And, by the way, here is a snippet from the javadocs of http://java.sun.com/j2ee/1.4/docs/api/javax/resource/spi/ManagedConnectio... When a ManagedConnectionFactory object is created the log writer is initially null, in other words, logging is disabled. Once a log writer is associated with a ManagedConnectionFactory, logging and tracing for ManagedConnectionFactory instance is enabled. So if you set it, logging is enabled. And that's WRONG! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4123495#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...