Description Thorsten Schlathölter 2018-03-08 06:21:30 EST

The ControlledResourceTracker may throw a NPE on rollback. 

The situation is that several resources were added during a transaction. One Resource was added that contained an object (Document) which itself was contained in another container (Project) (so we have a cross resource containment here).

In this situation a rollback occured and the NPE is thrown in the below code snipped because container.eResource() is null.

- oldRoot is the Document which was removed from the resource
- container resolves to the project (which was contained in a different Resource. At the point of NPE the project has already been removed from its own resource)

protected void handleRemove(Resource resource, EObject oldRoot) {
		InternalEObject container = ((InternalEObject) oldRoot).eInternalContainer();
		if (container != null) {
			// Found cross-resource containment
			URI parentURI = container.eIsProxy() ? container.eProxyURI().trimFragment() : container.eResource().getURI();
			if (parentURI != null) {
				unmap(resource.getURI(), parentURI);
			}
		}
	}