Map<String, String[]> env = new HashMap<String, String[]>();
String[] credentials = {"monitor", "asd1asd!"};
env.put(JMXConnector.CREDENTIALS, credentials);

JMXServiceURL url = new JMXServiceURL("service:jmx:remoting-jmx://localhost:9999");
JMXConnector jmxConnector = JMXConnectorFactory.connect(url, env);
MBeanServerConnection mBeanServerConnection = jmxConnector.getMBeanServerConnection();

ObjectName mgmtRealm = new ObjectName("jboss.as:core-service=management,security-realm=ManagementRealm");
MBeanInfo info = mBeanServerConnection.getMBeanInfo(mgmtRealm);
System.out.println(info.getClassName());

>>> org.jboss.as.controller.ModelController