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Created attachment 133704 [details] thread dump This happened during automated test, I'm attaching thread dump. I've never seen it before so it could be "rare" => P3 for now NetBeans IDE Dev (Build 201304222301) (#22a9b7f7da3f) Linux version 3.2.0-34-generic running on amd64 JDK 1.7.0_21; Java HotSpot(TM) 64-Bit Server VM 23.21-b01; Oracle Corporation Java(TM) SE Runtime Environment 1.7.0_21-b11
Seems to be caused by the document instance refresh in the model - fix of the issue 219493. The fix doesn't seem to be clean to me now and I'll try to rewrite it which will also fix the deadlock.
The css model should not hold and handle the swing document instance. Instead of that the client should be responsible for applying changes to appropriate instance of swing document. The model should just provide a facility for easy applying of the changes.