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This bug was originally marked as duplicate of bug 225433, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.0.1 (Build 201408251540) VM: Java HotSpot(TM) 64-Bit Server VM, 25.20-b23, Java(TM) SE Runtime Environment, 1.8.0_20-b26 OS: Windows 7 User Comments: GUEST: Did not notice the exception from happening. Stacktrace: java.lang.NullPointerException at org.netbeans.modules.form.RADComponent.rename(RADComponent.java:566) at org.netbeans.modules.form.RADComponentNode.setName(RADComponentNode.java:398) at org.openide.actions.RenameAction.performAction(RenameAction.java:118) at org.openide.util.actions.NodeAction$DelegateAction$1.run(NodeAction.java:586) at org.openide.util.actions.ActionInvoker$1.run(ActionInvoker.java:95) at org.openide.util.actions.ActionInvoker.doPerformAction(ActionInvoker.java:116)
Created attachment 150022 [details] stacktrace
http://hg.netbeans.org/jet-main/rev/3ba654f2b832
Integrated into 'main-silver', will be available in build *201510030002* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-silver/rev/3ba654f2b832 User: Tomas Pavek <tpavek@netbeans.org> Log: #248067: while rename dialog for a component is opened, form might be reloaded on background due to an external change