java.lang.NullPointerException
   at com.sun.tools.javac.jvm.ClassReader.enterTypevars(ClassReader.java:2197)
   at com.sun.tools.javac.jvm.ClassReader.enterTypevars(ClassReader.java:2208)
   at com.sun.tools.javac.jvm.ClassReader.enterTypevars(ClassReader.java:2205)
   at com.sun.tools.javac.jvm.ClassReader.enterTypevars(ClassReader.java:2206)
   at com.sun.tools.javac.jvm.ClassReader.readEnclosingMethodAttr(ClassReader.java:1307)
   at com.sun.tools.javac.jvm.ClassReader$12.read(ClassReader.java:1143)
   at com.sun.tools.javac.jvm.ClassReader.readAttrs(ClassReader.java:1400)
   at com.sun.tools.javac.jvm.ClassReader.readClassAttrs(ClassReader.java:1415)
   at com.sun.tools.javac.jvm.ClassReader.readClass(ClassReader.java:2245)
   at com.sun.tools.javac.jvm.ClassReader.readClassFile(ClassReader.java:2343)
   at com.sun.tools.javac.jvm.ClassReader.fillIn(ClassReader.java:2564)
   at com.sun.tools.javac.jvm.ClassReader.complete(ClassReader.java:2484)
   at com.sun.tools.javac.jvm.ClassReader.access$000(ClassReader.java:77)
   at com.sun.tools.javac.jvm.ClassReader$1.complete(ClassReader.java:244)
   at com.sun.tools.javac.code.Symbol.complete(Symbol.java:577)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1061)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.flags(Symbol.java:988)
   at com.sun.tools.javac.code.Symbol$TypeSymbol.getEnclosedElements(Symbol.java:739)
   at org.netbeans.modules.java.hints.bugs.NPECheck$VisitorImpl.visitMethod(NPECheck.java:943)
   at org.netbeans.modules.java.hints.bugs.NPECheck$VisitorImpl.visitMethod(NPECheck.java:423)
   at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:806)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:68)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94)
   at org.netbeans.modules.java.hints.bugs.NPECheck$VisitorImpl.scan(NPECheck.java:502)
   at org.netbeans.modules.java.hints.bugs.NPECheck$VisitorImpl.scan(NPECheck.java:423)
   at com.sun.source.util.TreeScanner.scan(TreeScanner.java:91)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103)
   at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:99)
   at com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:133)
   at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:725)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:68)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94)
   at org.netbeans.modules.java.hints.bugs.NPECheck$VisitorImpl.scan(NPECheck.java:502)
   at org.netbeans.modules.java.hints.bugs.NPECheck$VisitorImpl.scan(NPECheck.java:423)
   at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:81)
   at com.sun.source.util.TreeScanner.scan(TreeScanner.java:91)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103)
   at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:99)
   at com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:133)
   at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:725)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:68)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94)
   at org.netbeans.modules.java.hints.bugs.NPECheck$VisitorImpl.scan(NPECheck.java:502)
   at org.netbeans.modules.java.hints.bugs.NPECheck$VisitorImpl.scan(NPECheck.java:423)
   at com.sun.source.util.TreeScanner.scan(TreeScanner.java:91)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103)
   at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:99)
   at com.sun.source.util.TreeScanner.visitCompilationUnit(TreeScanner.java:120)
   at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:551)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:68)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94)
   at org.netbeans.modules.java.hints.bugs.NPECheck$VisitorImpl.scan(NPECheck.java:502)
   at org.netbeans.modules.java.hints.bugs.NPECheck.computeExpressionsState(NPECheck.java:381)
   at org.netbeans.modules.java.hints.bugs.NPECheck.methodInvocation(NPECheck.java:196)
   at sun.reflect.GeneratedMethodAccessor111.invoke(GeneratedMethodAccessor111.java:0)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:606)
   at org.netbeans.modules.java.hints.providers.code.CodeHintProviderImpl$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.access$400(HintsInvoker.java:112)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.runAndAdd(HintsInvoker.java:669)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:688)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:622)
   at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:81)
   at com.sun.source.util.TreeScanner.visitVariable(TreeScanner.java:153)
   at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:870)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:68)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:694)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:622)
   at com.sun.source.util.TreeScanner.scan(TreeScanner.java:91)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103)
   at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:99)
   at com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:133)
   at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:725)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:68)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:94)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:694)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:622)
   at com.sun.source.util.TreeScanner.scan(TreeScanner.java:91)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103)
   at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:99)
   at com.sun.source.util.TreeScanner.visitCompilationUnit(TreeScanner.java:120)
   at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:551)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:50)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:713)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHintsImpl(HintsInvoker.java:257)
   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$RunnableAdapter.call(Executors.java:471)
   at java.util.concurrent.FutureTask.run(FutureTask.java:262)
   at org.openide.util.RequestProcessor$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)