JConsole connectivity in v3 :

Three quick steps to connect through JConsole are:

1. Add following system properties to your domain's java-config in domain.xml

com.sun.management.jmxremote.port=jmx-connector-port-number-for e.g. 8686

and

com.sun.management.jmxremote.host=jmx-connector-hostname-for e.g. 129.92.42.134

2. Start Jconsole and specify the JMXServiceURL:
service:jmx:rmi:///jndi/rmi://localhost:8686/jmxrmi

3. Start browsing GFv3 MBeans along with Platform MBeans

For a more detailed explanation JConsole connectivity options and JVM Monitoring and Management,
please refer to http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html