env: JBoss 4.2.2 + JBoss Messaging 1.4

problem: I have my own LoginModule. All beans and destinations are configured to use it. I have, for example, user with name "user", password "password" and role "role".

When I need to invoke bean's method, I pass username/password through JNDI (SECURITY_PRINCIPAL/SECURITY_CREDENTIALS).
When I need to work with some queue, I do login procedure look like this:

InitialContext ctx = new InitialContext(<don't pass user/pwd here>);
ConnectionFactory cf = (ConnectionFactory) ctx.lookup("/ConnectionFactory");
Connection = cf.createConnection("user", "password"); // pass user/password here
..........................

I do it from client and all works fine. But how I can work with JMS from bean? Now I make it like:

@RolesAllowed(value="role")
public void someBeanMethod() {
 String currentUser = sessionContext.getPrincipal().getName(); // username, who invoked this bean's method
 String password = getPasswordFromDatabase(currentUser); // get password from db
 InitialContext ctx = new InitialContext();
 ConnectionFactory cf = (ConnectionFactory) ctx.lookup("/ConnectionFactory");
 Connection = cf.createConnection(currentUser, password); // I don't want to do it!
 ..............
}

I don't want to do second login actions, because I have done one login when I invoked bean's method. How I can work with JBoss Messaging from bean's method with username/password, who invoked bean's method.


P.S. Sorry for my english, I'm not native speaker.