java.lang.AssertionError
   at com.sun.tools.javac.util.Assert.error(Assert.java:155)
   at com.sun.tools.javac.util.Assert.check(Assert.java:46)
   at com.sun.tools.javac.jvm.ClassReader$3.read(ClassReader.java:1064)
   at com.sun.tools.javac.jvm.ClassReader.readAttrs(ClassReader.java:1554)
   at com.sun.tools.javac.jvm.ClassReader.readMemberAttrs(ClassReader.java:1544)
   at com.sun.tools.javac.jvm.ClassReader.readField(ClassReader.java:2362)
   at com.sun.tools.javac.jvm.ClassReader.readClass(ClassReader.java:2659)
   at com.sun.tools.javac.jvm.ClassReader.readClassBuffer(ClassReader.java:2726)
   at com.sun.tools.javac.jvm.ClassReader.readClassFile(ClassReader.java:2739)
   at com.sun.tools.javac.code.ClassFinder.fillIn(ClassFinder.java:367)
   at com.sun.tools.javac.code.ClassFinder.complete(ClassFinder.java:294)
   at com.sun.tools.javac.code.Symbol.complete(Symbol.java:636)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1325)
   at com.sun.tools.javac.model.JavacElements.binaryNameToClassSymbol(JavacElements.java:260)
   at com.sun.tools.javac.model.JavacElements.getTypeElementByBinaryName(JavacElements.java:238)
   at com.sun.tools.javac.model.JavacElements.getTypeElementByBinaryName(JavacElements.java:226)
   at org.netbeans.modules.java.source.ui.AsyncJavaSymbolDescriptor.resolve(AsyncJavaSymbolDescriptor.java:236)
   at org.netbeans.modules.java.source.ui.AsyncJavaSymbolDescriptor.lambda$initialize$0(AsyncJavaSymbolDescriptor.java:183)
   at org.openide.util.RequestProcessor$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)