JMS MDB manual rollback possible ?

Question

Hi,
I want to know if it's possible to manually roll back a message if something goes wrong ?
I have a Message Driven Bean that receives a message and sends it over http to another component. Now I want to make sure that my message isn't lost. So in case of an http timeout I want the message to be put back on the queue in front of following messages.
As I read before, a message is removed from its JMS Queue in case the onMessage method of the bean completes, so in my code
public void onMessage(Message message){
try{
//send message over http
}catch(Exception e){
//this is where I want the message to be roll-backed
As it is now, if there is an http timeout, an axception will be catched, but the onmessage method will still be executed successfully, and the message will be removed from the queue, result, a loss of the message.
is this possible with standard jms ?
kind regards
Bert

Answer 1

It is certainly possible, but it depends on how your application is working.
if you are working with beans: No problem, just set the MessageDrivenContext.SetRollBackOnly() -> rolls back the transaction! (in case of Container managed transaction), if you are using your own transactions, simply roll them back your self.
If you are not using beans, you simply do not acknowledge your message, for JMS a message needs to be acknowledged before it assumes that it is delivered. So set your ACK_MODE to CLIENT_ACKNOWLEDGE and in case of an exception do not acknowledge it, otherwise, do acknowledge it.
Since you are using a MDB the first solution should be used in your case.