java.lang.OutOfMemoryError: Java heap space
   at org.netbeans.editor.DocumentContent.enlargeGap(DocumentContent.java:259)
   at org.netbeans.editor.DocumentContent.insertText(DocumentContent.java:297)
   at org.netbeans.editor.DocumentContent$Edit.undoOrRedo(DocumentContent.java:445)
   at org.netbeans.editor.DocumentContent$Edit.<init>(DocumentContent.java:389)
   at org.netbeans.editor.DocumentContent.insertString(DocumentContent.java:112)
   at org.netbeans.editor.BaseDocument.insertString(BaseDocument.java:768)
   at org.netbeans.editor.Analyzer.initialRead(Analyzer.java:547)
   at org.netbeans.editor.BaseDocument.read(BaseDocument.java:1491)
   at org.netbeans.editor.BaseKit.read(BaseKit.java:698)
   at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView.setSource2(EditableDiffView.java:1109)
   at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView.access$600(EditableDiffView.java:114)
   at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView$1.run(EditableDiffView.java:267)
   at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView.<init>(EditableDiffView.java:307)
   at org.netbeans.modules.diff.builtin.DefaultDiffControllerProvider.createEnhancedDiffController(DefaultDiffControllerProvider.java:67)
   at org.netbeans.api.diff.DiffController.createEnhanced(DiffController.java:112)
   at org.netbeans.modules.diff.builtin.SingleDiffPanel.refreshController(SingleDiffPanel.java:145)
   at org.netbeans.modules.diff.builtin.SingleDiffPanel.initMyComponents(SingleDiffPanel.java:134)
   at org.netbeans.modules.diff.builtin.SingleDiffPanel.<init>(SingleDiffPanel.java:104)
   at org.netbeans.modules.diff.DiffAction.performAction(DiffAction.java:251)
   at org.netbeans.modules.diff.DiffAction$1.run(DiffAction.java:194)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
   at com.sun.embeddedswing.EmbeddedEventQueue.dispatchEvent(EmbeddedEventQueue.java:448)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)