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java.lang.NullPointerException at org.netbeans.modules.uml.drawingarea.actions.SceneAcceptAction.<init>(SceneAcceptAction.java:98) at org.netbeans.modules.uml.drawingarea.UMLDiagramTopComponent$6.propertyChange (UMLDiagramTopComponent.java:750) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276) at org.netbeans.spi.palette.PaletteController$1.propertyChange(PaletteController.java:179) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276) at org.netbeans.modules.palette.DefaultModel.setSelectedItem(DefaultModel.java:116) at org.netbeans.modules.palette.ui.PalettePanel.select(PalettePanel.java:276) at org.netbeans.modules.palette.ui.CategoryDescriptor$2.valueChanged(CategoryDescriptor.java:113) at javax.swing.JList.fireSelectionValueChanged(JList.java:1765) at javax.swing.JList$ListSelectionHandler.valueChanged(JList.java:1779) at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167) at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:147) at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:194) at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:388) at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:398) at javax.swing.DefaultListSelectionModel.setSelectionInterval(DefaultListSelectionModel.java:442) at javax.swing.JList.setSelectionInterval(JList.java:2035) at javax.swing.plaf.basic.BasicListUI$Handler.adjustSelection(BasicListUI.java:2728) at javax.swing.plaf.basic.BasicListUI$Handler.mousePressed(BasicListUI.java:2684) at javax.swing.plaf.basic.BasicListUI$MouseInputHandler.mousePressed(BasicListUI.java:1502) at org.netbeans.modules.palette.ui.CategoryList$CategoryListUI$ListMouseInputHandler.mousePressed (CategoryList.java:453) at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:263) at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:262) at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:262) at java.awt.Component.processMouseEvent(Component.java:6131) at javax.swing.JComponent.processMouseEvent(JComponent.java:3265) at java.awt.Component.processEvent(Component.java:5899) at java.awt.Container.processEvent(Container.java:2023) at java.awt.Component.dispatchEventImpl(Component.java:4501) at java.awt.Container.dispatchEventImpl(Container.java:2081) at java.awt.Component.dispatchEvent(Component.java:4331) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4301) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3962) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3895) at java.awt.Container.dispatchEventImpl(Container.java:2067) at java.awt.Window.dispatchEventImpl(Window.java:2458) at java.awt.Component.dispatchEvent(Component.java:4331) [catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)