java.lang.NullPointerException
   at com.sun.tools.javac.comp.Check.clearLocalClassNameIndexes(Check.java:448)
   at com.sun.tools.javac.comp.DeferredAttr$UnenterScanner.visitClassDef(DeferredAttr.java:483)
   at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:748)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.tree.TreeScanner.visitNewClass(TreeScanner.java:211)
   at com.sun.tools.javac.tree.JCTree$JCNewClass.accept(JCTree.java:1659)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.tree.TreeScanner.visitSelect(TreeScanner.java:267)
   at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:2075)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.tree.TreeScanner.visitApply(TreeScanner.java:202)
   at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1604)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.tree.TreeScanner.visitVarDef(TreeScanner.java:101)
   at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:926)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:57)
   at com.sun.tools.javac.tree.TreeScanner.visitBlock(TreeScanner.java:108)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:990)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.tree.TreeScanner.visitLambda(TreeScanner.java:224)
   at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1777)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   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$JCMethodInvocation.accept(JCTree.java:1604)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.tree.TreeScanner.visitSelect(TreeScanner.java:267)
   at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:2075)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.tree.TreeScanner.visitApply(TreeScanner.java:202)
   at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1604)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.tree.TreeScanner.visitVarDef(TreeScanner.java:101)
   at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:926)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:57)
   at com.sun.tools.javac.tree.TreeScanner.visitBlock(TreeScanner.java:108)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:990)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.tree.TreeScanner.visitLambda(TreeScanner.java:224)
   at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1777)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.DeferredAttr.attribSpeculative(DeferredAttr.java:466)
   at com.sun.tools.javac.comp.DeferredAttr.attribSpeculative(DeferredAttr.java:448)
   at com.sun.tools.javac.comp.DeferredAttr$4.complete(DeferredAttr.java:336)
   at com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:302)
   at com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:289)
   at com.sun.tools.javac.comp.DeferredAttr$RecoveryDeferredTypeMap.recover(DeferredAttr.java:974)
   at com.sun.tools.javac.comp.DeferredAttr$RecoveryDeferredTypeMap.typeOf(DeferredAttr.java:945)
   at com.sun.tools.javac.comp.DeferredAttr$DeferredTypeMap.visitType(DeferredAttr.java:910)
   at com.sun.tools.javac.comp.DeferredAttr$RecoveryDeferredTypeMap.visitType(DeferredAttr.java:933)
   at com.sun.tools.javac.comp.DeferredAttr$DeferredTypeMap.visitType(DeferredAttr.java:896)
   at com.sun.tools.javac.code.Type.accept(Type.java:214)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4699)
   at com.sun.tools.javac.code.Type$TypeMapping.lambda$visit$12(Type.java:235)
   at com.sun.tools.javac.util.List.map(List.java:425)
   at com.sun.tools.javac.code.Type$TypeMapping.visit(Type.java:235)
   at com.sun.tools.javac.code.Type$TypeMapping.visitMethodType(Type.java:287)
   at com.sun.tools.javac.comp.DeferredAttr$RecoveryDeferredTypeMap.visitMethodType(DeferredAttr.java:963)
   at com.sun.tools.javac.comp.DeferredAttr$RecoveryDeferredTypeMap.visitMethodType(DeferredAttr.java:933)
   at com.sun.tools.javac.code.Type$MethodType.accept(Type.java:1459)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4699)
   at com.sun.tools.javac.code.Type$TypeMapping.visitForAll(Type.java:308)
   at com.sun.tools.javac.code.Type$TypeMapping.visitForAll(Type.java:227)
   at com.sun.tools.javac.code.Type$ForAll.accept(Type.java:1771)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4699)
   at com.sun.tools.javac.code.Type.map(Type.java:321)
   at com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:3861)
   at com.sun.tools.javac.comp.Attr.checkMethodId(Attr.java:3841)
   at com.sun.tools.javac.comp.Attr.checkId(Attr.java:3828)
   at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3713)
   at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:2075)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:496)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:637)
   at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1937)
   at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1604)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:496)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:637)
   at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:683)
   at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1696)
   at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1422)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:496)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:637)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:707)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:731)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1213)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:990)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:496)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:637)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:707)
   at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1099)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitMethodDef(NBAttr.java:76)
   at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:842)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:496)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:637)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:707)
   at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4688)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4587)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4515)
   at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4490)
   at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1295)
   at com.sun.tools.javac.api.JavacTaskImpl$4.process(JavacTaskImpl.java:475)
   at com.sun.tools.javac.api.JavacTaskImpl$Filter.run(JavacTaskImpl.java:607)
   at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:478)
   at org.netbeans.modules.java.source.indexing.MultiPassCompileWorker.compile(MultiPassCompileWorker.java:267)
   at org.netbeans.modules.java.source.indexing.JavaCustomIndexer.index(JavaCustomIndexer.java:261)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor$2.run(Indexable.java:161)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runIndexer(RepositoryUpdater.java:298)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor.index(Indexable.java:159)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doIndex(RepositoryUpdater.java:2773)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.access$800(RepositoryUpdater.java:2177)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2659)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2657)
   at org.netbeans.modules.parsing.impl.indexing.errors.TaskCache.refreshTransaction(TaskCache.java:565)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.index(RepositoryUpdater.java:2657)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$3.call(RepositoryUpdater.java:3315)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$3.call(RepositoryUpdater.java:3281)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$4.run(RepositoryUpdater.java:2150)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runInContext(RepositoryUpdater.java:2146)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runInContext(RepositoryUpdater.java:2127)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.access$1500(RepositoryUpdater.java:159)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.scanFiles(RepositoryUpdater.java:3281)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$FileListWork.getDone(RepositoryUpdater.java:3800)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:3435)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:6198)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.access$4300(RepositoryUpdater.java:5849)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2$1.run(RepositoryUpdater.java:6114)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304)
   at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.performScan(RunWhenScanFinishedSupport.java:106)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6110)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6106)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:6106)
   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)