code: public String getAttributeValue(String attributeName)
              throws JMException, UnsupportedEncodingException {
          String decodedAttributeName = sanitizer.urlDecode(attributeName, encoding);
          return sanitizer.escapeValue(mBeanServer.getAttribute(objectName, decodedAttributeName));
      }
docs: Get the value for a single attribute on an MBean by name.
  @param attributeName the attribute name (can be URL-encoded).
  @return the value as a String.
  @throws JMException Java Management Exception
  @throws UnsupportedEncodingException if the encoding is not supported.