[jboss-user] [EJB/JBoss] - Re: cannot connect db by EJB, pls Help!

[poonwingyee]

Thx.

But i view your reference link. 
the post said "JBoss provides a way to find these duplicate deployments. 

Go to the JMX console for JMImplementation:service=LoaderRepository?,name=Default 

http://localhost:8080/jmx-console/HtmlAdaptor?action=inspectMBean&name=JMImplementation%3Aservice%3DLoaderRepository%2Cname%3DDefault 

Invoke displayClassInfo with the name of the class
...
If you see multiple "Instance1" and multiple CodeSources? then this could be the cause of the ClassCastExceptions that you are seeing.
"

i cannot see some duplicate deployment. but i see the instance1 it show the following value:
Instance1,  org.jboss.mx.loading.LoaderRepository, R ,org.jboss.mx.loading.UnifiedLoaderRepository3 at 166a22b , MBean Attribute. 

how come

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