java.lang.IllegalArgumentException: Invalid method
   at com.sun.tools.jdi.ObjectReferenceImpl.validateMethodInvocation(ObjectReferenceImpl.java:287)
   at com.sun.tools.jdi.ObjectReferenceImpl.invokeMethod(ObjectReferenceImpl.java:381)
   at com.zeroturnaround.jdi.JRObjectReference.invokeMethodFallback(JRObjectReference.java:201)
   at com.zeroturnaround.jdi.JRObjectReference.invokeMethodGriffin(JRObjectReference.java:176)
   at com.zeroturnaround.jdi.JRObjectReference.invokeMethod(JRObjectReference.java:155)
   at com.sun.tools.jdi.ObjectReferenceImpl$$$jr.invokeMethod(ObjectReferenceImpl.java:60000)
   at org.netbeans.modules.debugger.jpda.jdi.ObjectReferenceWrapper.invokeMethod(ObjectReferenceWrapper.java:510)
   at org.netbeans.modules.debugger.jpda.expr.TreeEvaluator.invokeVirtual(TreeEvaluator.java:320)
   at org.netbeans.modules.debugger.jpda.expr.TreeEvaluator.invokeVirtual(TreeEvaluator.java:275)
   at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.invokeMethod(JPDADebuggerImpl.java:1110)
   at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.invokeMethod(JPDADebuggerImpl.java:1016)
   at org.netbeans.modules.debugger.jpda.models.AbstractObjectVariable.getToStringValue(AbstractObjectVariable.java:521)
   at org.netbeans.modules.debugger.jpda.models.AbstractObjectVariable.getToStringValue(AbstractObjectVariable.java:485)
   at org.netbeans.modules.debugger.jpda.models.AbstractObjectVariable.getToStringValue(AbstractObjectVariable.java:449)
   at org.netbeans.modules.debugger.jpda.projects.ToolTipAnnotation.run(ToolTipAnnotation.java:259)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)