[news.eclipse.modeling.gmf] Problem in saving java.util.List in model.

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[news.eclipse.modeling.gmf] Problem in saving java.util.List in model.

From: biju <biju_gopinathan@xxxxxxxxxxxxxx>
Date: Thu, 27 Sep 2007 18:08:06 +0530
Newsgroups: eclipse.modeling.gmf
Organization: EclipseCorner
User-agent: Thunderbird 1.5.0.13 (Windows/20070809)

Hi Friends,

In my model, I have a class 'A' in which I need to set a property 'id' which is a java.util.List. I am setting this list programatically from my edit part, using data from a pop up editor.

I did it as follows:.......................................

private void setNewMaterialListToModel(java.util.List materialList) {

org.eclipse.emf.common.command.Command cmd = SetCommand.create(editPart
.getEditingDomain(), ((View) editPart.getModel()).getElement(),
ProcessPackage.eINSTANCE.getMaterialProvider_ProvidedMaterialIds(),
				materialList);
		editPart.getEditingDomain().getCommandStack().execute(cmd);

}
............................................................

The save button gets enabled in the editor an on saving it is added in to the xmi file, and I can see it in the properties view also. But on re opening the editor it is not visible in properties view and a NullPointerException message pop ups. And in the log file it shows the following stack trace.

         What could be wrong..?

         Any Idea               Thanks                      Biju

________________________________________________________________________

!ENTRY org.eclipse.ui.workbench 4 2 2007-09-27 18:06:58.265
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.ui.workbench".
!STACK 0
java.lang.NullPointerException
	at org.eclipse.ui.operations.OperationHistoryActionHandler.shortenText(OperationHistoryActionHandler.java:471)
	at org.eclipse.ui.operations.OperationHistoryActionHandler.update(OperationHistoryActionHandler.java:448)
	at org.eclipse.ui.operations.OperationHistoryActionHandler.<init>(OperationHistoryActionHandler.java:220)
	at org.eclipse.ui.operations.UndoActionHandler.<init>(UndoActionHandler.java:45)
	at org.eclipse.gmf.runtime.common.ui.action.actions.global.GlobalUndoAction.initializeWithContext(GlobalUndoAction.java:111)
	at org.eclipse.gmf.runtime.common.ui.action.actions.global.GlobalUndoAction.setWorkbenchPart(GlobalUndoAction.java:91)
	at org.eclipse.gmf.runtime.common.ui.action.AbstractActionHandler$2.partActivated(AbstractActionHandler.java:156)
	at org.eclipse.ui.internal.PartListenerList$1.run(PartListenerList.java:72)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
	at org.eclipse.core.runtime.Platform.run(Platform.java:857)
	at org.eclipse.ui.internal.PartListenerList.fireEvent(PartListenerList.java:57)
	at org.eclipse.ui.internal.PartListenerList.firePartActivated(PartListenerList.java:70)
	at org.eclipse.ui.internal.PartService.firePartActivated(PartService.java:73)
	at org.eclipse.ui.internal.PartService.setActivePart(PartService.java:171)
	at org.eclipse.ui.internal.WorkbenchPagePartList.fireActivePartChanged(WorkbenchPagePartList.java:56)
	at org.eclipse.ui.internal.PartList.setActivePart(PartList.java:126)
	at org.eclipse.ui.internal.WorkbenchPage.setActivePart(WorkbenchPage.java:3384)
	at org.eclipse.ui.internal.WorkbenchPage.requestActivation(WorkbenchPage.java:2928)
	at org.eclipse.ui.internal.PartPane.requestActivation(PartPane.java:265)
	at org.eclipse.ui.internal.EditorPane.requestActivation(EditorPane.java:98)
	at org.eclipse.ui.internal.PartPane.handleEvent(PartPane.java:229)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:962)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:943)
	at org.eclipse.swt.widgets.Shell.setActiveControl(Shell.java:1273)
	at org.eclipse.swt.widgets.Shell.WM_MOUSEACTIVATE(Shell.java:2015)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:3713)
	at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:291)
	at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1584)
	at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:1753)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4364)
	at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method)
	at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2259)
	at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:77)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:3760)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4364)
	at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method)
	at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2259)
	at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:77)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:3760)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4364)
	at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method)
	at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2259)
	at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:77)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:3760)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4364)
	at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method)
	at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2259)
	at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:77)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:3760)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4364)
	at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method)
	at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2259)
	at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:77)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:3760)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4364)
	at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method)
	at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2259)
	at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:77)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:3760)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4364)
	at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method)
	at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2259)
	at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:77)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:3760)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4364)
	at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native Method)
	at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java:2259)
	at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java:77)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:3760)
	at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:291)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4364)
	at org.eclipse.swt.internal.win32.OS.PeekMessageW(Native Method)
	at org.eclipse.swt.internal.win32.OS.PeekMessage(OS.java:2768)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3288)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353)
	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219)
	at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:153)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)
	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.equinox.launcher.Main.invokeFramework(Main.java:504)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:443)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1169)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1144)

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