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It's difficult to explain how to reproduce this bug, so I provide an example in the attachement. (Explanations in the next comment).
Created attachment 199350 [details] An exemple to reproduce this bug Steps to reproduce : 1/ Compare the 2 uml files 2/ Expand the Model model 3/ Expand the Class Class0 4/ Select the property You get the following exception : java.lang.NullPointerException at org.eclipse.emf.edit.provider.ComposedAdapterFactory.adapt(ComposedAdapterFactory.java:340) at org.eclipse.emf.edit.provider.ComposedAdapterFactory.adapt(ComposedAdapterFactory.java:277) at org.eclipse.emf.compare.util.AdapterUtils.adapt(AdapterUtils.java:55) at org.eclipse.emf.compare.util.AdapterUtils.getItemProviderImage(AdapterUtils.java:79) at org.eclipse.emf.compare.diff.provider.UpdateReferenceItemProvider.getImage(UpdateReferenceItemProvider.java:58) at org.eclipse.emf.edit.ui.provider.AdapterFactoryLabelProvider.getImage(AdapterFactoryLabelProvider.java:336) at org.eclipse.emf.compare.ui.viewer.structure.ModelStructureMergeViewer$ModelStructureLabelProvider.getImage(ModelStructureMergeViewer.java:440) at org.eclipse.jface.viewers.WrappedViewerLabelProvider.getImage(WrappedViewerLabelProvider.java:117) at org.eclipse.jface.viewers.WrappedViewerLabelProvider.update(WrappedViewerLabelProvider.java:165) at org.eclipse.jface.viewers.ViewerColumn.refresh(ViewerColumn.java:152) at org.eclipse.jface.viewers.AbstractTreeViewer.doUpdateItem(AbstractTreeViewer.java:938) at org.eclipse.jface.viewers.AbstractTreeViewer$UpdateItemSafeRunnable.run(AbstractTreeViewer.java:106) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175) at org.eclipse.jface.viewers.AbstractTreeViewer.doUpdateItem(AbstractTreeViewer.java:1018) at org.eclipse.jface.viewers.StructuredViewer$UpdateItemSafeRunnable.run(StructuredViewer.java:485) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175) at org.eclipse.jface.viewers.StructuredViewer.updateItem(StructuredViewer.java:2167) at org.eclipse.jface.viewers.AbstractTreeViewer.createTreeItem(AbstractTreeViewer.java:833) at org.eclipse.jface.viewers.AbstractTreeViewer$1.run(AbstractTreeViewer.java:808) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:782) at org.eclipse.jface.viewers.TreeViewer.createChildren(TreeViewer.java:644) at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpandToLevel(AbstractTreeViewer.java:1755) at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpandToLevel(AbstractTreeViewer.java:1765) at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpandToLevel(AbstractTreeViewer.java:1765) at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpandToLevel(AbstractTreeViewer.java:1765) at org.eclipse.jface.viewers.AbstractTreeViewer.internalExpandToLevel(AbstractTreeViewer.java:1765) at org.eclipse.jface.viewers.AbstractTreeViewer.expandToLevel(AbstractTreeViewer.java:1060) at org.eclipse.jface.viewers.AbstractTreeViewer.expandToLevel(AbstractTreeViewer.java:1041) at org.eclipse.jface.viewers.AbstractTreeViewer.expandAll(AbstractTreeViewer.java:1030) at org.eclipse.emf.compare.ui.viewer.structure.ModelStructureMergeViewer$ConfigurationPropertyListener.propertyChange(ModelStructureMergeViewer.java:385) at org.eclipse.compare.CompareConfiguration.fireChange(CompareConfiguration.java:367) at org.eclipse.compare.CompareConfiguration.setProperty(CompareConfiguration.java:398) at org.eclipse.emf.compare.ui.viewer.content.part.ModelContentMergeTabFolder.navigateToDiff(ModelContentMergeTabFolder.java:257) at org.eclipse.emf.compare.ui.viewer.content.ModelContentMergeViewer.setSelection(ModelContentMergeViewer.java:355) at org.eclipse.emf.compare.ui.viewer.content.ModelContentMergeViewer.setSelection(ModelContentMergeViewer.java:341) at org.eclipse.emf.compare.ui.viewer.content.part.ModelContentMergeTabFolder$7.widgetSelected(ModelContentMergeTabFolder.java:560) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) 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:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410) at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
(In reply to comment #1) > Created attachment 199350 [details] (1) I, Vincent Lorenzo, wrote 100% of the code I've provided. (2) This code contains no cryptography (3) I have the right to contribute the code to Eclipse. (4) I contribute the content under the EPL.
This is an application of the "generic use case" that I describe in bug 351593, comment #1 . It will require the same kind of fix.
This has to be confirmed now with the changes for bug 351593 applied.
I just did the check with the current master tree (eefaf5e570f20c2b5ec1b6304b0d84c195b7023d) and everything works as expected.
Thanks Cedric, closing now.
