docs: public String invokeOperation(String operationName, Map<String, String[]> parameterMap)
          throws JMException, UnsupportedEncodingException {
          MBeanOperationInfo operationInfo = getOperationInfo(operationName);
          MBeanOperationInvoker invoker = createMBeanOperationInvoker(mBeanServer, objectName, operationInfo);
          return sanitizer.escapeValue(invoker.invokeOperation(parameterMap));
      }