Tuesday, October 16, 2012

Calculating Coherence cluster size on a remote server using JMX



In one of the projects I had a problem regarding calculating the size of a Oracle Coherence cluster. It doesn't seem to difficult since there is already a nice piece of code that can do it for us:

Calculating Coherence cluster size

The problem is that this code is working properly only if the Coherence cluster is not remote. So how can we access it?

We have to modify the following function

public static MBeanServer getMBeanServer() {
        MBeanServer server = null;
        for (Object o : MBeanServerFactory.findMBeanServer(null)) {
            server = (MBeanServer) o;
            if (DOMAIN_DEFAULT.length() == 0 ||
                server.getDefaultDomain().equals(DOMAIN_DEFAULT)) {
                break;
            }
            server = null;
        }
        if (server == null) {
            server = MBeanServerFactory.createMBeanServer(DOMAIN_DEFAULT);
        }

        return server;
    }


To this one
public static MBeanServerConnection getMBeanServer() throws IOException {
 JMXServiceURL url = new JMXServiceURL("service://...");
 JMXConnector jmxc = JMXConnectorFactory.connect(url, null);
 return jmxc.getMBeanServerConnection();
}

And modify the line

MBeanServer server = getMBeanServer();


To use the new interface
MBeanServerConnection server = getMBeanServer();

More information on how to define the Coherence JMX service URL and JMX for Coherence as such can be found here

Managing Coherence using JMX

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