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After creation of a model, it happens sometimes on next reload of the model. Error log is filled with a lot of "unexpected errors" with following stack trace: java.lang.NullPointerException at org.eclipse.papyrus.uml.modelexplorer.UMLContentProvider.getRootElements(UMLContentProvider.java:50) at org.eclipse.papyrus.modelexplorer.MoDiscoContentProvider.getRootElements(MoDiscoContentProvider.java:128) at org.eclipse.papyrus.modelexplorer.MoDiscoContentProvider.getRootElements(MoDiscoContentProvider.java:1) at org.eclipse.emf.facet.infra.browser.uicore.CustomizableModelContentProvider.getElements(CustomizableModelContentProvider.java:38) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.getElements(SafeDelegateTreeContentProvider.java:101) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider$1.run(NavigatorContentServiceContentProvider.java:149) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.internalGetChildren(NavigatorContentServiceContentProvider.java:139) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.getElements(NavigatorContentServiceContentProvider.java:114) at org.eclipse.jface.viewers.StructuredViewer.getRawChildren(StructuredViewer.java:1010) at org.eclipse.jface.viewers.ColumnViewer.getRawChildren(ColumnViewer.java:703) at org.eclipse.jface.viewers.AbstractTreeViewer.getRawChildren(AbstractTreeViewer.java:1336) at org.eclipse.jface.viewers.TreeViewer.getRawChildren(TreeViewer.java:391) at org.eclipse.jface.viewers.StructuredViewer.getFilteredChildren(StructuredViewer.java:917) at org.eclipse.jface.viewers.AbstractTreeViewer.getSortedChildren(AbstractTreeViewer.java:605) at org.eclipse.jface.viewers.AbstractTreeViewer.updateChildren(AbstractTreeViewer.java:2622) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefreshStruct(AbstractTreeViewer.java:1908) at org.eclipse.jface.viewers.TreeViewer.internalRefreshStruct(TreeViewer.java:721) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1883) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1840) at org.eclipse.ui.navigator.CommonViewer.internalRefresh(CommonViewer.java:561) at org.eclipse.jface.viewers.StructuredViewer$8.run(StructuredViewer.java:1535) at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1443) at org.eclipse.jface.viewers.TreeViewer.preservingSelection(TreeViewer.java:403) at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1404) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1533) at org.eclipse.jface.viewers.ColumnViewer.refresh(ColumnViewer.java:548) at org.eclipse.ui.navigator.CommonViewer.refresh(CommonViewer.java:353) at org.eclipse.ui.navigator.CommonViewer.refresh(CommonViewer.java:510) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1465) at org.eclipse.papyrus.modelexplorer.ModelExplorerView.refresh(ModelExplorerView.java:397) at org.eclipse.papyrus.modelexplorer.ModelExplorerView$4.run(ModelExplorerView.java:379) at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:180) at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150) at org.eclipse.swt.widgets.Display.syncExec(Display.java:4683) at org.eclipse.papyrus.modelexplorer.ModelExplorerView.handleResourceSetChanged(ModelExplorerView.java:373) at org.eclipse.papyrus.modelexplorer.ModelExplorerView.access$2(ModelExplorerView.java:366) at org.eclipse.papyrus.modelexplorer.ModelExplorerView$2.resourceSetChanged(ModelExplorerView.java:355) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl$2.run(TransactionalEditingDomainImpl.java:827) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.runExclusive(TransactionalEditingDomainImpl.java:328) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.broadcastUnbatched(TransactionalEditingDomainImpl.java:818) at org.eclipse.emf.transaction.impl.TransactionChangeRecorder.appendNotification(TransactionChangeRecorder.java:319) at org.eclipse.emf.transaction.impl.TransactionChangeRecorder.processResourceNotification(TransactionChangeRecorder.java:272) at org.eclipse.emf.transaction.impl.TransactionChangeRecorder.notifyChanged(TransactionChangeRecorder.java:238) at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:380) at org.eclipse.emf.common.notify.impl.NotifyingListImpl.dispatchNotification(NotifyingListImpl.java:267) at org.eclipse.emf.common.notify.impl.NotifyingListImpl.clear(NotifyingListImpl.java:1120) at org.eclipse.emf.ecore.resource.impl.ResourceImpl.doUnload(ResourceImpl.java:1636) at org.eclipse.emf.ecore.xmi.impl.XMLResourceImpl.doUnload(XMLResourceImpl.java:633) at org.eclipse.emf.ecore.resource.impl.ResourceImpl.unload(ResourceImpl.java:1656) at org.eclipse.papyrus.resource.AbstractBaseModel.unload(AbstractBaseModel.java:204) at org.eclipse.papyrus.resource.ModelSet.unload(ModelSet.java:433) at org.eclipse.papyrus.core.resourceloading.OnDemandLoadingModelSet.unload(OnDemandLoadingModelSet.java:58) at org.eclipse.papyrus.core.editor.CoreMultiDiagramEditor.dispose(CoreMultiDiagramEditor.java:646) at org.eclipse.ui.internal.WorkbenchPartReference.doDisposePart(WorkbenchPartReference.java:737) at org.eclipse.ui.internal.EditorReference.doDisposePart(EditorReference.java:327) at org.eclipse.ui.internal.WorkbenchPartReference.dispose(WorkbenchPartReference.java:684) at org.eclipse.ui.internal.WorkbenchPage.disposePart(WorkbenchPage.java:1797) at org.eclipse.ui.internal.WorkbenchPage.handleDeferredEvents(WorkbenchPage.java:1501) at org.eclipse.ui.internal.WorkbenchPage.deferUpdates(WorkbenchPage.java:1485) at org.eclipse.ui.internal.WorkbenchPage.closeEditors(WorkbenchPage.java:1459) at org.eclipse.ui.internal.WorkbenchPage.closeEditor(WorkbenchPage.java:1514) at org.eclipse.ui.internal.EditorPane.doHide(EditorPane.java:61) at org.eclipse.ui.internal.PartStack.close(PartStack.java:537) at org.eclipse.ui.internal.EditorStack.close(EditorStack.java:206) at org.eclipse.ui.internal.PartStack$1.close(PartStack.java:120) at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation$1.handleEvent(TabbedStackPresentation.java:83) at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:269) at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:278) at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder.access$1(DefaultTabFolder.java:1) at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder$1.closeButtonPressed(DefaultTabFolder.java:71) at org.eclipse.ui.internal.presentations.PaneFolder.notifyCloseListeners(PaneFolder.java:631) at org.eclipse.ui.internal.presentations.PaneFolder$3.close(PaneFolder.java:206) at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1598) at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:261) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754) 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(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:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
seems to have disappeared on recent builds. Wait for one more week and other tests before closing.
