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error in workflow designing using jBPM engine

Question asked by alfrescouser on Feb 10, 2009
hello friends,
please suggest me solution for this
i am using jBoss jBPM jbpm-gpd-for-eclipse-3.0-beta1 plugin with eclipse SDK 3.1 for workflow designing .
for first time it is opening properly , But when i save my workflow processdefinition.xml and try to open it next day , then it does not open the jBPM editor and throws the following exception.

java.lang.NullPointerException
at org.jbpm.ui.editor.DesignerEditor.createProcessDefinitionXMLPage(Unknown Source)
at org.jbpm.ui.editor.DesignerEditor.createPages(Unknown Source)
at org.eclipse.ui.part.MultiPageEditorPart.createPartControl(MultiPageEditorPart.java:241)
at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:585)
at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:365)
at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:552)
at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:283)
at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:126)
at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:268)
at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)
at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:391)
at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1102)
at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1051)
at org.eclipse.ui.internal.PartStack.presentationSelectionChanged(PartStack.java:785)
at org.eclipse.ui.internal.PartStack.access$0(PartStack.java:771)
at org.eclipse.ui.internal.PartStack$1.selectPart(PartStack.java:119)
at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation$1.handleEvent(TabbedStackPresentation.java:126)
at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:267)
at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:276)
at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder.access$1(DefaultTabFolder.java:1)
at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder$2.handleEvent(DefaultTabFolder.java:84)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:843)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:867)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:852)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:660)
at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3138)
at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1922)
at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:288)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:843)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3080)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2713)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1699)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1663)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:367)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143)
at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:103)
at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:163)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:334)
at org.eclipse.core.launcher.Main.basicRun(Main.java:278)
at org.eclipse.core.launcher.Main.run(Main.java:973)
at org.eclipse.core.launcher.Main.main(Main.java:948)

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