java.lang.NullPointerException
        at java.util.regex.Matcher.getTextLength(Matcher.java:1140)
        at java.util.regex.Matcher.reset(Matcher.java:291)
        at java.util.regex.Matcher.<init>(Matcher.java:211)
        at java.util.regex.Pattern.matcher(Pattern.java:888)
        at org.netbeans.modules.compapp.test.ui.DiffStreamSource.getXMLEncoding(DiffStreamSource.java:162)
        at org.netbeans.modules.compapp.test.ui.DiffStreamSource.createReader(DiffStreamSource.java:134)
        at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView.setSource2(EditableDiffView.java:881)
        at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView.access$500(EditableDiffView.java:99)
        at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView$.run(EditableDiffView.java:218)
        at org.netbeans.modules.diff.builtin.visualizer.editable.EditableDiffView.<init>(EditableDiffView.java:249)
        at org.netbeans.modules.diff.builtin.DefaultDiff.createDiff(DefaultDiff.java:137)
        at org.netbeans.modules.compapp.test.ui.DiffTopComponent.refreshView(DiffTopComponent.java:276)
        at org.netbeans.modules.compapp.test.ui.DiffTopComponent.refreshView(DiffTopComponent.java:239)
        at org.netbeans.modules.compapp.test.ui.TestcaseNode.refreshDiffTopComponent(TestcaseNode.java:558)
        at org.netbeans.modules.compapp.test.ui.actions.AbstractTestCaseExecutionAction$$.run(AbstractTestCaseExecutionAction.java:212)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)
        at java.awt.Dialog$.run(Dialog.java:1047)
        at java.awt.Dialog$.run(Dialog.java:1099)
        at java.security.AccessController.doPrivileged(AccessController.java:0)
        at java.awt.Dialog.show(Dialog.java:1097)
        at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:867)
        at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:901)
        at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:889)
        at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:109)
        at org.openide.util.Mutex$AWTWorker.run(Mutex.java:1370)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        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)