JBoss: ver 4.0.3 SP1 (it's the same with 4.04) installing "all" packets
JVM: 1.5.0_05
IDE: Netbeans 5 beta

I need to get access to the TreeCache from a servlet. So i used a EJB that find the TreeCacheMBeans and manage it. And a Servlet that lookup and use the EJB
When i look for the MBeanServer from inside the EJB with the code:

server = MBeanServerLocator.locatejboss();

the MBeanServerLocator throws an exception:
java.lang.RuntimeException: javax.ejb.CreateException: java.lang.IllegalStateException: No 'jboss' MBeanServer found!

It doesn't work also if I use MBeanServerLocator.locate() instead of MBeanServerLocator.locatejboss().
The method .locate() throws java.util.NoSuchElementException.

The only way i found to get the MBeanServer is using this code from inside the SERVLET:

List servers=MBeanServerFactory.findMBeanServer(null);
 if(servers == null || servers.size() == 0)
 throw new Exception("TreeCacheView.init(): no MBeanServers found");
 server=(MBeanServer)servers.get(0);

But this DOESN'T work inside the EJB!! How is it?
How is it possible to find the MBeanServer from the EJB?

Thanks!