java.lang.ClassCastException: com.sun.tools.javac.tree.JCTree$JCCase cannot be cast to com.sun.source.tree.BlockTree
   at org.netbeans.modules.java.hints.introduce.IntroduceFieldFix$Worker.initializeFromMethod(IntroduceFieldFix.java:224)
   at org.netbeans.modules.java.hints.introduce.IntroduceFieldFix$Worker.run(IntroduceFieldFix.java:372)
   at org.netbeans.modules.java.hints.introduce.IntroduceFieldFix$Worker.run(IntroduceFieldFix.java:190)
   at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:694)
   at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:684)
   at org.netbeans.api.java.source.JavaSource$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.api.java.source.JavaSource.runModificationTask(JavaSource.java:705)
   at org.netbeans.modules.java.hints.introduce.IntroduceFieldFix.implement(IntroduceFieldFix.java:179)
   at org.netbeans.modules.editor.hints.HintsUI$1.run(HintsUI.java:847)
   at org.openide.util.RequestProcessor$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)