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Parent container going null in SiriusCanonicalLayoutCommand class [message #1806878]

Fri, 17 May 2019 04:55

Nagashree KN

Messages: 32
Registered: September 2018

Member

Hi,

I am using Xtext and Sirius combination. i am editing and saving the contents from xtext . So in Sirius to arrange the elements it will be executing executeLayoutDueToExternalChanges() method in SiriusCanonicalLayoutCommand class. my problem is at the time of class instantiation diagramEditPart variable is holding parent value. but while executing the executeLayoutDueToExternalChanges() method, the varible diagramEditPart will have parent as null. because of this arranging of elements is not happening and i will get Nullpointer exception. and my stack trace is give below-

!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.NullPointerException
at org.eclipse.gef.editparts.AbstractEditPart.createChild(AbstractEditPart.java:269)
at org.eclipse.gef.editparts.AbstractEditPart.refreshChildren(AbstractEditPart.java:780)
at org.eclipse.gef.editparts.AbstractEditPart.refresh(AbstractEditPart.java:726)
at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:644)
at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.access$3(GraphicalEditPart.java:1)
at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart$3.run(GraphicalEditPart.java:861)
at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.runExclusive(TransactionalEditingDomainImpl.java:328)
at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.refresh(GraphicalEditPart.java:851)
at org.eclipse.gmf.runtime.diagram.ui.commands.DeferredLayoutCommand$1.run(DeferredLayoutCommand.java:146)
at org.eclipse.gmf.runtime.diagram.ui.util.EditPartUtil.synchronizeRunnableToMainThread(EditPartUtil.java:111)
at org.eclipse.gmf.runtime.diagram.ui.commands.DeferredLayoutCommand.doExecuteWithResult(DeferredLayoutCommand.java:186)
at org.eclipse.gmf.runtime.emf.commands.core.command.AbstractTransactionalCommand.doExecute(AbstractTransactionalCommand.java:247)
at org.eclipse.emf.workspace.AbstractEMFOperation.execute(AbstractEMFOperation.java:150)
at org.eclipse.gmf.runtime.diagram.ui.commands.ICommandProxy.execute(ICommandProxy.java:68)
at org.eclipse.gef.commands.CompoundCommand.execute(CompoundCommand.java:129)
at org.eclipse.sirius.diagram.ui.internal.refresh.layout.SiriusCanonicalLayoutCommand.executeLayoutDueToExternalChanges(SiriusCanonicalLayoutCommand.java:109)
at org.eclipse.sirius.diagram.ui.internal.refresh.layout.SiriusCanonicalLayoutCommand.access$3(SiriusCanonicalLayoutCommand.java:106)
at org.eclipse.sirius.diagram.ui.internal.refresh.layout.SiriusCanonicalLayoutCommand$1.run(SiriusCanonicalLayoutCommand.java:92)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:37)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4213)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3820)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1150)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1039)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:680)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:594)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:151)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
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:653)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)
at org.eclipse.equinox.launcher.Main.run(Main.java:1499)
at org.eclipse.equinox.launcher.Main.main(Main.java:1472)

I have attached the screenshots.
Please any one help me to solve this.
Thanks in advance!