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In the AWT queue there should nobody wait at default requestprocessor. See the deadlock between AWT queue and def. requestproc. Simply way to reproduce -> create two projects and in both of them open some form and try switching between them. "OpenIDE Request Processor-0" daemon prio=1 tid=0x30d898 nid=0x11 waiting on monitor [0xf157f000..0xf15819e0] at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:420) at java.awt.EventQueue.invokeAndWait(EventQueue.java:547) at org.openide.util.Mutex.doEventAccess(Mutex.java:871) at org.openide.util.Mutex.readAccess(Mutex.java:193) at org.netbeans.modules.form.FormLAF.executeWithLookAndFeel(FormLAF.java:41) at org.netbeans.modules.form.CreationFactory.createDefaultInstance(CreationFactory.java:68) at org.netbeans.modules.form.BeanSupport.createBeanInstance(BeanSupport.java:57) at org.netbeans.modules.form.RADComponent.createBeanInstance(RADComponent.java:219) at org.netbeans.modules.form.RADComponent.setComponent(RADComponent.java:126) at org.netbeans.modules.form.FormModel.setFormInfo(FormModel.java:86) at org.netbeans.modules.form.GandalfPersistenceManager.loadForm(GandalfPersistenceManager.java:268) at org.netbeans.modules.form.FormEditorSupport.loadForm(FormEditorSupport.java:106) at org.netbeans.modules.form.FormDesigner.readExternal(FormDesigner.java:116) at org.openide.windows.TopComponent$Replacer.readObject(TopComponent.java:705) at java.lang.reflect.Method.invoke(Native Method) at java.io.ObjectInputStream.invokeObjectReader(ObjectInputStream.java:2214) at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1411) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236) at org.openide.util.io.NbMarshalledObject.get(NbMarshalledObject.java:88) at org.netbeans.core.windows.WindowManagerImpl$TopComponentManager.validateData(WindowManagerImpl.java:1343) at org.netbeans.core.windows.frames.DefaultContainerImpl.validateData(DefaultContainerImpl.java:860) at org.netbeans.core.windows.frames.DefaultContainerImpl.validateData(DefaultContainerImpl.java:833) at org.netbeans.core.windows.frames.MultiTabbedContainerImpl.validateData(MultiTabbedContainerImpl.java:483) at org.netbeans.core.windows.ModeImpl.validateData(ModeImpl.java:1223) at org.netbeans.core.windows.WorkspaceVisibilityManager.processModesValidation(WorkspaceVisibilityManager.java:323) at org.netbeans.core.windows.WorkspaceVisibilityManager.validateModes(WorkspaceVisibilityManager.java:233) at org.netbeans.core.windows.WorkspaceImpl.validateData(WorkspaceImpl.java:630) at org.netbeans.core.windows.WindowManagerImpl$SerializationReplacer.readResolve(WindowManagerImpl.java:868) at java.lang.reflect.Method.invoke(Native Method) at java.io.ObjectStreamClass.invokeMethod(ObjectStreamClass.java:1615) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:393) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236) at org.openide.util.io.NbMarshalledObject.get(NbMarshalledObject.java:88) at org.netbeans.modules.projects.PSupport.updateWindowManager(PSupport.java:832) at org.netbeans.modules.projects.PSupport.projectOpen(PSupport.java:252) at org.netbeans.core.NbProjectOperation.setProject(NbProjectOperation.java:129) at org.netbeans.core.NbTopManager.openProject(NbTopManager.java:457) at org.netbeans.modules.projects.ProjectManagerPanel.openProject(ProjectManagerPanel.java:313) at org.netbeans.modules.projects.ProjectManagerPanel.access$1200(ProjectManagerPanel.java:38) at org.netbeans.modules.projects.ProjectManagerPanel$12.run(ProjectManagerPanel.java:283) at org.openide.util.Task.run(Task.java:124) at org.openide.util.RequestProcessor$ProcessorThread.run(RequestProcessor.java:584) "AWT-Motif" prio=6 tid=0x281a10 nid=0xf runnable [0xf1781000..0xf17819e0] at sun.awt.motif.MToolkit.run(Native Method) at java.lang.Thread.run(Thread.java:484) "SunToolkit.PostEventQueue-0" prio=6 tid=0x22b390 nid=0xe waiting on monitor [0xf1881000..0xf18819e0] at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:420) at sun.awt.PostEventQueue.run(SunToolkit.java:491) "AWT-EventQueue-0" prio=6 tid=0x22b260 nid=0xd waiting on monitor [0xf1981000..0xf19819e0] at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Object.java:420) at org.openide.util.Task.waitFinishedImpl(Task.java:82) at org.openide.util.RequestProcessor$Task.waitFinishedImpl(RequestProcessor.java:390) at org.openide.util.Task.waitFinished(Task.java:71) at org.openide.awt.UndoRedo$Manager.canUndo(UndoRedo.java:148) at org.openide.actions.UndoAction$1.run(UndoAction.java:80) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:154) at java.awt.EventQueue.dispatchEvent(EventQueue.java:337) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)
*** Issue 10746 has been marked as a duplicate of this issue. ***
Fixed in org.openide.awt.UndoRedo.Manager: Added internal RequestProcessor to avoid deadlock between default RequestProcessor thread and AWT thread. Also added regression test UndoRedoTest to openide/test/regr/src to reproduce this deadlock.
verified 3.2 #21
Target milestone -> 3.2
Resolved for 3.4.x or earlier, no new info since then -> closing.