I have the same Exception, is there any solution to this problem? My System Windows XP SP2 JBoss 4.0.5 GA Portal 2.4.1 PostgreSQL 8.2 JDK6 - Copied postgresql-8.2-505.jdbc3.jar to server default lib folder - Downloaded the zip version of JBoss 4.0.5 - this works just fine - Downloaded the Portal binaries - made the changes to portal-postgresql-ds.xml to match my db settings. - copied folder jboss-portal.sar and file portal-postgresql-ds.xml to the server default deploy folder. Previously i've tested it with jboss-4.2.0.GA but there i had even more exceptions - i gave up on this setup after several hours on the forum and trying to find a solution. Just installing the bundle isn't a solution for me, because i want to know why errors occur and how i can fix them. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4052665#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...