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[news.eclipse.modeling.gmf] Re: null pointer exception with draw2d 
Boris Blajer wrote:
> Hi Rene,
> 
> The stack trace indicates that the child you are creating returns null
> from its createFigure() method. AFAIK, no GMF generated edit parts
> exhibit this behavior, so please check if there is some hand-modified
> code (or use of custom templates).
>
I didn't modify any GMF-related code (only some code in the generated EMF
editor meta.editor.MetaEditor.java), nor did I use any custom JET templates.

Could this be caused by some mismatch between the gmfgraph and gmfmap file?
Both validate ok, so either the validation is too loose or there exists a
bug in the GMF code generator (the gmfgen file also validates ok).

Regards,
Rene
> Best regards,
> Boris
> 
> 
> 
> Rene Ladan wrote:
>> Rene Ladan wrote:
>>>
[..]
>>>
>>> java.lang.NullPointerException
>>>     at org.eclipse.draw2d.Figure.add(Figure.java:146)
>>>     at org.eclipse.draw2d.Figure.add(Figure.java:179)
>>>     at
>>> org.eclipse.gef.editparts.AbstractGraphicalEditPart.addChildVisual(AbstractGraphicalEditPart.java:198)
>>>
>>>     at
>>> meta.diagram.edit.parts.ComponentEditPart.addChildVisual(ComponentEditPart.java:135)
>>> <-- ?
>>>     at
>>> org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:197)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.addChild(GraphicalEditPart.java:1292)
>>>
>>>     at
>>> org.eclipse.gef.editparts.AbstractEditPart.refreshChildren(AbstractEditPart.java:727)
>>>
>>>     at
>>> org.eclipse.gef.editparts.AbstractEditPart.refresh(AbstractEditPart.java:677)
>>>
>>>     at
>>> org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:564)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.access$3(GraphicalEditPart.java:1)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart$3.run(GraphicalEditPart.java:836)
>>>
>>>     at
>>> org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.runExclusive(TransactionalEditingDomainImpl.java:262)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.refresh(GraphicalEditPart.java:826)
>>>
>>>     at
>>> org.eclipse.gef.editparts.AbstractEditPart.addNotify(AbstractEditPart.java:235)
>>>
>>>     at
>>> org.eclipse.gef.editparts.AbstractGraphicalEditPart.addNotify(AbstractGraphicalEditPart.java:212)
>>>
>>>     at
>>> org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:198)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.addChild(GraphicalEditPart.java:1292)
>>>
>>>     at
>>> org.eclipse.gef.editparts.AbstractEditPart.refreshChildren(AbstractEditPart.java:727)
>>>
>>>     at
>>> org.eclipse.gef.editparts.AbstractEditPart.refresh(AbstractEditPart.java:677)
>>>
>>>     at
>>> org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:564)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.access$3(GraphicalEditPart.java:1)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart$3.run(GraphicalEditPart.java:836)
>>>
>>>     at
>>> org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.runExclusive(TransactionalEditingDomainImpl.java:262)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.refresh(GraphicalEditPart.java:826)
>>>
>>>     at
>>> org.eclipse.gef.editparts.AbstractEditPart.addNotify(AbstractEditPart.java:235)
>>>
>>>     at
>>> org.eclipse.gef.editparts.AbstractGraphicalEditPart.addNotify(AbstractGraphicalEditPart.java:212)
>>>
>>>     at
>>> org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:198)
>>>
>>>     at
>>> org.eclipse.gef.editparts.SimpleRootEditPart.setContents(SimpleRootEditPart.java:101)
>>>
>>>     at
>>> org.eclipse.gef.ui.parts.AbstractEditPartViewer.setContents(AbstractEditPartViewer.java:601)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.parts.DiagramGraphicalViewer.setContents(DiagramGraphicalViewer.java:378)
>>>
>>>     at
>>> org.eclipse.gef.ui.parts.AbstractEditPartViewer.setContents(AbstractEditPartViewer.java:610)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor.initializeGraphicalViewerContents(DiagramEditor.java:857)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor.initializeGraphicalViewer(DiagramEditor.java:850)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditorWithFlyOutPalette.initializeGraphicalViewer(DiagramEditorWithFlyOutPalette.java:112)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor.createGraphicalViewer(DiagramEditor.java:794)
>>>
>>>     at
>>> org.eclipse.gef.ui.parts.GraphicalEditor.createPartControl(GraphicalEditor.java:163)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor.createPartControl(DiagramEditor.java:1548)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditorWithFlyOutPalette.createPartControl(DiagramEditorWithFlyOutPalette.java:310)
>>>
>>>     at
>>> org.eclipse.gmf.runtime.diagram.ui.resources.editor.parts.DiagramDocumentEditor.createPartControl(DiagramDocumentEditor.java:1459)
>>>
>>>     at
>>> org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:661)
>>>
>>>     at
>>> org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:426)
>>>
>>>     at
>>> org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:594)
>>>
>>>     at
>>> org.eclipse.ui.internal.EditorAreaHelper.setVisibleEditor(EditorAreaHelper.java:263)
>>>
>>>     at
>>> org.eclipse.ui.internal.EditorManager.setVisibleEditor(EditorManager.java:1405)
>>>
>>>     at
>>> org.eclipse.ui.internal.EditorManager$5.runWithException(EditorManager.java:939)
>>>
>>>     at
>>> org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
>>>
>>>     at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
>>>     at
>>> org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:124)
>>>
>>>     at
>>> org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3719)
>>>     at
>>> org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3356)
>>>     at
>>> org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:801)
>>>
>>>     at
>>> org.eclipse.ui.internal.Workbench$25.runWithException(Workbench.java:1342)
>>>
>>>     at
>>> org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
>>>
>>>     at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
>>>     at
>>> org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:124)
>>>
>>>     at
>>> org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3719)
>>>     at
>>> org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3356)
>>>     at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2309)
>>>     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:169)
>>>
>>>     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:515)
>>>     at org.eclipse.equinox.launcher.Main.basicRun(Main.java:455)
>>>     at org.eclipse.equinox.launcher.Main.run(Main.java:1193)
>>>     at org.eclipse.equinox.launcher.Main.main(Main.java:1169)