"desbonns62" wrote : Thanks for your answer timfox, | | Yes I have. I wrote a small piece of code that store a certain number of messages in a buffer before sending all of them in a single JMS message (that's what I called concatenate). | I said transaction, not message. anonymous wrote : | This increase considerably the performances (it takes quite the same time to send one message than 1000 messages over a JMS message). | But I would like to know if there is a way that Jboss ESB do it for me? | | I have no idea. Have you asked on the JBoss ESB forum? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4225543#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...