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NullPointerExceptions in ControlledResourceTracker while rolling back transactions [message #1770237]

Wed, 09 August 2017 09:59

Marc-Florian Wendland

Messages: 81
Registered: January 2013

Member

Hi all,

I have encountered an unexpected behavior of a Papyrus component (ControlledResourceTracker) while rolling back a transaction that executed a transformation. The transformation produced a UML PSM from a UML PIM that is contained in the very same ResourceSet as the PIM.

When an exception occurs during the execution of the transactional command (there are more steps than just creating the PSM, so happens that the PSM is correctly generated and even executed, but another steps in the transaction may cause the transaction to rollback) the transaction framework tries to rollback the transaction.

So far, so good. Unfortunately, the rollback aborts with a NullPointerException thrown by the ControlledResourceTracker. You can find the exception below. Does anyone else encountered this situation with the ControlledResourceTracker?

java.lang.reflect.InvocationTargetException
at de.fraunhofer.fokus.utest.papyrus.ui.handler.testdesign.ExecuteTestDesignDirective$1.run(ExecuteTestDesignDirective.java:122)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:119)
Caused by: java.lang.NullPointerException
at org.eclipse.papyrus.infra.emf.readonly.ControlledResourceTracker.handleRemove(ControlledResourceTracker.java:228)
at org.eclipse.papyrus.infra.emf.readonly.ControlledResourceTracker.notifyChanged(ControlledResourceTracker.java:303)
at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:374)
at org.eclipse.emf.common.notify.impl.NotifyingListImpl.dispatchNotification(NotifyingListImpl.java:261)
at org.eclipse.emf.common.notify.impl.NotifyingListImpl.remove(NotifyingListImpl.java:713)
at org.eclipse.emf.common.util.ECollections.setEList(ECollections.java:238)
at org.eclipse.emf.ecore.change.impl.ResourceChangeImpl.process(ResourceChangeImpl.java:305)
at org.eclipse.emf.ecore.change.impl.ResourceChangeImpl.apply(ResourceChangeImpl.java:282)
at org.eclipse.emf.ecore.change.impl.ResourceChangeImpl.apply(ResourceChangeImpl.java:267)
at org.eclipse.emf.ecore.change.impl.ChangeDescriptionImpl.apply(ChangeDescriptionImpl.java:306)
at org.eclipse.emf.transaction.util.CompositeChangeDescription.apply(CompositeChangeDescription.java:135)
at org.eclipse.emf.transaction.impl.TransactionImpl.doRollback(TransactionImpl.java:570)
at org.eclipse.emf.transaction.impl.TransactionImpl.rollback(TransactionImpl.java:547)
at org.eclipse.emf.workspace.AbstractEMFOperation.rollback(AbstractEMFOperation.java:630)
at org.eclipse.emf.workspace.AbstractEMFOperation.execute(AbstractEMFOperation.java:187)
at org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:516)
at de.fraunhofer.fokus.utest.papyrus.ui.handler.testdesign.ExecuteTestDesignDirective$1.run(ExecuteTestDesignDirective.java:106)
... 1 more

Best regards,
Marc-Florian

Attachment: papyr_controlledresourcetracker.PNG
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Re: NullPointerExceptions in ControlledResourceTracker while rolling back transactions [message #1770366 is a reply to message #1770237]

Thu, 10 August 2017 12:15

Christian Damus

Messages: 1206
Registered: July 2009
Location: Canada

Senior Member

Hi, Marc-Florian,

This is pretty clearly a bug: the ControlledResourceTracker should be able to handle the case that the object in question is not in a resource, which the debugger here shows to be the case.

Would you mind reporting this in bugzilla?

Thanks,
Christian

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Re: NullPointerExceptions in ControlledResourceTracker while rolling back transactions [message #1770368 is a reply to message #1770366]

Thu, 10 August 2017 12:22

Marc-Florian Wendland

Messages: 81
Registered: January 2013

Member

Dear Christian,

thanks for the quick answer. I will file a bug, not a problem at all. I will come back and post the link to the filed bug later.

Best regards and thanks again,
Marc-Florian

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Re: NullPointerExceptions in ControlledResourceTracker while rolling back transactions [message #1773459 is a reply to message #1770368]

Thu, 28 September 2017 07:19

Marc-Florian Wendland

Messages: 81
Registered: January 2013

Member

Hi Christian,

I eventually filed a report against the bug concerning the ControlledResourceTracker. You can find it here: https://bugs.eclipse.org/bugs/show_bug.cgi?id=525297

Best regards,
Marc-Florian

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