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Every change to source code is causing this now ...
Created attachment 18339 [details] netbeans log file
this error occurrs when I try to extend a class from e.g. javax.swing the tool will display the classes available, but as soon as I select a class or type a J (in order to obtain a JFrame), the error window pops up, msg: Cannot find symbol: javax.swing jdk1.5.0 rt.jar is part the selected java platform , and exists.
Reassigning for evaluation.
This was fixed some time ago. I recommend to get a newer build (e.g. the latest q-build).