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From "Karthick Sankarachary (JIRA)" <>
Subject [jira] Created: (AXIS2-4213) Dead Letter Queue Based Recovery
Date Sat, 17 Jan 2009 01:05:59 GMT
Dead Letter Queue Based Recovery

                 Key: AXIS2-4213
             Project: Axis 2.0 (Axis2)
          Issue Type: Improvement
          Components: kernel
    Affects Versions: 1.3
            Reporter: Karthick Sankarachary
             Fix For: 1.3
         Attachments: dead-letter-queue.patch

Currently, when the server receives a JMS message that cannot be delivered to a service, it
simply drops it. By the same token, when the server fails to deliver a JMS message to an external
service, it is lost forever. This leaves users guessing as to what was in that message and
why the delivery failed. Furthermore, there is no way for them to manually retry the delivery,
even if they have the know-how to correct the problem.

Typically, message brokers employ a dead letter queue, in which to store undeliverable messages.
This allows users to not only track such messages, but also retry delivery of some of them.
A few brokers even go to the extent of customizing the dead letter queue based on who is sending
or receiving the message. This way, users can quickly identify the messages that they are
specifically interested in.

Let us try to apply these concepts to Axis2. Strictly speaking, the JMS transport of Axis2
is not a JMS broker, but it does create JMS consumers and producers, which have to handle
delivery failures, as you might imagine. In the event of such failures, the message should
be sent to a default dead letter queue, the scope of which is system-wide. If so desired,
the user may override the default location of the dead letter queue by specifying a message
context property or client option. For more details, please refer to the patch that is attached

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