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We're not protecting ourselves when merging fragments into the model. It's possible for a fragment to store an invalid object in a feature. Bug 369975 provides one recipe for creating such a fragment. The resulting fragment, when loaded, causes an ArrayStoreException as it tries to store an HandlerImpl into an array of MToolBarContribution: Daemon Thread [Thread-1] (Suspended (exception ArrayStoreException)) EObjectContainmentEList<E>(BasicEList<E>).assign(int, E) line: 124 EObjectContainmentEList<E>(BasicEList<E>).addAllUnique(int, Collection<? extends E>) line: 514 EObjectContainmentEList<E>(NotifyingListImpl<E>).doAddAllUnique(int, Collection<? extends E>) line: 506 EObjectContainmentEList<E>(NotifyingListImpl<E>).addAllUnique(int, Collection<? extends E>) line: 478 EObjectContainmentEList<E>(NotifyingListImpl<E>).addAllUnique(Collection<? extends E>) line: 406 EObjectContainmentEList<E>(AbstractEList<E>).addAll(Collection<? extends E>) line: 374 ModelUtils.merge(MApplicationElement, EStructuralFeature, List<MApplicationElement>, String) line: 124 StringModelFragmentImpl.merge(MApplication) line: 288 ModelAssembler.processModel() line: 164 ResourceHandler.loadMostRecentModel() line: 246 E4Application.loadApplicationModel(IApplicationContext, IEclipseContext) line: 349 E4Application.createE4Workbench(IApplicationContext, Display) line: 210 Basically E4's ModelUtils.merge() should be checking that the elements being added are compatible with the feature.
This bug hasn't had any activity in quite some time. Maybe the problem got resolved, was a duplicate of something else, or became less pressing for some reason - or maybe it's still relevant but just hasn't been looked at yet. If you have further information on the current state of the bug, please add it. The information can be, for example, that the problem still occurs, that you still want the feature, that more information is needed, or that the bug is (for whatever reason) no longer relevant. If the bug is still relevant, please remove the "stalebug" whiteboard tag.
