java.lang.AssertionError
   at com.sun.tools.javac.code.Symbol.clone(Symbol.java:258)
   at com.sun.tools.javac.jvm.Gen.binaryQualifier(Gen.java:313)
   at com.sun.tools.javac.jvm.Gen.visitSelect(Gen.java:2426)
   at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1903)
   at com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:950)
   at com.sun.tools.javac.jvm.Gen.visitApply(Gen.java:1902)
   at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1471)
   at com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:950)
   at com.sun.tools.javac.jvm.Gen.visitExec(Gen.java:1844)
   at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1302)
   at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:740)
   at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:775)
   at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:761)
   at com.sun.tools.javac.jvm.Gen.genStats(Gen.java:812)
   at com.sun.tools.javac.jvm.Gen.visitBlock(Gen.java:1161)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:915)
   at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:740)
   at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:775)
   at com.sun.tools.javac.jvm.Gen.genMethod(Gen.java:1034)
   at com.sun.tools.javac.jvm.Gen.visitMethodDef(Gen.java:997)
   at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:784)
   at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:740)
   at com.sun.tools.javac.jvm.Gen.genClass(Gen.java:2528)
   at com.sun.tools.javac.main.JavaCompiler.genCode(JavaCompiler.java:765)
   at com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1651)
   at com.sun.tools.javac.api.JavacTaskImpl$2.process(JavacTaskImpl.java:535)
   at com.sun.tools.javac.api.JavacTaskImpl$Filter.run(JavacTaskImpl.java:623)
   at com.sun.tools.javac.api.JavacTaskImpl.generate(JavacTaskImpl.java:538)
   at org.netbeans.modules.java.source.indexing.SuperOnePassCompileWorker$2.run(SuperOnePassCompileWorker.java:281)
   at org.netbeans.modules.java.source.parsing.FileManagerTransaction.runConcurrent(FileManagerTransaction.java:205)
   at org.netbeans.modules.java.source.indexing.SuperOnePassCompileWorker.compile(SuperOnePassCompileWorker.java:277)
   at org.netbeans.modules.java.source.indexing.JavaCustomIndexer.index(JavaCustomIndexer.java:249)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor$2.run(Indexable.java:161)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runIndexer(RepositoryUpdater.java:299)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor.index(Indexable.java:159)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doIndex(RepositoryUpdater.java:2728)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.access$400(RepositoryUpdater.java:2146)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2617)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2615)
   at org.netbeans.modules.parsing.impl.indexing.errors.TaskCache.refreshTransaction(TaskCache.java:544)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.index(RepositoryUpdater.java:2615)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork$4.call(RepositoryUpdater.java:5629)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork$4.call(RepositoryUpdater.java:5540)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$3.run(RepositoryUpdater.java:2119)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:295)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runInContext(RepositoryUpdater.java:2115)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runInContext(RepositoryUpdater.java:2096)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.access$1100(RepositoryUpdater.java:155)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSource(RepositoryUpdater.java:5664)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSources(RepositoryUpdater.java:5340)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$RootsWork.getDone(RepositoryUpdater.java:4965)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:3381)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:6102)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.access$4300(RepositoryUpdater.java:5749)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$3$1.run(RepositoryUpdater.java:6020)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:295)
   at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.performScan(RunWhenScanFinishedSupport.java:106)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$3.call(RepositoryUpdater.java:6016)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$3.call(RepositoryUpdater.java:6012)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:87)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:6012)
   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:1425)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:59)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:294)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2038)