How can I add more fine grained logging to the server.log file of JBoss 5 or JBoss 6 AS for the JAAS authentication process in web applications? Currently I can only see that the login fails but no exact reason like JDBC connection failure, JNDI errors or bad username / password.

Many thanks in advance! (p.s. also posted on Stackoverflow - http://stackoverflow.com/questions/6150796/how-can-i-enable-logging-of-jaas-authentication-errors-in-jboss-as-5-6

Michael