anonymous wrote : I put the msql-jdk2-service.xml in the correct directory (deploy/jms), the 3 driver libs in the lib (for MSSQL 2000 there are 3 libs necessary, not a single one) dir and I wrote the file for the database connections into the deploy dir (the original hsqldb-ds.xml also is in the dir or even more errors occure): | Are you trying to replace HSQLDB with MSSQL? Looks like the changes that you did in the deploy/jms folder might have resulted in this error. If at all you are trying to switch to MSSQL DB for persistence instead of the default HSQLDB then go through http://wiki.jboss.org/wiki/Wiki.jsp?page=ConfigJBossMQDB. There are 2 approaches mentioned in that wiki article, choose the one which best suits you. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4120404#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...