java.lang.NullPointerException at com.sun.tools.javac.code.Types$DescriptorFilter.accepts(Types.java:900) at com.sun.tools.javac.code.Types$DescriptorFilter.accepts(Types.java:887) at com.sun.tools.javac.code.Scope$ScopeImpl$1$1.skipToNextMatchingEntry(Scope.java:605) at com.sun.tools.javac.code.Scope$ScopeImpl$1$1.update(Scope.java:594) at com.sun.tools.javac.code.Scope$ScopeImpl$1$1.(Scope.java:573) at com.sun.tools.javac.code.Scope$ScopeImpl$1.iterator(Scope.java:569) at com.sun.tools.javac.code.Scope$CompoundScope.lambda$null$8(Scope.java:1006) at com.sun.tools.javac.util.Iterators$CompoundIterator.hasNext(Iterators.java:57) at com.sun.tools.javac.code.Types$DescriptorCache.findDescriptorInternal(Types.java:586) at com.sun.tools.javac.code.Types$DescriptorCache.get(Types.java:565) at com.sun.tools.javac.code.Types.findDescriptorType(Types.java:742) at com.sun.tools.javac.comp.Attr.setFunctionalInfo(Attr.java:3230) at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2529) at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1777) at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:496) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:637) at com.sun.tools.javac.comp.Attr.visitTypeCast(Attr.java:3451) at com.sun.tools.javac.tree.JCTree$JCTypeCast.accept(JCTree.java:1983) at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:496) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:637) at com.sun.tools.javac.comp.Attr.attribArgs(Attr.java:740) at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1920) 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.visitReturn(Attr.java:1789) at com.sun.tools.javac.tree.JCTree$JCReturn.accept(JCTree.java:1516) at com.sun.tools.javac.comp.Attr$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.DeferredAttr.attribSpeculative(DeferredAttr.java:461) at com.sun.tools.javac.comp.Analyzer.analyze(Analyzer.java:382) at com.sun.tools.javac.comp.Analyzer.analyzeIfNeeded(Analyzer.java:360) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:713) 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$AbstractRootsWork$4.call(RepositoryUpdater.java:5729) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork$4.call(RepositoryUpdater.java:5637) 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$1500(RepositoryUpdater.java:159) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSource(RepositoryUpdater.java:5764) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSources(RepositoryUpdater.java:5434) at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$RootsWork.getDone(RepositoryUpdater.java:5053) 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)