[news.eclipse.modeling.gmf] Re: Problem creating link from derived class

[Martin Jacob <mj@xxxxxxxxxxxxxx>]

Hi,

in addition to the information below I found that the EditPart for class B is used when generating a 
diagram from a the model. But for my understanding it should be EditPart for class BA.

Any idea how to solve the problem?

Martin

Martin Jacob wrote, On 04.02.2009 16:09:
> Hi,
>
> I want to create a link  between nodes.
> The ecore model is like this:
> the nodes:     Class A
> a link:        Class B
> another link     Class BA -> Class B
>
> I can create a link with class B but not with class BA. When I draw the 
> connection with class BA than I get the following exception:
>
> org.eclipse.core.commands.ExecutionException: While executing the 
> operation, an exception occurred
> at 
> org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:519) 
>
> at 
> org.eclipse.gmf.runtime.diagram.ui.parts.DiagramCommandStack.execute(DiagramCommandStack.java:205) 
>
> at 
> org.eclipse.gmf.runtime.diagram.ui.parts.DiagramCommandStack.execute(DiagramCommandStack.java:168) 
>
> at 
> org.eclipse.gmf.runtime.diagram.ui.parts.DiagramCommandStack.execute(DiagramCommandStack.java:155) 
>
> at org.eclipse.gef.tools.AbstractTool.executeCommand(AbstractTool.java:399)
> at 
> org.eclipse.gef.tools.AbstractTool.executeCurrentCommand(AbstractTool.java:411) 
>
> at 
> org.eclipse.gmf.runtime.diagram.ui.tools.ConnectionCreationTool.handleCreateConnection(ConnectionCreationTool.java:341) 
>
> at 
> org.eclipse.gmf.runtime.diagram.ui.tools.ConnectionCreationTool.handleButtonUp(ConnectionCreationTool.java:181) 
>
> at org.eclipse.gef.tools.AbstractTool.mouseUp(AbstractTool.java:1064)
> at org.eclipse.gef.EditDomain.mouseUp(EditDomain.java:263)
> at 
> org.eclipse.gef.ui.parts.DomainEventDispatcher.dispatchMouseReleased(DomainEventDispatcher.java:374) 
>
> at 
> org.eclipse.draw2d.LightweightSystem$EventHandler.mouseUp(LightweightSystem.java:538) 
>
> at 
> org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:207)
> at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
> at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
> at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3823)
> at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3422)
> at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382)
> at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346)
> at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198)
> at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493)
> at 
> org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288) 
>
> at 
> org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488)
> at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
> at 
> org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113) 
>
> at 
> org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193) 
>
> 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:386) 
>
> 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:549)
> at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
> at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
> at org.eclipse.equinox.launcher.Main.main(Main.java:1212)
> Caused by: org.eclipse.core.runtime.AssertionFailedException: null 
> argument:failed to create a view
> at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:86)
> at 
> org.eclipse.gmf.runtime.diagram.ui.commands.CreateCommand.doExecuteWithResult(CreateCommand.java:99) 
>
> at 
> org.eclipse.gmf.runtime.emf.commands.core.command.AbstractTransactionalCommand.doExecute(AbstractTransactionalCommand.java:247) 
>
> at 
> org.eclipse.emf.workspace.AbstractEMFOperation.execute(AbstractEMFOperation.java:169) 
>
> at 
> org.eclipse.gmf.runtime.common.core.command.CompositeCommand.doExecuteWithResult(CompositeCommand.java:403) 
>
> at 
> org.eclipse.gmf.runtime.common.core.command.AbstractCommand.execute(AbstractCommand.java:135) 
>
> at 
> org.eclipse.gmf.runtime.common.core.command.CompositeCommand.doExecuteWithResult(CompositeCommand.java:403) 
>
> at 
> org.eclipse.gmf.runtime.common.core.command.AbstractCommand.execute(AbstractCommand.java:135) 
>
> at 
> org.eclipse.gmf.runtime.common.core.command.CompositeCommand.doExecuteWithResult(CompositeCommand.java:403) 
>
> at 
> org.eclipse.gmf.runtime.common.core.command.AbstractCommand.execute(AbstractCommand.java:135) 
>
> at 
> org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:511) 
>
> .... 37 more
>
> I debug a bit and found that for Class BA is no ViewProvider registered 
> but it is for class B. I have no idea where I could register this 
> ViewProvider.
>
> Does any one know how to solve the problem?
>
> Thanks,        Martin