java.lang.NullPointerException
   at com.sun.tools.javac.code.Types.glb(Types.java:3459)
   at com.sun.tools.javac.comp.Infer$InferenceStep$3.solve(Infer.java:974)
   at com.sun.tools.javac.comp.Infer$InferenceStep$4.solve(Infer.java:996)
   at com.sun.tools.javac.comp.Infer$InferenceContext.solveBasic(Infer.java:1604)
   at com.sun.tools.javac.comp.Infer$InferenceContext.solveBasic(Infer.java:1595)
   at com.sun.tools.javac.comp.Infer$InferenceContext.solveLegacy(Infer.java:1622)
   at com.sun.tools.javac.comp.Infer.instantiateMethod(Infer.java:188)
   at com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:558)
   at com.sun.tools.javac.comp.Resolve.checkMethod(Resolve.java:586)
   at com.sun.tools.javac.comp.Attr.checkMethod(Attr.java:3806)
   at com.sun.tools.javac.comp.Attr.checkIdInternal(Attr.java:3607)
   at com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:3508)
   at com.sun.tools.javac.comp.Attr.checkMethodId(Attr.java:3486)
   at com.sun.tools.javac.comp.Attr.checkId(Attr.java:3474)
   at com.sun.tools.javac.comp.Attr.visitIdent(Attr.java:3230)
   at com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:1976)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:611)
   at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1842)
   at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1446)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:611)
   at com.sun.tools.javac.comp.Attr.visitTypeCast(Attr.java:3129)
   at com.sun.tools.javac.tree.JCTree$JCTypeCast.accept(JCTree.java:1786)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:611)
   at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:629)
   at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:1110)
   at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:834)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:611)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:656)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:672)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1148)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:890)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:611)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:656)
   at com.sun.tools.javac.comp.Attr.visitForeachLoop(Attr.java:1211)
   at com.sun.tools.javac.tree.JCTree$JCEnhancedForLoop.accept(JCTree.java:1016)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:611)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:656)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:672)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1148)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:890)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:611)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:656)
   at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1045)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitMethodDef(NBAttr.java:76)
   at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:777)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:611)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:656)
   at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4319)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4216)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4168)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4150)
   at com.sun.tools.javac.comp.Attr.visitClassDef(Attr.java:882)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitClassDef(NBAttr.java:70)
   at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:691)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:611)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:656)
   at com.sun.tools.javac.comp.Attr.visitNewClass(Attr.java:2155)
   at com.sun.tools.javac.tree.JCTree$JCNewClass.accept(JCTree.java:1497)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:611)
   at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:629)
   at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:1110)
   at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:834)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:611)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:656)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:672)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1148)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:890)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:611)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:656)
   at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1045)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitMethodDef(NBAttr.java:76)
   at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:777)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:611)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:656)
   at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4319)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4216)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4150)
   at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4124)
   at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1286)
   at com.sun.tools.javac.api.JavacTaskImpl$1.process(JavacTaskImpl.java:473)
   at com.sun.tools.javac.api.JavacTaskImpl$Filter.run(JavacTaskImpl.java:623)
   at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:476)
   at org.netbeans.modules.java.source.indexing.SuperOnePassCompileWorker.compile(SuperOnePassCompileWorker.java:232)
   at org.netbeans.modules.java.source.indexing.JavaCustomIndexer.index(JavaCustomIndexer.java:237)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor$2.run(Indexable.java:161)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runIndexer(RepositoryUpdater.java:267)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor.index(Indexable.java:159)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doIndex(RepositoryUpdater.java:2483)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.access$1200(RepositoryUpdater.java:2051)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2375)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2373)
   at org.netbeans.modules.parsing.impl.indexing.errors.TaskCache.refreshTransaction(TaskCache.java:544)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.index(RepositoryUpdater.java:2373)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSource(RepositoryUpdater.java:5046)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSources(RepositoryUpdater.java:4758)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$RootsWork.getDone(RepositoryUpdater.java:4463)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:3070)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:5488)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.access$4600(RepositoryUpdater.java:5154)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$3$1.run(RepositoryUpdater.java:5413)
   at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.performScan(RunWhenScanFinishedSupport.java:96)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$3.call(RepositoryUpdater.java:5409)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$3.call(RepositoryUpdater.java:5405)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:74)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:5405)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
   at java.util.concurrent.FutureTask.run(FutureTask.java:166)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)