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My steps: 1. Create a new text file in a simple unshared project. 2. Paste in a large block of XML and save. 3. Insert a newline at the end of the file and save. 4. Undo. The following NPE was logged. I wasn't using the Find/Replace dialog at this point, though I had been using it earlier. Also, besides the stack trace entry, there was a separate entry in the log which was very strange. It was just the message "Abnormal Workbench Condition" with the string "java.lang.NullPointerException" with no stack trace. java.lang.NullPointerException at org.eclipse.jface.text.DefaultPositionUpdater.update(DefaultPositionUpdater.java:233) at org.eclipse.jface.text.AbstractDocument.updatePositions(AbstractDocument.java:1133) at org.eclipse.jface.text.AbstractDocument.updateDocumentStructures(AbstractDocument.java:644) at org.eclipse.jface.text.AbstractDocument.fireDocumentChanged(AbstractDocument.java:720) at org.eclipse.jface.text.AbstractDocument.replace(AbstractDocument.java:1081) at org.eclipse.core.internal.filebuffers.SynchronizableDocument.replace(SynchronizableDocument.java:147) at org.eclipse.jface.text.AbstractDocument.replace(AbstractDocument.java:1091) at org.eclipse.core.internal.filebuffers.SynchronizableDocument.replace(SynchronizableDocument.java:133) at org.eclipse.jface.text.FindReplaceDocumentAdapter.findReplace(FindReplaceDocumentAdapter.java:185) at org.eclipse.jface.text.FindReplaceDocumentAdapter.replace(FindReplaceDocumentAdapter.java:278) at org.eclipse.jface.text.TextViewer$FindReplaceTarget.replaceSelection(TextViewer.java:800) at org.eclipse.ui.texteditor.FindReplaceTarget.replaceSelection(FindReplaceTarget.java:141) at org.eclipse.ui.texteditor.FindReplaceDialog.replaceSelection(FindReplaceDialog.java:822) at org.eclipse.ui.texteditor.FindReplaceDialog.performReplaceSelection(FindReplaceDialog.java:1297) at org.eclipse.ui.texteditor.FindReplaceDialog.access$28(FindReplaceDialog.java:1286) at org.eclipse.ui.texteditor.FindReplaceDialog$2.widgetSelected(FindReplaceDialog.java:314) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:227) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1101) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3319) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2971) 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 org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106) 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(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) 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) at org.eclipse.equinox.launcher.Main.main(Main.java:1144)
Which build? Which editor? I assume the text editor. I cannot reproduce using your steps with plain Eclipse SDK I20071030-0010 and actually those steps can never map to the posted .log entry ;-) Can you still reproduce? If so, please post the full .log and the corresponding steps. Thanks.
*** This bug has been marked as a duplicate of bug 150934 ***
