Write an MBean that does it at start[service]()

// Potential management interface
interface AddUserMBean
extends ServiceMBean
{
ObjectName getStateManager()
void setStateManager(ObjectName value);
String getUser();
void setUser(String value);
String getRoles();
void setRoles(String value);
}

// deployment descriptor
<mbean ...>
<depends optional-attrribute-name="StateManager">jboss.mq:service=StateManager
whatver
etc.

Regards,
Adrian