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This bug was originally marked as duplicate of bug 177556, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE Dev (Build 20150423-855d82a1ab66) VM: Java HotSpot(TM) 64-Bit Server VM, 25.60-b12, Java(TM) SE Runtime Environment, 1.8.0_60-ea-b12 OS: Linux User Comments: mentlicher: Started Java project. Stacktrace: java.lang.AssertionError at org.netbeans.core.io.ui.IOWindow$IOWindowImpl.setTitle(IOWindow.java:406) at org.netbeans.core.io.ui.IOWindow.setTitle(IOWindow.java:141) at org.openide.windows.IOContainer.setTitle(IOContainer.java:190) at org.netbeans.core.output2.Controller$CoalescedNameUpdater.run(Controller.java:275) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
Created attachment 153334 [details] stacktrace
I'm sorry, I cannot reproduce it. It seems to be some minor bug in UI. Decreasing priority. Feel free to increase it if you encounter this problem again. Thank you.