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Renaming was invoked from the project explorer window. I clicked the Rename button not the Preview button. But when the exception reporter had focus, I could see the left pane only of the preview window which is unexpected. After renaming, all instances of the class name in the editor are renamed but the file name is still old so the file has errors. I then fixed the class names in the editor and saved the class in its old state and repeated the rename action which succeeded. See http://statistics.netbeans.org/analytics/detail.do?id=190211 See bug 214898
*** This bug has been marked as a duplicate of bug 214898 ***