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++ A note about logging
One of the main differences between Tomcat and JBoss AS that many people struggle with is how logging is handled, specifically commons-logging. In Tomcat, logging can be configured from within the application, thus allowing you to have different appenders and log levels per application. JBoss AS centralized logging so you only need a single log configuration file.
When deploying to JBoss AS or Tomcat with Embedded JBoss, you configure all logging in one place. Deploying a Seam application to Tomcat without Embedded JBoss works just like any other WAR file deployed to Tomcat. So you simply add log4j.xml (or log4j.properties) to your classpath (WEB-INF/classes) and you can configure logging however you please!