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Created attachment 273125 [details] projects to reproduce The following NPE can occur mysteriously: Thread [main] (Suspended (exception NullPointerException)) owns: RunnableLock (id=2342) PaletteManagerImpl.setLayerVisibility(Layer, boolean) line: 510 PaletteManagerImpl.updatePaletteForDiagramWithLayer(DiagramDescription, Session, DDiagram) line: 361 PaletteManagerImpl.updatePalette(DiagramDescription, Session, DDiagram) line: 295 PaletteManagerImpl.updatePalette(Diagram) line: 263 PaletteManagerImpl.updatePalette(Diagram, boolean) line: 222 PaletteManagerImpl.update(Diagram, boolean) line: 184 DDiagramEditorSessionListenerDelegate.reloadPalette(PaletteManager, Diagram, boolean) line: 220 DDiagramEditorSessionListenerDelegate.run() line: 117 RunnableLock.run(Display) line: 37 UISynchronizer(Synchronizer).runAsyncMessages(boolean) line: 182 Display.runAsyncMessages(boolean) line: 4213 Display.readAndDispatch() line: 3820 ModalContext$ModalContextThread.block() line: 165 ModalContext.run(IRunnableWithProgress, boolean, IProgressMonitor, Display) line: 369 ProgressMonitorDialog.run(boolean, boolean, IRunnableWithProgress) line: 483 CustomSiriusEditor.doSave(IProgressMonitor) line: 445 SaveableHelper.lambda$0(ISaveablePart, IProgressMonitor) line: 154 520693151.run(IProgressMonitor) line: not available SaveableHelper.lambda$3(IRunnableWithProgress, boolean[], IProgressMonitor) line: 271 937656362.run(IProgressMonitor) line: not available ModalContext.runInCurrentThread(IRunnableWithProgress, IProgressMonitor) line: 437 ModalContext.run(IRunnableWithProgress, boolean, IProgressMonitor, Display) line: 353 WorkbenchWindow$14.run() line: 2195 BusyIndicator.showWhile(Display, Runnable) line: 70 WorkbenchWindow.run(boolean, boolean, IRunnableWithProgress) line: 2191 SaveableHelper.runProgressMonitorOperation(String, IRunnableWithProgress, IRunnableContext, IShellProvider) line: 278 SaveableHelper.runProgressMonitorOperation(String, IRunnableWithProgress, IWorkbenchWindow) line: 259 SaveableHelper.savePart(ISaveablePart, IWorkbenchPart, IWorkbenchWindow, boolean) line: 158 WorkbenchPage.saveSaveable(ISaveablePart, IWorkbenchPart, boolean, boolean) line: 3917 WorkbenchPage.saveEditor(IEditorPart, boolean) line: 3931 SaveHandler.execute(ExecutionEvent) line: 54 HandlerProxy.execute(ExecutionEvent) line: 291 E4HandlerProxy.execute(IEclipseContext, Map, Event, IEvaluationContext) line: 92 GeneratedMethodAccessor58.invoke(Object, Object[]) line: not available DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43 Method.invoke(Object, Object...) line: 498 MethodRequestor.execute() line: 55 InjectorImpl.invokeUsingClass(Object, Class<?>, Class<Annotation>, Object, PrimaryObjectSupplier, PrimaryObjectSupplier, boolean, boolean, boolean) line: 305 InjectorImpl.invoke(Object, Class<Annotation>, Object, PrimaryObjectSupplier, PrimaryObjectSupplier) line: 239 ContextInjectionFactory.invoke(Object, Class<Annotation>, IEclipseContext, IEclipseContext, Object) line: 132 WorkbenchHandlerServiceHandler(HandlerServiceHandler).execute(ExecutionEvent) line: 152 Command.executeWithChecks(ExecutionEvent) line: 494 ParameterizedCommand.executeWithChecks(Object, Object) line: 487 HandlerServiceImpl.executeHandler(ParameterizedCommand, IEclipseContext) line: 210 KeyBindingDispatcher.executeCommand(ParameterizedCommand, Event) line: 287 KeyBindingDispatcher.press(List<KeyStroke>, Event) line: 527 KeyBindingDispatcher.processKeyEvent(List<KeyStroke>, Event) line: 577 KeyBindingDispatcher.filterKeySequenceBindings(Event) line: 385 KeyBindingDispatcher.access$0(KeyBindingDispatcher, Event) line: 331 KeyBindingDispatcher$KeyDownFilter.handleEvent(Event) line: 88 EventTable.sendEvent(Event) line: 86 Display.filterEvent(Event) line: 1271 Tree(Widget).sendEvent(Event) line: 1078 Tree(Widget).sendEvent(int, Event, boolean) line: 1103 Tree(Widget).sendEvent(int, Event) line: 1088 Tree(Widget).sendKeyEvent(int, int, long, long, Event) line: 1130 Tree(Widget).sendKeyEvent(int, int, long, long) line: 1126 Tree(Widget).wmChar(long, long, long) line: 1547 Tree(Control).WM_CHAR(long, long) line: 4962 Tree.WM_CHAR(long, long) line: 6193 Tree(Control).windowProc(long, int, long, long) line: 4843 Tree.windowProc(long, int, long, long) line: 6188 Display.windowProc(long, long, long, long) line: 5178 OS.DispatchMessageW(MSG) line: not available [native method] OS.DispatchMessage(MSG) line: 2560 Display.readAndDispatch() line: 3815 PartRenderingEngine$5.run() line: 1150 Realm.runWithDefault(Realm, Runnable) line: 336 PartRenderingEngine.run(MApplicationElement, IEclipseContext) line: 1039 E4Workbench.createAndRunUI(MApplicationElement) line: 153 Workbench.lambda$3(Display, WorkbenchAdvisor, int[]) line: 680 1663271865.run() line: not available Realm.runWithDefault(Realm, Runnable) line: 336 Workbench.createAndRunWorkbench(Display, WorkbenchAdvisor) line: 594 PlatformUI.createAndRunWorkbench(Display, WorkbenchAdvisor) line: 148 IDEApplication.start(IApplicationContext) line: 151 EclipseAppHandle.run(Object) line: 196 EclipseAppLauncher.runApplication(Object) line: 134 EclipseAppLauncher.start(Object) line: 104 EclipseStarter.run(Object) line: 388 EclipseStarter.run(String[], Runnable) line: 243 NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method] NativeMethodAccessorImpl.invoke(Object, Object[]) line: 62 DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43 Method.invoke(Object, Object...) line: 498 Main.invokeFramework(String[], URL[]) line: 653 Main.basicRun(String[]) line: 590 Main.run(String[]) line: 1499 Main.main(String[]) line: 1472 The paletteRoot is set to null between org.eclipse.sirius.diagram.ui.tools.internal.palette.PaletteManagerImpl.updatePalette(Diagram, boolean) and org.eclipse.sirius.diagram.ui.tools.internal.palette.PaletteManagerImpl.setLayerVisibility(Layer, boolean) The reproduction seems random and happened sometime when doing odesign modification, save and arrange-all. Steps to reproduce: -Import basic family projects excepted sample and design - Launch a runtime - Import design and sample - Open the odesign and a new person diagram. Put the view next to the other. - Add an ELK layered layout configuration, save, do an arrange-all. - Add Direction option with left value and save and do an arrange-all. - Do that for other direction. - Add a node spacing option with value 100, save and do arrange-all. - Repeat these kind of changes and sometime you may have the NPE.
Created attachment 273380 [details] Different NPE I was not able to reproduce your exception. However, I had the following NPE in attachment if I remove the direction submodel element (DOWN, UP, LEFT or RIGHT) and launch an arrange all
This problem seems fixed with bug 531919. Indeed, the code of the stack has been changed with this bugzilla and I not reproduced the problem in Sirius 6.3.1.
Available in Sirius 6.3.1 (part of Eclipse 2020-06). See https://wiki.eclipse.org/Sirius/6.3.1 for details on the release.
