Dear colleagues, My onMessage method of MDB calls session bean that performs database operations. Some database errors (constraint violation, etc.) are normal cases and should not cause message redelivery. So I wrapped the whole onMessage code into the try..catch . But even if I catch all Exceptions and even Throwables, message is being redelivered. When no error happens, it is not being redelivered. How to avoid this unwanted redelivery ? Thank you. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4080433#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...