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When a component, that was dragged on a form, references log4j, the form cannot be opened in NB 6.7. This works fine in NB 6.5. Attaching messages.log and sample project. Try to open the form ControlsTester.
Created attachment 84699 [details] messages.log
Created attachment 84701 [details] Sample project
This problem is caused by issue 160378 e.g. by Maven module. The mentioned issue was fixed in the development builds of NetBeans 6.8 already. If you want to use components that are using log4j in NetBeans 6.7 then you have to deactivate the Maven plug-in. *** This issue has been marked as a duplicate of 160378 ***