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Created attachment 274566 [details] Use case to reproduce Steps to reproduce: * Import the attached project * Open the Tree representation * Perform a Ctrl+o and select the last not in the hierarchy * The representation becomes dirty * Close the modeling project without saving * The following NPE occurs: java.lang.NullPointerException at org.eclipse.emf.common.notify.impl.BasicNotifierImpl$EAdapterList.didRemove(BasicNotifierImpl.java:146) at org.eclipse.emf.common.util.AbstractEList.didClear(AbstractEList.java:170) at org.eclipse.emf.common.util.BasicEList.clear(BasicEList.java:639) at org.eclipse.emf.common.notify.impl.BasicNotifierImpl$EAdapterList.clear(BasicNotifierImpl.java:235) at org.eclipse.sirius.business.internal.session.danalysis.DAnalysisSessionImpl.disableAndRemoveECrossReferenceAdapters(DAnalysisSessionImpl.java:316) at org.eclipse.sirius.business.internal.session.danalysis.DAnalysisSessionImpl.close(DAnalysisSessionImpl.java:1280) at org.eclipse.sirius.business.internal.session.danalysis.SessionResourcesSynchronizer.processAction(SessionResourcesSynchronizer.java:168) at org.eclipse.sirius.business.internal.session.danalysis.SessionResourcesSynchronizer.statusesChanged(SessionResourcesSynchronizer.java:108) at org.eclipse.sirius.common.tools.api.resource.ResourceSetSync.notifyClientsInBatch(ResourceSetSync.java:392) at org.eclipse.sirius.common.tools.api.resource.ResourceSetSync.statusesChanged(ResourceSetSync.java:447) at org.eclipse.sirius.common.tools.internal.resource.ResourceSyncClientNotifier.run(ResourceSyncClientNotifier.java:78) at org.eclipse.sirius.common.tools.internal.resource.EditingSessionWorkspaceListener.resourceChanged(EditingSessionWorkspaceListener.java:59) at org.eclipse.core.internal.events.NotificationManager$1.run(NotificationManager.java:297) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:287) at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:150) at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:376) at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1499) at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:46) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:60)
(In reply to Florian Barbin from comment #0) > Created attachment 274566 [details] > Use case to reproduce > > Steps to reproduce: > * Import the attached project > * Open the Tree representation > * Perform a Ctrl+o and select the last not in the hierarchy What do you mean by "the last not in the hierarchy"?
(In reply to Pierre-Charles David from comment #1) > (In reply to Florian Barbin from comment #0) > > Created attachment 274566 [details] > > Use case to reproduce > > > > Steps to reproduce: > > * Import the attached project > > * Open the Tree representation > > * Perform a Ctrl+o and select the last not in the hierarchy > > What do you mean by "the last not in the hierarchy"? Oups, The last item.
On 6.1.1 I get a slightly different stack (at the top of the stack at least): java.util.ConcurrentModificationException at org.eclipse.emf.common.util.AbstractEList$EIterator.checkModCount(AbstractEList.java:760) at org.eclipse.emf.common.util.AbstractEList$EIterator.doNext(AbstractEList.java:708) at org.eclipse.emf.common.util.AbstractEList$EIterator.next(AbstractEList.java:694) at org.eclipse.sirius.business.internal.session.danalysis.DAnalysisSessionImpl.disableAndRemoveECrossReferenceAdapters(DAnalysisSessionImpl.java:316) at org.eclipse.sirius.business.internal.session.danalysis.DAnalysisSessionImpl.close(DAnalysisSessionImpl.java:1282) at org.eclipse.sirius.business.internal.session.danalysis.SessionResourcesSynchronizer.processAction(SessionResourcesSynchronizer.java:170) at org.eclipse.sirius.business.internal.session.danalysis.SessionResourcesSynchronizer.statusesChanged(SessionResourcesSynchronizer.java:110) at org.eclipse.sirius.common.tools.api.resource.ResourceSetSync.notifyClientsInBatch(ResourceSetSync.java:394) at org.eclipse.sirius.common.tools.api.resource.ResourceSetSync.statusesChanged(ResourceSetSync.java:449) at org.eclipse.sirius.common.tools.internal.resource.ResourceSyncClientNotifier.run(ResourceSyncClientNotifier.java:80) at org.eclipse.sirius.common.tools.internal.resource.EditingSessionWorkspaceListener.resourceChanged(EditingSessionWorkspaceListener.java:61) at org.eclipse.core.internal.events.NotificationManager$1.run(NotificationManager.java:299) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:289) at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:152) at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:374) at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1469) at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:46) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:56) The line in question (which triggers the CME), is "for (Resource resource : resourceSet.getResources()) {"
