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Build Identifier: Version: 3.7.1 Build id: M20110909-1335 Following exception occures when i'm deleting the project. My intial observation is when we delete the project, some how IndexerPreferenceListener is called and it is trying update the "org.eclipse.cdt.core.prefs" file which is normally present in the .settings folder and the file(org.eclipse.cdt.core.prefs) is already deleted from the file system but corresponding resource(IResource) is present in the workspace. There is check for file existence in ProjectPreferences.load() before updating it but the check is based on the IFile which only checks for resource not the actual file present in the file system. org.osgi.service.prefs.BackingStoreException: Exception loading preferences from: /Matrix/.settings/org.eclipse.cdt.core.prefs. at org.eclipse.core.internal.resources.ProjectPreferences.load(ProjectPreferences.java:466) at org.eclipse.core.internal.preferences.EclipsePreferences.create(EclipsePreferences.java:387) at org.eclipse.core.internal.preferences.EclipsePreferences.getChild(EclipsePreferences.java:500) at org.eclipse.core.internal.preferences.EclipsePreferences.internalNode(EclipsePreferences.java:629) at org.eclipse.core.internal.preferences.EclipsePreferences.node(EclipsePreferences.java:757) at org.eclipse.core.resources.ProjectScope.getNode(ProjectScope.java:67) at org.eclipse.cdt.internal.core.pdom.indexer.IndexerPreferences.getProjectPreferences(IndexerPreferences.java:307) at org.eclipse.cdt.internal.core.pdom.indexer.IndexerPreferences.getPreferences(IndexerPreferences.java:280) at org.eclipse.cdt.internal.core.pdom.indexer.IndexerPreferences.get(IndexerPreferences.java:241) at org.eclipse.cdt.internal.core.pdom.indexer.IndexerPreferences.getScope(IndexerPreferences.java:99) at org.eclipse.cdt.internal.core.pdom.indexer.IndexerPreferences.getPreferences(IndexerPreferences.java:271) at org.eclipse.cdt.internal.core.pdom.indexer.IndexerPreferences.get(IndexerPreferences.java:231) at org.eclipse.cdt.internal.ui.editor.CEditor.updateIndexInclusion(CEditor.java:1524) at org.eclipse.cdt.internal.ui.editor.CEditor.access$9(CEditor.java:1521) at org.eclipse.cdt.internal.ui.editor.CEditor$IndexerPreferenceListener.preferenceChange(CEditor.java:1232) at org.eclipse.core.internal.preferences.EclipsePreferences$3.run(EclipsePreferences.java:841) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.preferences.EclipsePreferences.firePreferenceEvent(EclipsePreferences.java:844) at org.eclipse.core.internal.preferences.EclipsePreferences.remove(EclipsePreferences.java:956) at org.eclipse.core.internal.resources.ProjectPreferences.remove(ProjectPreferences.java:500) at org.eclipse.core.internal.preferences.EclipsePreferences.removeNode(EclipsePreferences.java:969) at org.eclipse.core.internal.preferences.EclipsePreferences.removeNode(EclipsePreferences.java:980) at org.eclipse.core.internal.preferences.EclipsePreferences.removeNode(EclipsePreferences.java:980) at org.eclipse.core.internal.resources.ProjectPreferences.removeNode(ProjectPreferences.java:215) at org.eclipse.core.internal.resources.ProjectPreferences.deleted(ProjectPreferences.java:107) at org.eclipse.core.internal.resources.ProjectPreferences.deleted(ProjectPreferences.java:138) at org.eclipse.core.internal.resources.Resource.deleteResource(Resource.java:846) at org.eclipse.core.internal.localstore.DeleteVisitor.delete(DeleteVisitor.java:68) at org.eclipse.core.internal.localstore.DeleteVisitor.visit(DeleteVisitor.java:150) at org.eclipse.core.internal.localstore.UnifiedTree.accept(UnifiedTree.java:110) at org.eclipse.core.internal.localstore.FileSystemResourceManager.delete(FileSystemResourceManager.java:349) at org.eclipse.core.internal.resources.ResourceTree.internalDeleteFolder(ResourceTree.java:352) at org.eclipse.core.internal.resources.ResourceTree.internalDeleteProject(ResourceTree.java:387) at org.eclipse.core.internal.resources.ResourceTree.standardDeleteProject(ResourceTree.java:837) at org.eclipse.core.internal.resources.Resource.unprotectedDelete(Resource.java:1945) at org.eclipse.core.internal.resources.Resource.delete(Resource.java:780) at org.eclipse.core.internal.resources.Project.delete(Project.java:344) at org.eclipse.ltk.core.refactoring.resource.DeleteResourceChange.perform(DeleteResourceChange.java:132) at org.eclipse.ltk.core.refactoring.CompositeChange.perform(CompositeChange.java:278) at org.eclipse.ltk.core.refactoring.CompositeChange.perform(CompositeChange.java:278) at org.eclipse.ltk.core.refactoring.PerformChangeOperation$1.run(PerformChangeOperation.java:258) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2344) at org.eclipse.ltk.core.refactoring.PerformChangeOperation.executeChange(PerformChangeOperation.java:306) at org.eclipse.ltk.internal.ui.refactoring.UIPerformChangeOperation.executeChange(UIPerformChangeOperation.java:92) at org.eclipse.ltk.core.refactoring.PerformChangeOperation.run(PerformChangeOperation.java:218) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2344) at org.eclipse.ltk.internal.ui.refactoring.WorkbenchRunnableAdapter.run(WorkbenchRunnableAdapter.java:87) at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121) Reproducible: Always Steps to Reproduce: 1.Create a simple project with 1 or more source files and build it. 2.After building it, debug the project. 3.Now delete the project. please select the option (Delete the project contents on the disk(cannot be undone)). 4.We can see the exception in the log but not in the UI.
