[jboss-jira] [JBoss JIRA] Created: (JBCACHE-1392) Use the correct MBeanServer if multiple MBeanServers are present.

[Robert Buck (JIRA)]

Use the correct MBeanServer if multiple MBeanServers are present.
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                 Key: JBCACHE-1392
                 URL: https://jira.jboss.org/jira/browse/JBCACHE-1392
             Project: JBoss Cache
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: JMX
            Reporter: Robert Buck
            Assignee: Manik Surtani


The prior bug did not fix the issue of running the cache under jboss when the following options are present:

set JAVA_OPTS=%JAVA_OPTS% -Dcom.sun.management.jmxremote

The code is presently as follows (which is incorrect, by the way):

{code}
157 List servers=MBeanServerFactory.findMBeanServer(null);
158 if(servers == null || servers.size() == 0)
159 throw new Exception("TreeCacheView.init(): no MBeanServers found");
{code}

TreeCacheView fails to deploy because it is using the wrong MBeanServer. Rather than doing the above, you should either do something like:

{code}
   import org.jboss.mx.util.MBeanServerLocator;
   ...
   // find the local MBeanServer
   MBeanServer server = MBeanServerLocator.locateJBoss();
{code}

, or you should do something like this:

{code}
    public static MBeanServer getDefaultMBeanServer() {
        return findMBeanServer("jboss");
    }

    private static MBeanServer findMBeanServer(String agentId) {
        List servers = MBeanServerFactory.findMBeanServer(null);
        if (servers != null && servers.size() > 0) {
            for (Object object : servers) {
                MBeanServer server = (MBeanServer) object;
                if (server.getDefaultDomain().equals(agentId)) {
                    return server;
                }
            }
        }
        return null;
    }
{code}

The reason is because with Java 5, when the "-Dcom.sun.management.jmxremote" switch is turned on, the default platform MBeanServer is the zeroth instance rather than "jboss".

See:

http://fisheye.jboss.com/browse/JBossCache/core/support-branches/1.4.1.SP8_JBCACHE-1247/src/org/jboss/cache/TreeCacheView.java?r=4384

To test, deploy the tree cache view, and start JBoss with the JAVA_OPTS mentioned above. 

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