java.lang.NullPointerException at com.sun.tools.javac.code.Types$DescriptorFilter.accepts(Types.java:723) at com.sun.tools.javac.code.Types$DescriptorFilter.accepts(Types.java:713) at com.sun.tools.javac.code.Scope$2$1.skipToNextMatchingEntry(Scope.java:410) at com.sun.tools.javac.code.Scope$2$1.update(Scope.java:401) at com.sun.tools.javac.code.Scope$2$1.(Scope.java:380) at com.sun.tools.javac.code.Scope$2.iterator(Scope.java:376) at com.sun.tools.javac.code.Scope$CompoundScope$1$1.nextIterator(Scope.java:661) at com.sun.tools.javac.code.Scope$CompoundScope$CompoundScopeIterator.update(Scope.java:711) at com.sun.tools.javac.code.Scope$CompoundScope$CompoundScopeIterator.(Scope.java:688) at com.sun.tools.javac.code.Scope$CompoundScope$1$1.(Scope.java:659) at com.sun.tools.javac.code.Scope$CompoundScope$1.iterator(Scope.java:659) at com.sun.tools.javac.code.Types$DescriptorCache.findDescriptorInternal(Types.java:412) at com.sun.tools.javac.code.Types$DescriptorCache.get(Types.java:391) at com.sun.tools.javac.code.Types.findDescriptorSymbol(Types.java:560) at com.sun.tools.javac.code.Types.isFunctionalInterface(Types.java:576) at com.sun.tools.javac.comp.Resolve$MostSpecificCheck$MostSpecificCheckContext.unrelatedFunctionalInterfaces(Resolve.java:1103) at com.sun.tools.javac.comp.Resolve$MostSpecificCheck$MostSpecificCheckContext.compatible(Resolve.java:1088) at com.sun.tools.javac.comp.Check.checkType(Check.java:557) at com.sun.tools.javac.comp.Attr$ResultInfo.check(Attr.java:519) at com.sun.tools.javac.comp.Resolve$MostSpecificCheck.argumentsAcceptable(Resolve.java:1057) at com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:580) at com.sun.tools.javac.comp.Resolve.instantiate(Resolve.java:625) at com.sun.tools.javac.comp.Resolve.signatureMoreSpecific(Resolve.java:1554) at com.sun.tools.javac.comp.Resolve.mostSpecific(Resolve.java:1484) at com.sun.tools.javac.comp.Resolve.selectBest(Resolve.java:1457) at com.sun.tools.javac.comp.Resolve.findMethodInScope(Resolve.java:1622) at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1693) at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1666) at com.sun.tools.javac.comp.Resolve$9.doLookup(Resolve.java:2426) at com.sun.tools.javac.comp.Resolve$BasicLookupHelper.lookup(Resolve.java:3085) at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3336) at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2423) at com.sun.tools.javac.comp.Resolve.resolveQualifiedMethod(Resolve.java:2417) at com.sun.tools.javac.comp.Attr.selectSym(Attr.java:3606) at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3492) at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1903) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613) at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1881) at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1471) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613) at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:662) at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1646) at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1302) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:682) at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:698) at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1167) at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82) at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:915) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:682) at com.sun.tools.javac.comp.Attr.visitWhileLoop(Attr.java:1183) at com.sun.tools.javac.tree.JCTree$JCWhileLoop.accept(JCTree.java:971) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:682) at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:698) at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1167) at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82) at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:915) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:682) at com.sun.tools.javac.comp.Attr.visitIf(Attr.java:1635) at com.sun.tools.javac.tree.JCTree$JCIf.accept(JCTree.java:1275) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:682) at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:698) at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1167) at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82) at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:915) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:682) at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1055) at org.netbeans.lib.nbjavac.services.NBAttr.visitMethodDef(NBAttr.java:76) at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:784) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:613) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:682) at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4572) at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4474) at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4402) at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4377) at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1311) 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.MultiPassCompileWorker.compile(MultiPassCompileWorker.java:272) at org.netbeans.modules.java.source.indexing.JavaCustomIndexer.index(JavaCustomIndexer.java:250) at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor$2.run(Indexable.java:161) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runIndexer(RepositoryUpdater.java:283) at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor.index(Indexable.java:159) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doIndex(RepositoryUpdater.java:2650) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.access$1600(RepositoryUpdater.java:2091) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2539) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2537) at org.netbeans.modules.parsing.impl.indexing.errors.TaskCache.refreshTransaction(TaskCache.java:544) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.index(RepositoryUpdater.java:2537) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.scanFiles(RepositoryUpdater.java:3148) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$FileListWork.getDone(RepositoryUpdater.java:3614) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:3267) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:5810) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.access$5300(RepositoryUpdater.java:5476) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$3$1.run(RepositoryUpdater.java:5735) at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.performScan(RunWhenScanFinishedSupport.java:96) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$3.call(RepositoryUpdater.java:5731) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$3.call(RepositoryUpdater.java:5727) at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176) at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360) at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:74) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:5727) 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:1423) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)