I step into a library or within my code. As I said, this has been going on for quite some time and is unique to my environment. I'll try 8.1.