java.lang.NullPointerException
   at com.sun.tools.javac.code.Types.glb(Types.java:3492)
   at com.sun.tools.javac.comp.Infer$InferenceStep$3.solve(Infer.java:965)
   at com.sun.tools.javac.comp.Infer$InferenceStep$4.solve(Infer.java:987)
   at com.sun.tools.javac.comp.Infer$InferenceContext.solveBasic(Infer.java:1598)
   at com.sun.tools.javac.comp.Infer$InferenceContext.solveBasic(Infer.java:1589)
   at com.sun.tools.javac.comp.Infer$InferenceContext.solveLegacy(Infer.java:1616)
   at com.sun.tools.javac.comp.Infer.instantiateMethod(Infer.java:189)
   at com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:559)
   at com.sun.tools.javac.comp.Resolve.checkMethod(Resolve.java:588)
   at com.sun.tools.javac.comp.Attr.checkMethod(Attr.java:3658)
   at com.sun.tools.javac.comp.Attr.checkIdInternal(Attr.java:3459)
   at com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:3360)
   at com.sun.tools.javac.comp.Attr.checkMethodId(Attr.java:3338)
   at com.sun.tools.javac.comp.Attr.checkId(Attr.java:3326)
   at com.sun.tools.javac.comp.Attr.visitIdent(Attr.java:3082)
   at com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:1976)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:605)
   at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1830)
   at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1447)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:605)
   at com.sun.tools.javac.comp.Attr.visitTypeCast(Attr.java:2981)
   at com.sun.tools.javac.tree.JCTree$JCTypeCast.accept(JCTree.java:1787)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:605)
   at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:623)
   at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:1104)
   at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:835)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:605)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:650)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:666)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1142)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:891)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:605)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:650)
   at com.sun.tools.javac.comp.Attr.visitForeachLoop(Attr.java:1205)
   at com.sun.tools.javac.tree.JCTree$JCEnhancedForLoop.accept(JCTree.java:1017)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:605)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:650)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:666)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1142)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:891)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:605)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:650)
   at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1039)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitMethodDef(NBAttr.java:76)
   at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:778)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:605)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:650)
   at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4164)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4062)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:3995)
   at com.sun.tools.javac.comp.Attr.attrib(Attr.java:3969)
   at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1317)
   at com.sun.tools.javac.api.JavacTaskImpl$1.process(JavacTaskImpl.java:468)
   at com.sun.tools.javac.api.JavacTaskImpl$Filter.run(JavacTaskImpl.java:618)
   at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:471)
   at org.netbeans.modules.java.source.indexing.MultiPassCompileWorker.compile(MultiPassCompileWorker.java:261)
   at org.netbeans.modules.java.source.indexing.JavaCustomIndexer.index(JavaCustomIndexer.java:236)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor$2.run(Indexable.java:161)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runIndexer(RepositoryUpdater.java:266)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor.index(Indexable.java:159)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doIndex(RepositoryUpdater.java:2472)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.access$1200(RepositoryUpdater.java:2040)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2364)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2362)
   at org.netbeans.modules.parsing.impl.indexing.errors.TaskCache.refreshTransaction(TaskCache.java:544)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.index(RepositoryUpdater.java:2362)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSource(RepositoryUpdater.java:5034)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSources(RepositoryUpdater.java:4746)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$RootsWork.getDone(RepositoryUpdater.java:4451)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:3059)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:5476)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.access$4600(RepositoryUpdater.java:5142)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$3$1.run(RepositoryUpdater.java:5401)
   at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.performScan(RunWhenScanFinishedSupport.java:96)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$3.call(RepositoryUpdater.java:5397)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$3.call(RepositoryUpdater.java:5393)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:74)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:5393)
   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:2044)