A DESCRIPTION OF THE PROBLEM :
The 'J' letter is missed in the 'Example 2-3' code. Should be:
JMXServiceURL u = ...
but now is:
MXServiceURL u = ...


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Example 2-3 Creating a Connection Using JMXConnectorFactory.connect
JMXServiceURL u = new JMXServiceURL(
  "service:jmx:rmi:///jndi/rmi://" + hostName + ":" + portNum + "/jmxrmi");
  JMXConnector c = JMXConnectorFactory.connect(u);

ACTUAL -
Example 2-3 Creating a Connection Using JMXConnectorFactory.connect
MXServiceURL u = new JMXServiceURL(
  "service:jmx:rmi:///jndi/rmi://" + hostName + ":" + portNum + "/jmxrmi");
  JMXConnector c = JMXConnectorFactory.connect(u);


URL OF FAULTY DOCUMENTATION :
http://docs.oracle.com/javase/7/docs/technotes/guides/management/agent.html#gdevg