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java.lang.NullPointerException at org.eclipse.mylyn.modeling.gmf.ContextDecoratorProvider.accepts(ContextDecoratorProvider.java:151) at org.eclipse.mylyn.modeling.gmf.ContextDecoratorProvider.accepts(ContextDecoratorProvider.java:149) at org.eclipse.mylyn.modeling.gmf.ContextDecoratorProvider.provides(ContextDecoratorProvider.java:136) at org.eclipse.gmf.runtime.diagram.ui.internal.services.decorator.DecoratorService$ProviderDescriptor.provides(DecoratorService.java:76) at org.eclipse.gmf.runtime.common.core.service.Service.safeProvides(Service.java:859) at org.eclipse.gmf.runtime.common.core.service.ExecutionStrategy.getUncachedProviders(ExecutionStrategy.java:254) at org.eclipse.gmf.runtime.common.core.service.Service.getProviders(Service.java:537) at org.eclipse.gmf.runtime.common.core.service.ExecutionStrategy$4.execute(ExecutionStrategy.java:178) at org.eclipse.gmf.runtime.common.core.service.Service.execute(Service.java:651) at org.eclipse.gmf.runtime.diagram.ui.internal.services.decorator.DecoratorService.createDecorators(DecoratorService.java:121) at org.eclipse.gmf.runtime.diagram.ui.editpolicies.DecorationEditPolicy.activate(DecorationEditPolicy.java:201) at org.eclipse.gef.editparts.AbstractEditPart.activateEditPolicies(AbstractEditPart.java:174) at org.eclipse.gef.editparts.AbstractEditPart.activate(AbstractEditPart.java:156) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.activate(AbstractGraphicalEditPart.java:195) at org.eclipse.gmf.runtime.diagram.ui.editparts.ConnectionEditPart.activate(ConnectionEditPart.java:257) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.addSourceConnection(AbstractGraphicalEditPart.java:262) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refreshSourceConnections(AbstractGraphicalEditPart.java:697) at org.eclipse.gmf.runtime.diagram.ui.editparts.ShapeNodeEditPart.handleNotificationEvent(ShapeNodeEditPart.java:227) at org.eclipse.emf.ecoretools.diagram.edit.parts.EClass2EditPart.handleNotificationEvent(EClass2EditPart.java:450) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.notifyChanged(GraphicalEditPart.java:1438) at org.eclipse.gmf.runtime.diagram.core.listener.DiagramEventBroker.fireNotification(DiagramEventBroker.java:500) at org.eclipse.gmf.runtime.diagram.core.listener.DiagramEventBroker.resourceSetChanged(DiagramEventBroker.java:395) at org.eclipse.gmf.runtime.diagram.ui.DiagramEventBrokerThreadSafe.resourceSetChanged(DiagramEventBrokerThreadSafe.java:73) at org.eclipse.gmf.runtime.diagram.core.DiagramEditingDomainFactory$DiagramEditingDomain.postcommit(DiagramEditingDomainFactory.java:214) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.deactivate(TransactionalEditingDomainImpl.java:543) at org.eclipse.emf.transaction.impl.TransactionImpl.close(TransactionImpl.java:712) at org.eclipse.emf.transaction.impl.TransactionImpl.commit(TransactionImpl.java:474) at org.eclipse.emf.workspace.AbstractEMFOperation.execute(AbstractEMFOperation.java:155) 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.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.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:513) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramCommandStack.execute(DiagramCommandStack.java:206) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramCommandStack.execute(DiagramCommandStack.java:169) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramCommandStack.execute(DiagramCommandStack.java:156) at org.eclipse.gef.tools.AbstractTool.executeCommand(AbstractTool.java:425) at org.eclipse.gef.tools.AbstractTool.executeCurrentCommand(AbstractTool.java:438) at org.eclipse.gmf.runtime.diagram.ui.tools.ConnectionCreationTool.handleCreateConnection(ConnectionCreationTool.java:342) at org.eclipse.gmf.runtime.diagram.ui.tools.ConnectionCreationTool.handleButtonUp(ConnectionCreationTool.java:182) at org.eclipse.gef.tools.AbstractTool.mouseUp(AbstractTool.java:1200) at org.eclipse.gef.EditDomain.mouseUp(EditDomain.java:301) at org.eclipse.gef.ui.parts.DomainEventDispatcher.dispatchMouseReleased(DomainEventDispatcher.java:380) at org.eclipse.draw2d.LightweightSystem$EventHandler.mouseUp(LightweightSystem.java:548) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:219) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4125) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1457) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1480) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1465) at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1270) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3971) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3610) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) 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:344) 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:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410) at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
Seems that the issue was coming from GMF providing an edge with no target.
