java.lang.NullPointerException
   at com.sun.tools.javac.comp.TypeEnter$AbstractHeaderPhase$Synthesizer.visit(TypeEnter.java:566)
   at com.sun.tools.javac.comp.TypeEnter$AbstractHeaderPhase$1.getModelType(TypeEnter.java:546)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.getSuperclass(Symbol.java:1300)
   at com.sun.tools.javac.code.Types$15.visitClassType(Types.java:2404)
   at com.sun.tools.javac.code.Types$15.visitClassType(Types.java:2393)
   at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:1003)
   at com.sun.tools.javac.code.Types$UnaryVisitor.visit(Types.java:4872)
   at com.sun.tools.javac.code.Types.supertype(Types.java:2390)
   at com.sun.tools.javac.code.Scope$FilterImportScope$SymbolImporter.importFrom(Scope.java:964)
   at com.sun.tools.javac.code.Scope$FilterImportScope.getSymbolsByName(Scope.java:932)
   at com.sun.tools.javac.code.Scope$CompoundScope.lambda$null$7(Scope.java:1046)
   at com.sun.tools.javac.code.Scope$CompoundScope$$Lambda$182/762503088.apply(Scope.java:0)
   at com.sun.tools.javac.util.Iterators$CompoundIterator.update(Iterators.java:77)
   at com.sun.tools.javac.util.Iterators$CompoundIterator.hasNext(Iterators.java:59)
   at com.sun.tools.javac.comp.Resolve.findGlobalType(Resolve.java:2103)
   at com.sun.tools.javac.comp.Resolve.findType(Resolve.java:2183)
   at com.sun.tools.javac.comp.Resolve.findIdent(Resolve.java:2208)
   at com.sun.tools.javac.comp.Resolve.resolveIdent(Resolve.java:2435)
   at com.sun.tools.javac.comp.Attr.visitIdent(Attr.java:3534)
   at com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:2215)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:504)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:645)
   at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3621)
   at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:2096)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:504)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:645)
   at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3621)
   at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:2096)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:504)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:645)
   at com.sun.tools.javac.comp.Attr.attribType(Attr.java:704)
   at com.sun.tools.javac.comp.Attr.attribType(Attr.java:697)
   at com.sun.tools.javac.comp.Attr.attribBase(Attr.java:866)
   at com.sun.tools.javac.comp.TypeEnter$AbstractHeaderPhase.attribSuperTypes(TypeEnter.java:685)
   at com.sun.tools.javac.comp.TypeEnter$HierarchyPhase.runPhase(TypeEnter.java:740)
   at com.sun.tools.javac.comp.TypeEnter$Phase.doCompleteEnvs(TypeEnter.java:286)
   at com.sun.tools.javac.comp.TypeEnter$HierarchyPhase.complete(TypeEnter.java:814)
   at com.sun.tools.javac.code.Symbol.complete(Symbol.java:630)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1262)
   at com.sun.tools.javac.comp.TypeEnter$HierarchyPhase.doCompleteEnvs(TypeEnter.java:728)
   at com.sun.tools.javac.comp.TypeEnter$Phase.completeEnvs(TypeEnter.java:261)
   at com.sun.tools.javac.comp.TypeEnter$Phase.completeEnvs(TypeEnter.java:270)
   at com.sun.tools.javac.comp.TypeEnter.complete(TypeEnter.java:211)
   at com.sun.tools.javac.code.Symbol.complete(Symbol.java:630)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1262)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.flags(Symbol.java:1187)
   at com.sun.tools.javac.comp.Resolve.isAccessible(Resolve.java:313)
   at com.sun.tools.javac.comp.Resolve.isAccessible(Resolve.java:299)
   at com.sun.tools.javac.comp.Resolve.loadClass(Resolve.java:1990)
   at com.sun.tools.javac.comp.Resolve.findGlobalType(Resolve.java:2104)
   at com.sun.tools.javac.comp.Resolve.findType(Resolve.java:2179)
   at com.sun.tools.javac.comp.Resolve.findIdent(Resolve.java:2208)
   at com.sun.tools.javac.comp.Resolve.resolveIdent(Resolve.java:2435)
   at com.sun.tools.javac.comp.Attr.visitIdent(Attr.java:3534)
   at com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:2215)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:504)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:645)
   at com.sun.tools.javac.comp.Attr.attribType(Attr.java:704)
   at com.sun.tools.javac.comp.Attr.attribType(Attr.java:697)
   at com.sun.tools.javac.comp.MemberEnter.visitVarDef(MemberEnter.java:412)
   at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:942)
   at com.sun.tools.javac.comp.MemberEnter.memberEnter(MemberEnter.java:171)
   at com.sun.tools.javac.comp.MemberEnter.memberEnter(MemberEnter.java:183)
   at com.sun.tools.javac.comp.TypeEnter$MembersPhase.finishClass(TypeEnter.java:979)
   at com.sun.tools.javac.comp.TypeEnter$MembersPhase.runPhase(TypeEnter.java:960)
   at com.sun.tools.javac.comp.TypeEnter$Phase.doCompleteEnvs(TypeEnter.java:286)
   at com.sun.tools.javac.comp.TypeEnter$MembersPhase.doCompleteEnvs(TypeEnter.java:895)
   at com.sun.tools.javac.comp.TypeEnter$Phase.completeEnvs(TypeEnter.java:261)
   at com.sun.tools.javac.comp.TypeEnter$Phase.completeEnvs(TypeEnter.java:270)
   at com.sun.tools.javac.comp.TypeEnter$Phase.completeEnvs(TypeEnter.java:270)
   at com.sun.tools.javac.comp.TypeEnter$Phase.completeEnvs(TypeEnter.java:270)
   at com.sun.tools.javac.comp.TypeEnter.complete(TypeEnter.java:211)
   at com.sun.tools.javac.code.Symbol.complete(Symbol.java:630)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1262)
   at com.sun.tools.javac.comp.Enter.complete(Enter.java:786)
   at com.sun.tools.javac.comp.Enter.main(Enter.java:763)
   at com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:1118)
   at com.sun.tools.javac.api.JavacTaskImpl.enter(JavacTaskImpl.java:384)
   at com.sun.tools.javac.api.JavacTaskImpl.enterTrees(JavacTaskImpl.java:436)
   at org.netbeans.modules.java.source.indexing.MultiPassCompileWorker.compile(MultiPassCompileWorker.java:219)
   at org.netbeans.modules.java.source.indexing.JavaCustomIndexer.index(JavaCustomIndexer.java:280)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$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$4.call(RepositoryUpdater.java:5726)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork$4.call(RepositoryUpdater.java:5634)
   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:5761)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSources(RepositoryUpdater.java:5431)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$RootsWork.getDone(RepositoryUpdater.java:5050)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:3432)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:6195)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.access$4300(RepositoryUpdater.java:5846)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2$1.run(RepositoryUpdater.java:6111)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304)
   at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.performScan(RunWhenScanFinishedSupport.java:106)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6107)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6103)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:90)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:6103)
   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)