java.lang.NullPointerException
   at org.netbeans.modules.java.hints.introduce.IntroduceHint.resolveType(IntroduceHint.java:1557)
   at org.netbeans.modules.java.hints.introduce.IntroduceHint.access$1000(IntroduceHint.java:160)
   at org.netbeans.modules.java.hints.introduce.IntroduceHint$IntroduceFix$1.run(IntroduceHint.java:1627)
   at org.netbeans.modules.java.hints.introduce.IntroduceHint$IntroduceFix$1.run(IntroduceHint.java:1617)
   at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:644)
   at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:634)
   at org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:488)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:586)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:155)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:139)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:201)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:198)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:74)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:198)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:106)
   at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:438)
   at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:409)
   at org.netbeans.api.java.source.JavaSource.runModificationTask(JavaSource.java:655)
   at org.netbeans.modules.java.hints.introduce.IntroduceHint$IntroduceFix.implement(IntroduceHint.java:1617)
   at org.netbeans.modules.editor.hints.HintsUI$1.run(HintsUI.java:800)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)