org.netbeans.api.debugger.InvalidExpressionException: Identifier cannot be resolved: Test.X
        at org.netbeans.modules.debugger.jpda.evaluator.PValue.error(PValue.java:212)
        at org.netbeans.modules.debugger.jpda.evaluator.PValue.error(PValue.java:199)
        at org.netbeans.modules.debugger.jpda.evaluator.VMEngine.resolveVariableName(VMEngine.java:84)
        at org.netbeans.modules.debugger.jpda.evaluator.Node$Variable.value(Node.java:220)
        at org.netbeans.modules.debugger.jpda.evaluator.Evaluator$EvaluatingThread.run(Evaluator.java:129)