Explain JMX URL

Question

I am trying to understand a JMX service URL.

service:jmx:rmi://192.168.30.10:1234/jndi/rmi://192.168.30.10:2344/jmxrmi

It would be great, i

Answer 1

To explain:

service:jmx:rmi://192.168.30.10:1234/jndi/rmi://192.168.30.10:2344/jmxrmi

1. service:jmx:rmi://192.168.30.10:1234 - says that there is a JMX Agent on the machine with IP address 192.168.30.10. The JMX agent is using (TCP) port 1234 to provide JMX service(s) over RMI (basically acts as an RMI server).
2. /jndi/rmi://192.168.30.10:2344/jmxrmi - says that the RMI stub to interact with the JMX Agent over RMI can be found in the RMI registry which is running on the machine with IP address 192.168.30.10 and is using (TCP) port 2344. To get the RMI stub you need to lookup the "jmxrmi" binding.

Previous answers suggest that the 2nd part of the URL is to obtain the server port of the JMX RMI server. That is not correct. The JMX RMI server port is (TCP) 1234 and is part of the URL. What you get from the RMI registry is the RMI stub (javax.management.remote.rmi.RMIServerImpl_Stub) which you can use to talk to JMX Agent (MBean Server) over RMI.

Hope this helps.