"nanda_kishore" wrote : i removed all %JBOSS_HOME%/server/< serverName>/deploy folder/messaging files and i removed hssql-ds.xml . | Any specific reason for doing this? The DefaultDS is used at multiple places in JBoss (as you see in the exceptions) and removing it will result in problems at multiple places. If you are trying to slim down your server, then have a look at http://www.jboss.org/community/docs/DOC-10217 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4185970#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...