java.lang.NullPointerException
   at org.netbeans.api.java.source.ElementHandle.resolve(ElementHandle.java:118)
   at org.netbeans.api.java.source.TreePathHandle$TreeDelegate.resolveElement(TreePathHandle.java:530)
   at org.netbeans.api.java.source.TreePathHandle.resolveElement(TreePathHandle.java:162)
   at org.netbeans.modules.refactoring.java.plugins.JavaWhereUsedQueryPlugin$FindTask.run(JavaWhereUsedQueryPlugin.java:574)
   at org.netbeans.modules.refactoring.java.plugins.JavaWhereUsedQueryPlugin$FindTask.run(JavaWhereUsedQueryPlugin.java:548)
   at org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:501)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:586)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:130)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:114)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:181)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:178)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:153)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:335)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:118)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:67)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:178)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:81)
   at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:451)
   at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:422)
   at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.processFiles(JavaRefactoringPlugin.java:319)
   at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.processFiles(JavaRefactoringPlugin.java:263)
   at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.queryFiles(JavaRefactoringPlugin.java:253)
   at org.netbeans.modules.refactoring.java.plugins.JavaWhereUsedQueryPlugin.prepare(JavaWhereUsedQueryPlugin.java:362)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare2(AbstractRefactoring.java:417)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsPrepare(AbstractRefactoring.java:401)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.prepare(AbstractRefactoring.java:212)
   at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$Prepare$2.run(ParametersPanel.java:1061)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:278)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)