public JMXItemChecker(JSONObject request) throws ZabbixException
        {
                super(request);

                try
                {
                        String conn = request.getString(JSON_TAG_CONN);
                        int port = request.getInt(JSON_TAG_PORT);

                        Integer weblogic = new Integer("7001");

                        int retvalweblogic = weblogic.compareTo(port);

                        if (retvalweblogic == 0)
                        {
                                url = new JMXServiceURL("service:jmx:iiop://" + conn + ":" + port + "/jndi/weblogic.management.mbeanservers.domainruntime");
                        } else {
                                url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://" + conn + ":" + port + "/jmxrmi");
                        }

                        jmxc = null;
                        mbsc = null;

                        username = request.optString(JSON_TAG_USERNAME, null);
                        password = request.optString(JSON_TAG_PASSWORD, null);

                        if (null != username && null == password || null == username && null != password)
                                throw new IllegalArgumentException("invalid username and password nullness combination");
                }
                catch (Exception e)
                {
                        throw new ZabbixException(e);
                }
        }