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This issue exist all version of Netbeans release. While we want to check library's source code from netbeans it look like netbeans wouldn't know instance or method inherit from father class. The example is that when I want to debug Spring framework's source code there are many compile error exist Spring's source code. Maybe this is happen because library's source code file is more than one. It wouldn't into super class's method while debug a child class which call super class's method because library's source code have compile error. One solution is that we have to let this specify thread run which in order to into super class's method. By the way, I don't think IDE should tell user any compile error while we open any library's source code because this behavior would confuse netbeans's user. At this point netbeans would reference Eclipse's similar behavior because Eclipse just display source code but we don't get any compile erroe. I don't how Eclipse make it happen, maybe Eclipse just load library's class instead of compile source code. Any way please discuss this issue. Thanks!
The errors in the library does nothing in common with debugging. As far as I know debugger does not step into (non-project) dependencies, but maybe it was changed. If you want to step into the library sources you have to enable the library sources in the Window/Debugging/Sources.
Non showing errors in libs is possible, keeping as enhancement.