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Created attachment 284963 [details] Model to reproduce In this specific scenario, the error "Unhandled event loop exception" and the warning "MapModeUtil#getMapMode(IFigure fig) fig parameter must be attached to a parent - using default MapMode" are raised on ODTE 11.4 but not on ODTE 11.3 and ODCE 11.4: - Open the "new ePackage" diagram representation, the Error Log view and "My.odesign" file. - In the odesign, select My > vsm_test > ePackage > Default > eClass and add a new Sub Node. Sets is id to "eAttribute", and its Domain Class to "ecore::EAttribute", then add a style (for example Square) - Save - Select My > vsm_test > ePackage > Default > eClass, and sets its Children representation to "Vertical Stack". - Create a New Diagram Element > Container, sets its id to "attContainer", its Domain Class to "ecore::Eclass" and its Semantic Candidate Expression to "var:self" - Drag and drop the eAttribute Sub Node to the new container - Save - Check Error Log: Unhandled event loop exception java.lang.NullPointerException at org.eclipse.gmf.runtime.diagram.ui.commands.DeferredLayoutCommand$1.run(DeferredLayoutCommand.java:154) at org.eclipse.gmf.runtime.diagram.ui.util.EditPartUtil.synchronizeRunnableToMainThread(EditPartUtil.java:107) at org.eclipse.gmf.runtime.diagram.ui.commands.DeferredLayoutCommand.doExecuteWithResult(DeferredLayoutCommand.java:187) at org.eclipse.gmf.runtime.emf.commands.core.command.AbstractTransactionalCommand.doExecute(AbstractTransactionalCommand.java:248) at org.eclipse.emf.workspace.AbstractEMFOperation.execute(AbstractEMFOperation.java:150) at org.eclipse.gmf.runtime.diagram.ui.commands.ICommandProxy.execute(ICommandProxy.java:69) at org.eclipse.gef.commands.CompoundCommand.execute(CompoundCommand.java:129) at org.eclipse.sirius.diagram.ui.internal.refresh.layout.SiriusCanonicalLayoutCommand.executeLayoutDueToExternalChanges(SiriusCanonicalLayoutCommand.java:118) at org.eclipse.sirius.diagram.ui.internal.refresh.layout.SiriusCanonicalLayoutCommand.access$3(SiriusCanonicalLayoutCommand.java:114) at org.eclipse.sirius.diagram.ui.internal.refresh.layout.SiriusCanonicalLayoutCommand$1.run(SiriusCanonicalLayoutCommand.java:100) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:185) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4005) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3633) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1158) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1047) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155) at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:658) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:557) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:154) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:150) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255) 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:657) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594) at org.eclipse.equinox.launcher.Main.run(Main.java:1447) Warning: MapModeUtil#getMapMode(IFigure fig) fig parameter must be attached to a parent - using default MapMode
