java.lang.NullPointerException
   at org.netbeans.api.java.source.ElementHandle.resolve(ElementHandle.java:141)
   at org.netbeans.api.java.source.TreePathHandle$ElementDelegate.resolveElement(TreePathHandle.java:738)
   at org.netbeans.api.java.source.TreePathHandle.resolveElement(TreePathHandle.java:187)
   at org.netbeans.modules.refactoring.java.plugins.JavaWhereUsedQueryPlugin.preCheck(JavaWhereUsedQueryPlugin.java:134)
   at org.netbeans.modules.refactoring.java.plugins.JavaWhereUsedQueryPlugin.checkParameters(JavaWhereUsedQueryPlugin.java:460)
   at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin$WorkingTask.run(JavaRefactoringPlugin.java:421)
   at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin$WorkingTask.run(JavaRefactoringPlugin.java:394)
   at org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:523)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:609)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:153)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:137)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:204)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:201)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:90)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:201)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:104)
   at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:473)
   at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:444)
   at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin$WorkingTask.run(JavaRefactoringPlugin.java:407)
   at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin$WorkingTask.access$100(JavaRefactoringPlugin.java:394)
   at org.netbeans.modules.refactoring.java.spi.JavaRefactoringPlugin.checkParameters(JavaRefactoringPlugin.java:146)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.pluginsCheckParams(AbstractRefactoring.java:510)
   at org.netbeans.modules.refactoring.api.AbstractRefactoring.checkParameters(AbstractRefactoring.java:269)
   at org.netbeans.modules.refactoring.java.ui.WhereUsedQueryUI.setParameters(WhereUsedQueryUI.java:154)
   at org.netbeans.modules.refactoring.spi.impl.ParametersPanel$Prepare.run(ParametersPanel.java:1060)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)