java.lang.NullPointerException
   at org.netbeans.modules.java.hints.introduce.InstanceRefFinder.addInstanceForConstructor(InstanceRefFinder.java:237)
   at org.netbeans.modules.java.hints.introduce.InstanceRefFinder.visitNewClass(InstanceRefFinder.java:443)
   at com.sun.tools.javac.tree.JCTree$JCNewClass.accept(JCTree.java:1532)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:68)
   at com.sun.source.util.TreeScanner.visitReturn(TreeScanner.java:255)
   at com.sun.tools.javac.tree.JCTree$JCReturn.accept(JCTree.java:1390)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:50)
   at org.netbeans.modules.java.hints.introduce.InstanceRefFinder.process(InstanceRefFinder.java:267)
   at org.netbeans.modules.java.hints.introduce.IntroduceExpressionBasedMethodFix.computeViableTargets(IntroduceExpressionBasedMethodFix.java:133)
   at org.netbeans.modules.java.hints.introduce.IntroduceMethodFix.computeIntroduceMethod(IntroduceMethodFix.java:293)
   at org.netbeans.modules.java.hints.introduce.IntroduceHint.computeError(IntroduceHint.java:400)
   at org.netbeans.modules.java.hints.introduce.IntroduceHint.run(IntroduceHint.java:235)
   at org.netbeans.modules.java.hints.introduce.IntroduceHint.run(IntroduceHint.java:135)
   at org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper.run(JavaSourceAccessor.java:298)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:568)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:744)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
   at java.util.concurrent.FutureTask.run(FutureTask.java:262)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)