code: public String getAttributeString(ObjectName name, String attributeName) throws Exception {
  		Object bean = getAttribute(name, attributeName);
  		if (bean == null) {
  			return null;
  		} else {
  			return ClientUtils.valueToString(bean);
  		}
  	}
docs: Return the value of a JMX attribute as a String or null if attribute has a null value.