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open a project, project properties, compiling sources tab, add library, edit, new library, OK and ClassCastException is thrown. It is possible to edit it when I reenter the dialog.
Created attachment 14626 [details] stack trace
Fixed.
This issue was solved long time ago. Because nobody has reopened it neither added comments, we are verifying/closing it now. If you are still able to reproduce the problem, please reopen. Thanks in advance.