Hi, An error is throw by JBoss 4.0.5 server when deploying a web-app with SEAM-1.1.0/lib/thirdparty-all.jar placed in WEB-INF/lib directory. The same error is reported in: http://wiki.jboss.org/wiki/Wiki.jsp?page=Log4jConflictsInJBoss caused by the presence of log4j and common-logging jars in the thirdparty-all.jar. So, thinking about this type of conflicts that may occur, does the use of thirdparty-all.jar must be encouraged? Thanx Fábio. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3994506#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...