Bug 220697 [Undo] Exceptions when validating a delete operation
Build ID: M20071023-1652 Steps To Reproduce: It is hard to reproduce. But it happens from time to time. From our editor, when user saves the file, we write to an IFile. We get the exception shown below. We are using File.setContents(stream, true, true, progressmonitor); So we are setting keep history to true and we are using force flag. More information: Problems occurred when invoking code from plug-in: "org.eclipse.core.resources". java.lang.NullPointerException at org.eclipse.ui.ide.undo.AbstractResourcesOperation.computeCreateStatus(AbstractResourcesOperation.java:164) at org.eclipse.ui.ide.undo.DeleteResourcesOperation.computeUndoableStatus(DeleteResourcesOperation.java:156) at org.eclipse.ui.internal.ide.undo.WorkspaceUndoMonitor.checkOperationHistory(WorkspaceUndoMonitor.java:235) at org.eclipse.ui.internal.ide.undo.WorkspaceUndoMonitor.access$4(WorkspaceUndoMonitor.java:209) at org.eclipse.ui.internal.ide.undo.WorkspaceUndoMonitor$1.resourceChanged(WorkspaceUndoMonitor.java:132) at org.eclipse.core.internal.events.NotificationManager$2.run(NotificationManager.java:282) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:276) at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:148) at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:311) at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1018) at org.eclipse.core.internal.resources.File.setContents(File.java:363) at org.eclipse.core.internal.resources.File.setContents(File.java:458) at com.fnfr.documents.helpers.DocumentHelper.writeToDocument(DocumentHelper.java:216) at com.fnfr.documents.helpers.DocumentHelper.writeToDocument(DocumentHelper.java:223) at com.fnfr.svt.ui.common.editors.FanfareFormEditor.saveDocumentToFile(FanfareFormEditor.java:979) at com.fnfr.svt.ui.common.editors.FanfareFormEditor$5.doPersistence(FanfareFormEditor.java:810) at com.fnfr.svt.ui.common.interfaces.AbstractPersistenceDelegate.persist(AbstractPersistenceDelegate.java:34) at com.fnfr.svt.ui.common.editors.FanfareFormEditor.managePersistence(FanfareFormEditor.java:935) at com.fnfr.svt.ui.common.editors.FanfareFormEditor.doSave(FanfareFormEditor.java:830) at org.eclipse.ui.internal.SaveableHelper$1.run(SaveableHelper.java:143) at org.eclipse.ui.internal.SaveableHelper$4.run(SaveableHelper.java:266) at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:369) at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:313) at org.eclipse.jface.window.ApplicationWindow$1.run(ApplicationWindow.java:758) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67) at org.eclipse.jface.window.ApplicationWindow.run(ApplicationWindow.java:755) at org.eclipse.ui.internal.WorkbenchWindow.run(WorkbenchWindow.java:2451) at org.eclipse.ui.internal.SaveableHelper.runProgressMonitorOperation(SaveableHelper.java:274) at org.eclipse.ui.internal.SaveableHelper.runProgressMonitorOperation(SaveableHelper.java:253) at org.eclipse.ui.internal.SaveableHelper.savePart(SaveableHelper.java:148) at org.eclipse.ui.internal.EditorManager.savePart(EditorManager.java:1345) at org.eclipse.ui.internal.WorkbenchPage.savePart(WorkbenchPage.java:3184) at org.eclipse.ui.internal.WorkbenchPage.saveEditor(WorkbenchPage.java:3197) at org.eclipse.ui.internal.SaveAction.run(SaveAction.java:73) at org.eclipse.jface.action.Action.runWithEvent(Action.java:498) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:545) at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:490) at org.eclipse.jface.action.ActionContributionItem$6.handleEvent(ActionContributionItem.java:443) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3682) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3293) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219) at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at com.fnfr.svt.rcp.Application.runWorkbench(Application.java:144) at com.fnfr.svt.rcp.Application.start(Application.java:132) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:153) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176) 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:504) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:443) at org.eclipse.equinox.launcher.Main.run(Main.java:1169)
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/ide/undo/AbstractWorkspaceOperation.java
public void setQuietCompute(boolean quiet) {
		quietCompute = quiet;
	}
	/*
	 * @see java.lang.Object#toString()
	 */
	public String toString() {
		StringBuffer text = new StringBuffer(super.toString());
		text.append("\n"); 
		text.append(this.getClass().getName());
		appendDescriptiveText(text);
		return text.toString();
	}
	/**
	 * Append any descriptive text to the specified string buffer to be shown in
	 * the receiver's {@link #toString()} text.
	 * <p>Note that this method is not intend to be subclassed by clients.
	 * 
	 * @param text
	 *            the StringBuffer on which to append the text
	 */
	protected void appendDescriptiveText(StringBuffer text) {
		text.append(" resources: "); 
		text.append(resources);
		text.append('\'');
	}
	/**
	 * Return the shell described by the specified adaptable, or the active
	 * shell if no shell has been specified in the adaptable.
	 *