java.lang.NullPointerException
   at com.sun.tools.javac.comp.Analyzer$LambdaAnalyzer.match(Analyzer.java:274)
   at com.sun.tools.javac.comp.Analyzer$LambdaAnalyzer.match(Analyzer.java:264)
   at com.sun.tools.javac.comp.Analyzer$StatementScanner.scan(Analyzer.java:440)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:57)
   at com.sun.tools.javac.tree.TreeScanner.visitApply(TreeScanner.java:203)
   at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1604)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Analyzer$StatementScanner.scan(Analyzer.java:446)
   at com.sun.tools.javac.tree.TreeScanner.visitExec(TreeScanner.java:178)
   at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1422)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Analyzer$StatementScanner.scan(Analyzer.java:446)
   at com.sun.tools.javac.comp.Analyzer.analyze(Analyzer.java:364)
   at com.sun.tools.javac.comp.Analyzer.analyzeIfNeeded(Analyzer.java:353)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:706)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:723)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1205)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:990)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:494)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:635)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:704)
   at com.sun.tools.javac.comp.Attr.visitIf(Attr.java:1677)
   at com.sun.tools.javac.tree.JCTree$JCIf.accept(JCTree.java:1391)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:494)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:635)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:704)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:723)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1205)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:990)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:494)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:635)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:704)
   at com.sun.tools.javac.comp.Attr.attribStatToTree(Attr.java:412)
   at com.sun.tools.javac.api.JavacTrees.attribStatToTree(JavacTrees.java:975)
   at com.sun.tools.javac.api.JavacTrees.getAttrContext(JavacTrees.java:935)
   at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:794)
   at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:156)
   at org.netbeans.modules.java.hints.jdk.ConvertToLambdaPreconditionChecker.getScopeFromTree(ConvertToLambdaPreconditionChecker.java:690)
   at org.netbeans.modules.java.hints.jdk.ConvertToLambdaPreconditionChecker.<init>(ConvertToLambdaPreconditionChecker.java:115)
   at org.netbeans.modules.java.hints.jdk.ConvertToLambda.computeAnnonymousToLambda(ConvertToLambda.java:102)
   at sun.reflect.GeneratedMethodAccessor174.invoke(GeneratedMethodAccessor174.java:0)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.netbeans.modules.java.hints.providers.code.CodeHintProviderImpl$WorkerImpl.createErrors(CodeHintProviderImpl.java:339)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.runHint(HintsInvoker.java:810)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.doComputeHints(HintsInvoker.java:575)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHintsImpl(HintsInvoker.java:295)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:240)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:210)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:183)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:150)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsTask.run(HintsTask.java:137)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsTask.run(HintsTask.java:88)
   at org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper.run(JavaSourceAccessor.java:298)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:584)
   at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.run(TaskProcessor.java:809)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304)
   at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.execute(TaskProcessor.java:725)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:686)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
   at java.util.concurrent.FutureTask.run(FutureTask.java:266)
   at org.openide.util.RequestProcessor$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)