[news.eclipse.modeling.gmf] Cannot delete connection when specified fiel

[Bonkers <nhaphuong@xxxxxx>]

Hi,

I want to develope something like an Entity Relation Model with GMF. My 
nodes should represent the tables and the compartment in the nodes the 
attributes of the table.

Ok, I have two nodes (table A und table B). Table A references to table 
B. It's the concept of primary und foreign key. To decribe this 
relationship graphically I draw a connection between the nodes.

In the property view of the relation, the source and target are correctly.

Source is Table A
Target is Table B

Now I also want to reference to the attributes of the table. For better 
understanding you can look at the attach.
If the property of FK Reference and PK Reference are filled, I cannot 
delete the connection. If these fields are empty I can delete the 
connection.

I looked at the error log and the message is an execute error.
I google this error and in the news they say that this error message has 
something to do with OCL constraint. But I can't bring my case with the 
case in the newsgroup together.

I hope anybody can help me. Thanks.

Regards Phuong

------------------------------------------------

Here the detail log:

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:193)
	at 
org.eclipse.gmf.runtime.diagram.ui.parts.DiagramCommandStack.execute(DiagramCommandStack.java:168)
	at 
org.eclipse.gmf.runtime.diagram.ui.actions.DiagramAction.execute(DiagramAction.java:141)
	at 
org.eclipse.gmf.runtime.diagram.ui.actions.DiagramAction.doRun(DiagramAction.java:103)
	at 
org.eclipse.gmf.runtime.common.ui.action.AbstractActionHandler.run(AbstractActionHandler.java:359)
	at 
org.eclipse.gmf.runtime.common.ui.action.ActionManager$1.run(ActionManager.java:225)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
	at 
org.eclipse.gmf.runtime.common.ui.action.ActionManager.run(ActionManager.java:223)
	at 
org.eclipse.gmf.runtime.common.ui.action.AbstractActionHandler.runWithEvent(AbstractActionHandler.java:377)
	at 
org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:546)
	at 
org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:490)
	at 
org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:402)
	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.Display.runDeferredEvents(Display.java:3682)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3293)
	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$4.run(Workbench.java:466)
	at 
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)
	at 
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at 
org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106)
	at 
org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:169)
	at 
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
	at 
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
	at 
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)
	at 
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:508)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1173)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1148)
Caused by: java.lang.ClassCastException: java.lang.Boolean cannot be 
cast to org.eclipse.emf.ecore.EObject
	at 
org.eclipse.emf.ecore.util.ECrossReferenceAdapter.handleCrossReference(ECrossReferenceAdapter.java:608)
	at 
org.eclipse.emf.ecore.util.ECrossReferenceAdapter.selfAdapt(ECrossReferenceAdapter.java:447)
	at 
org.eclipse.gmf.runtime.emf.core.util.CrossReferenceAdapter.selfAdapt(CrossReferenceAdapter.java:92)
	at 
org.eclipse.emf.ecore.util.ECrossReferenceAdapter.notifyChanged(ECrossReferenceAdapter.java:425)
	at 
org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:247)
	at 
org.eclipse.emf.ecore.util.EObjectEList$Unsettable.unset(EObjectEList.java:59)
	at 
org.eclipse.erm.schema.impl.RelationImpl.unsetFK_Reference(RelationImpl.java:369)
	at org.eclipse.erm.schema.impl.RelationImpl.eUnset(RelationImpl.java:472)
	at 
org.eclipse.emf.ecore.impl.BasicEObjectImpl.eUnset(BasicEObjectImpl.java:1143)
	at 
org.eclipse.gmf.runtime.emf.type.core.commands.DestroyElementCommand.tearDownOutgoingReferences(DestroyElementCommand.java:191)
	at 
org.eclipse.gmf.runtime.emf.type.core.commands.DestroyElementCommand.doExecuteWithResult(DestroyElementCommand.java:124)
	at 
org.eclipse.gmf.runtime.emf.commands.core.command.AbstractTransactionalCommand.doExecute(AbstractTransactionalCommand.java:246)
	at 
org.eclipse.emf.workspace.AbstractEMFOperation.execute(AbstractEMFOperation.java:137)
	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:134)
	at 
org.eclipse.emf.workspace.CompositeEMFOperation.doExecute(CompositeEMFOperation.java:212)
	at 
org.eclipse.emf.workspace.AbstractEMFOperation.execute(AbstractEMFOperation.java:137)
	at 
org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:511)
	... 37 more