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1) Create some form (JFrame) 2) add JButton there 3) Generate add actionPerformed(java.awt.event.ActionEvent evt) {} event handler there (popup menu on JButton > Events > Actions...) 4) write System.out.println (evt); 5) try to rename evt variable (Ctrl-R) > second usage of evt variable is renamed only. Code is broken...
This is one of known limitations of refactoring support in GUI builder. See issue 106831 and section Rename event handler parameter' in http://wiki.netbeans.org/GUIBuilderRefactoring *** This issue has been marked as a duplicate of 106831 ***