java.lang.AssertionError: isSameType UNKNOWN
   at com.sun.tools.javac.code.Types$SameTypeVisitor.visitType(Types.java:1283)
   at com.sun.tools.javac.code.Types$SameTypeVisitor.visitType(Types.java:1255)
   at com.sun.tools.javac.code.Type.accept(Type.java:214)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4699)
   at com.sun.tools.javac.code.Types$SameTypeVisitor.visitClassType(Types.java:1303)
   at com.sun.tools.javac.code.Types$SameTypeVisitor.visitClassType(Types.java:1255)
   at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:999)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4699)
   at com.sun.tools.javac.code.Types$SameTypeVisitor.visitMethodType(Types.java:1344)
   at com.sun.tools.javac.code.Types$SameTypeVisitor.visitMethodType(Types.java:1255)
   at com.sun.tools.javac.code.Type$MethodType.accept(Type.java:1459)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4699)
   at com.sun.tools.javac.code.Types.isSameType(Types.java:1252)
   at com.sun.tools.javac.code.Types.isSameType(Types.java:1247)
   at com.sun.tools.javac.comp.TransTypes.visitMethodDef(TransTypes.java:538)
   at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:842)
   at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
   at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)
   at com.sun.tools.javac.tree.TreeTranslator.visitClassDef(TreeTranslator.java:139)
   at com.sun.tools.javac.comp.TransTypes.translateClass(TransTypes.java:961)
   at com.sun.tools.javac.comp.TransTypes.visitClassDef(TransTypes.java:514)
   at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:748)
   at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)
   at com.sun.tools.javac.comp.TransTypes.translate(TransTypes.java:493)
   at com.sun.tools.javac.comp.TransTypes.translateTopLevelClass(TransTypes.java:985)
   at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1532)
   at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1391)
   at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1479)
   at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1391)
   at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1479)
   at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1391)
   at com.sun.tools.javac.api.JavacTaskImpl$6.process(JavacTaskImpl.java:539)
   at com.sun.tools.javac.api.JavacTaskImpl$Filter.run(JavacTaskImpl.java:607)
   at com.sun.tools.javac.api.JavacTaskImpl.generate(JavacTaskImpl.java:542)
   at org.netbeans.modules.java.source.indexing.MultiPassCompileWorker.compile(MultiPassCompileWorker.java:303)
   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$Work$3.call(RepositoryUpdater.java:3310)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$3.call(RepositoryUpdater.java:3276)
   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$1500(RepositoryUpdater.java:159)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.scanFiles(RepositoryUpdater.java:3276)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$FileListWork.getDone(RepositoryUpdater.java:3795)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:3430)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:6193)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.access$4300(RepositoryUpdater.java:5844)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2$1.run(RepositoryUpdater.java:6109)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304)
   at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.performScan(RunWhenScanFinishedSupport.java:106)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6105)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6101)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:6101)
   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)