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Steps to reproduce: - create a new Async sample - open AsynchronousSampleClient in designer - select and delete the first assign activity in the process - invoke Undo action. Exception will be thrown: java.lang.AssertionError at org.netbeans.modules.xml.xdm.xam.SyncUnit.<init>(SyncUnit.java:39) at org.netbeans.modules.xml.xdm.xam.AbstractXDMModel.prepareSyncUnit(AbstractXDMModel.java:179) at org.netbeans.modules.xml.xdm.xam.XDMListener.processChange(XDMListener.java:94) at org.netbeans.modules.xml.xdm.xam.XDMListener.processEvent(XDMListener.java:149) at org.netbeans.modules.xml.xdm.xam.XDMListener.propertyChange(XDMListener.java:167) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:270) at org.netbeans.modules.xml.xdm.XDMModel.fireDiffEvents(XDMModel.java:235) at org.netbeans.modules.xml.xdm.XDMModel.performDiff(XDMModel.java:1126) at org.netbeans.modules.xml.xdm.XDMModel.resetDocument(XDMModel.java:692) at org.netbeans.modules.xml.xdm.XDMModelUndoableEdit.undo(XDMModelUndoableEdit.java:77) at javax.swing.undo.CompoundEdit.undo(CompoundEdit.java:46) at org.netbeans.modules.xml.xam.AbstractModel$ModelUndoableEdit.undo(AbstractModel.java:418) at org.netbeans.modules.bpel.model.impl.BpelModelImpl$BpelModelUndoableEdit.undo(BpelModelImpl.java:582) at org.netbeans.modules.bpel.editors.multiview.FilterUndoableEdit.undo(FilterUndoableEdit.java:33) at org.netbeans.modules.bpel.editors.multiview.DesignerMultiViewElement$BeforeModificationEdit.undo(DesignerMultiViewElement.java:611) at javax.swing.undo.UndoManager.undoTo(UndoManager.java:210) at javax.swing.undo.UndoManager.undo(UndoManager.java:275) at org.netbeans.modules.bpel.editors.multiview.DesignerMultiViewElement$UndoRedoManager.undo(DesignerMultiViewElement.java:471) at org.openide.actions.UndoAction.performAction(UndoAction.java:134) at org.openide.util.actions.CallableSystemAction$1.run(CallableSystemAction.java:94) at org.netbeans.modules.openide.util.ActionsBridge.doPerformAction(ActionsBridge.java:47) at org.openide.util.actions.CallableSystemAction.actionPerformed(CallableSystemAction.java:90) at org.openide.windows.TopComponent.processKeyBinding(TopComponent.java:848) at javax.swing.JComponent.processKeyBindings(JComponent.java:2809) at javax.swing.JComponent.processKeyEvent(JComponent.java:2726) at java.awt.Component.processEvent(Component.java:5265) at java.awt.Container.processEvent(Container.java:1966) at java.awt.Component.dispatchEventImpl(Component.java:3955) at java.awt.Container.dispatchEventImpl(Container.java:2024) at java.awt.Component.dispatchEvent(Component.java:3803) at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1810) at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:672) at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:920) at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:798) at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:636) at java.awt.Component.dispatchEventImpl(Component.java:3841) at java.awt.Container.dispatchEventImpl(Container.java:2024) at java.awt.Window.dispatchEventImpl(Window.java:1774) at java.awt.Component.dispatchEvent(Component.java:3803) [catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:463) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149) at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
It seems this is again problem of XML tools team. I will monitor this bug .
*** Issue 79455 has been marked as a duplicate of this issue. ***
I can't reproduce the exception stack. The undo produce duplicate diagram objects however this should be a different issue.
Cannot see the described exception.
I confirm that now it is not reproducible. Mikhail could you please recheck it ?
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