java.util.ConcurrentModificationException: Current owner: [java.io.WinNTFileSystem.list(Native Method), java.io.File.list(File.java:1122), java.io.File.listFiles(File.java:1207), org.netbeans.modules.java.source.parsing.FolderArchive.getFiles(FolderArchive.java:144), org.netbeans.modules.java.source.parsing.CachingFileManager.list(CachingFileManager.java:130), org.netbeans.modules.java.source.parsing.ProxyFileManager.list(ProxyFileManager.java:189), com.sun.tools.javac.jvm.ClassReader.fillIn(ClassReader.java:2872), com.sun.tools.javac.jvm.ClassReader.complete(ClassReader.java:2492), com.sun.tools.javac.jvm.ClassReader.access$000(ClassReader.java:77), com.sun.tools.javac.jvm.ClassReader$1.complete(ClassReader.java:244), com.sun.tools.javac.code.Symbol.complete(Symbol.java:577), com.sun.tools.javac.jvm.ClassReader.completeOwners(ClassReader.java:2504), com.sun.tools.javac.jvm.ClassReader.complete(ClassReader.java:2475), com.sun.tools.javac.jvm.ClassReader.access$000(ClassReader.java:77), com.sun.tools.javac.jvm
   at org.netbeans.modules.java.source.parsing.ProxyFileManager.checkSingleOwnerThread(ProxyFileManager.java:540)
   at org.netbeans.modules.java.source.parsing.ProxyFileManager.list(ProxyFileManager.java:184)
   at com.sun.tools.javac.jvm.ClassReader.fillIn(ClassReader.java:2819)
   at com.sun.tools.javac.jvm.ClassReader.complete(ClassReader.java:2492)
   at com.sun.tools.javac.jvm.ClassReader.access$000(ClassReader.java:77)
   at com.sun.tools.javac.jvm.ClassReader$1.complete(ClassReader.java:244)
   at com.sun.tools.javac.code.Symbol.complete(Symbol.java:577)
   at com.sun.tools.javac.jvm.ClassReader.completeOwners(ClassReader.java:2504)
   at com.sun.tools.javac.jvm.ClassReader.complete(ClassReader.java:2475)
   at com.sun.tools.javac.jvm.ClassReader.access$000(ClassReader.java:77)
   at com.sun.tools.javac.jvm.ClassReader$1.complete(ClassReader.java:244)
   at com.sun.tools.javac.code.Symbol.complete(Symbol.java:577)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1061)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.getSuperclass(Symbol.java:1088)
   at com.sun.tools.javac.code.Types$18.visitClassType(Types.java:2326)
   at com.sun.tools.javac.code.Types$18.visitClassType(Types.java:2315)
   at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:778)
   at com.sun.tools.javac.code.Types$UnaryVisitor.visit(Types.java:4579)
   at com.sun.tools.javac.code.Types.supertype(Types.java:2312)
   at com.sun.tools.javac.code.Types$13.visitClassType(Types.java:1968)
   at com.sun.tools.javac.code.Types$13.visitClassType(Types.java:1957)
   at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:778)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4498)
   at com.sun.tools.javac.code.Types.asSuper(Types.java:1954)
   at com.sun.tools.javac.code.Types$13.visitClassType(Types.java:1970)
   at com.sun.tools.javac.code.Types$13.visitClassType(Types.java:1957)
   at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:778)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4498)
   at com.sun.tools.javac.code.Types.asSuper(Types.java:1954)
   at com.sun.tools.javac.code.Types$13.visitClassType(Types.java:1970)
   at com.sun.tools.javac.code.Types$13.visitClassType(Types.java:1957)
   at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:778)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4498)
   at com.sun.tools.javac.code.Types.asSuper(Types.java:1954)
   at com.sun.tools.javac.code.Types$13.visitClassType(Types.java:1970)
   at com.sun.tools.javac.code.Types$13.visitClassType(Types.java:1957)
   at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:778)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4498)
   at com.sun.tools.javac.code.Types.asSuper(Types.java:1954)
   at com.sun.tools.javac.code.Types$13.visitClassType(Types.java:1970)
   at com.sun.tools.javac.code.Types$13.visitClassType(Types.java:1957)
   at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:778)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4498)
   at com.sun.tools.javac.code.Types.asSuper(Types.java:1954)
   at com.sun.tools.javac.code.Types$4.visitClassType(Types.java:922)
   at com.sun.tools.javac.code.Types$4.visitClassType(Types.java:844)
   at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:778)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4498)
   at com.sun.tools.javac.code.Types.isSubtype(Types.java:840)
   at com.sun.tools.javac.code.Types.isSubtype(Types.java:804)
   at com.sun.tools.javac.code.Types$8.visitClassType(Types.java:1552)
   at com.sun.tools.javac.code.Types$8.visitClassType(Types.java:1504)
   at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:778)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4498)
   at com.sun.tools.javac.code.Types.isCastable(Types.java:1495)
   at com.sun.tools.javac.comp.Check.checkCastable(Check.java:579)
   at com.sun.tools.javac.comp.Check.checkCastable(Check.java:576)
   at com.sun.tools.javac.comp.Attr.visitTypeCast(Attr.java:3299)
   at com.sun.tools.javac.tree.JCTree$JCTypeCast.accept(JCTree.java:1820)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:572)
   at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:614)
   at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:1081)
   at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:858)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:572)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:641)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:657)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1130)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:915)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:572)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:641)
   at com.sun.tools.javac.comp.Attr.visitIf(Attr.java:1598)
   at com.sun.tools.javac.tree.JCTree$JCIf.accept(JCTree.java:1275)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:572)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:641)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:657)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1130)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:915)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:572)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:641)
   at com.sun.tools.javac.comp.Attr.visitIf(Attr.java:1598)
   at com.sun.tools.javac.tree.JCTree$JCIf.accept(JCTree.java:1275)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:572)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:641)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:657)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1130)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:915)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:572)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:641)
   at com.sun.tools.javac.comp.Attr.attribStatToTree(Attr.java:437)
   at com.sun.tools.javac.api.JavacTrees.attribStatToTree(JavacTrees.java:887)
   at com.sun.tools.javac.api.JavacTrees.getAttrContext(JavacTrees.java:849)
   at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:728)
   at com.sun.tools.javac.api.JavacTrees.getScope(JavacTrees.java:124)
   at org.netbeans.api.java.source.TreeUtilities.scopeFor(TreeUtilities.java:656)
   at org.netbeans.modules.debugger.jpda.projects.PreferredCCParser$ParseExpressionTask.run(PreferredCCParser.java:503)
   at org.netbeans.modules.debugger.jpda.projects.PreferredCCParser.parseExpression(PreferredCCParser.java:446)
   at org.netbeans.modules.debugger.jpda.projects.EditorContextSupport.parseExpression(EditorContextSupport.java:1453)
   at org.netbeans.modules.debugger.jpda.projectsui.EditorContextImpl.parseExpression(EditorContextImpl.java:831)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:0)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:483)
   at org.netbeans.modules.debugger.jpda.EditorContextBridge.parseExpression(EditorContextBridge.java:130)
   at org.netbeans.modules.debugger.jpda.expr.TreeEvaluator.evaluate(TreeEvaluator.java:187)
   at org.netbeans.modules.debugger.jpda.JavaEvaluator.evaluateIn(JavaEvaluator.java:147)
   at org.netbeans.modules.debugger.jpda.JavaEvaluator.evaluate(JavaEvaluator.java:92)
   at org.netbeans.modules.debugger.jpda.expr.EvaluatorExpression$AssociatedExpression.evaluate(EvaluatorExpression.java:90)
   at org.netbeans.modules.debugger.jpda.expr.EvaluatorExpression.evaluate(EvaluatorExpression.java:73)
   at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.evaluateGeneric(JPDADebuggerImpl.java:955)
   at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.evaluate(JPDADebuggerImpl.java:372)
   at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.evaluate(JPDADebuggerImpl.java:336)
   at org.netbeans.modules.debugger.jpda.projectsui.ToolTipAnnotation.run(ToolTipAnnotation.java:250)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1425)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2038)