java.lang.NullPointerException
at org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage.setInput(TabbedPropertySheetPage.java:727)
at org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage.selectionChanged(TabbedPropertySheetPage.java:555)
at org.jbpm.gd.common.editor.GraphicalViewer.fireSelectionChanged(GraphicalViewer.java:86)
at org.eclipse.gef.ui.parts.AbstractEditPartViewer$1.run(AbstractEditPartViewer.java:131)
at org.eclipse.gef.SelectionManager.fireSelectionChanged(SelectionManager.java:127)
at org.eclipse.gef.SelectionManager.deselect(SelectionManager.java:101)
at org.eclipse.gef.ui.parts.AbstractEditPartViewer.deselect(AbstractEditPartViewer.java:202)
at org.eclipse.gef.editparts.AbstractEditPart.removeNotify(AbstractEditPart.java:934)
at org.eclipse.gef.editparts.AbstractGraphicalEditPart.removeNotify(AbstractGraphicalEditPart.java:812)
at org.eclipse.gef.editparts.AbstractEditPart.removeChild(AbstractEditPart.java:872)
at org.eclipse.gef.editparts.AbstractEditPart.refreshChildren(AbstractEditPart.java:785)
at org.jbpm.gd.common.part.RootContainerGraphicalEditPart.propertyChange(RootContainerGraphicalEditPart.java:64)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
at org.jbpm.gd.common.notation.AbstractNotationElement.firePropertyChange(AbstractNotationElement.java:32)
at org.jbpm.gd.common.notation.RootContainer.removeNode(RootContainer.java:40)
at org.jbpm.gd.common.notation.RootContainer.removeNode(RootContainer.java:52)
at org.jbpm.gd.jpdl.notation.JpdlRootContainer.propertyChange(JpdlRootContainer.java:21)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
at org.jbpm.gd.common.model.AbstractSemanticElement.firePropertyChange(AbstractSemanticElement.java:20)
at org.jbpm.gd.jpdl.model.ProcessDefinition.removeNodeElement(ProcessDefinition.java:86)
at org.jbpm.gd.jpdl.command.NodeDeleteCommand.doRemove(NodeDeleteCommand.java:51)
at org.jbpm.gd.common.command.AbstractNodeDeleteCommand.execute(AbstractNodeDeleteCommand.java:55)
at org.eclipse.gef.commands.CompoundCommand.execute(CompoundCommand.java:111)
at org.eclipse.gef.commands.CommandStack.execute(CommandStack.java:197)
at org.eclipse.gef.ui.actions.WorkbenchPartAction.execute(WorkbenchPartAction.java:83)
at org.eclipse.gef.ui.actions.DeleteAction.run(DeleteAction.java:133)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
at org.eclipse.jface.commands.ActionHandler.execute(ActionHandler.java:119)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)
at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.executeCommand(WorkbenchKeyboard.java:468)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.press(WorkbenchKeyboard.java:786)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.processKeyEvent(WorkbenchKeyboard.java:885)
at org.eclipse.ui.internal.keys.OutOfOrderListener.handleEvent(OutOfOrderListener.java:76)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1282)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1267)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1294)
at org.eclipse.swt.widgets.Widget.gtk_key_press_event(Widget.java:730)
at org.eclipse.swt.widgets.Control.gtk_key_press_event(Control.java:2841)
at org.eclipse.swt.widgets.Composite.gtk_key_press_event(Composite.java:734)
at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:1743)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4796)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4360)
at org.eclipse.swt.internal.gtk.OS._gtk_main_do_event(Native Method)
at org.eclipse.swt.internal.gtk.OS.gtk_main_do_event(OS.java:8189)
at org.eclipse.swt.widgets.Display.eventProc(Display.java:1238)
at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method)
at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:2237)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3159)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
at org.eclipse.equinox.launcher.Main.run(Main.java:1408)
at org.eclipse.equinox.launcher.Main.main(Main.java:1384)