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https://issues.apache.org/jira/browse/CAMEL-25947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18132245#comment-18132245
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Claus Ibsen commented on CAMEL-25947:
-------------------------------------
Fixed by https://github.com/apache/camel/pull/28465, merged to main as
9886c771001723f417772fb900603ab475734044 (Camel 4.24.0).
_Claude Code on behalf of davsclaus_
> camel-spring-rabbitmq - with confirm=auto the producer does not wait for
> publisher confirms of type SIMPLE, so a message RabbitMQ negatively
> acknowledges or does not confirm is lost without an error
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: CAMEL-25947
> URL: https://issues.apache.org/jira/browse/CAMEL-25947
> Project: Camel
> Issue Type: Bug
> Components: camel-spring-rabbitmq
> Reporter: shashank
> Assignee: shashank
> Priority: Major
> Fix For: 4.24.0
>
>
> With the default {{confirm=auto}}, the InOnly producer
> ({{SpringRabbitMQProducer.processInOnly}}, main 9f839f4bcc9d) decides whether
> to wait for publisher confirms with
> {{getConnectionFactory().isPublisherConfirms()}}. In spring-rabbit 4.1.1,
> {{CachingConnectionFactory.isPublisherConfirms()}} is
> {{ConfirmType.CORRELATED.equals(confirmType)}}. A connection factory with
> publisher confirms of type {{SIMPLE}} answers {{isSimplePublisherConfirms()}}
> instead (javap of both methods), and {{SIMPLE}} is the type that
> {{RabbitTemplate.invoke}} plus {{waitForConfirms}} is meant for. So with
> {{spring.rabbitmq.publisher-confirm-type=simple}}, or
> {{setPublisherConfirmType(ConfirmType.SIMPLE)}}, the producer:
> * puts the channel in confirm mode (the connection factory does that) but
> never waits for the confirm;
> * completes the exchange as soon as {{basicPublish}} returns. A message that
> RabbitMQ negatively acknowledges (for example a full queue with
> {{x-overflow=reject-publish}}), or never confirms (a broker that goes down
> before the message is written), is lost without an error. That is what
> publisher confirms were configured to prevent, and the option documentation
> says "auto = Camel detects if the connection factory uses confirms or not".
> *Fix*: {{confirm=auto}} waits when the connection factory has publisher
> confirms of either type ({{isPublisherConfirms() ||
> isSimplePublisherConfirms()}}). {{RabbitTemplate.waitForConfirms(long)}}
> returns {{false}} only for a negative acknowledgement, so the
> {{TimeoutException}} of that case now says "Message negatively acknowledged
> by RabbitMQ". When no confirm arrives within {{confirmTimeout}}, amqp-client
> 5.31.0 {{ChannelN.waitForConfirms}} throws
> {{java.util.concurrent.TimeoutException}}, which {{RabbitTemplate}} turns
> into an {{AmqpTimeoutException}} (javap of both); that fails the exchange.
> Upgrade guide entry: such producers now wait up to {{confirmTimeout}} per
> message and fail on a negative acknowledgement or a missing confirm;
> {{confirm=disabled}} keeps the old behaviour.
> *Tests*: new {{SpringRabbitMQProducerConfirmTest}}. It uses a real
> {{CachingConnectionFactory}} over a mocked RabbitMQ client. The mocked
> {{Channel.waitForConfirms(long)}} answers as the client documents: {{true}}
> when everything was acked, {{false}} when a message was nacked, and a
> {{TimeoutException}} when the timeout elapses. Three tests fail on main:
> * {{negativeAcknowledgementFailsTheExchangeWithSimplePublisherConfirms}}:
> {{expected: <java.util.concurrent.TimeoutException> but was: <null>}};
> * {{missingConfirmFailsTheExchangeWithSimplePublisherConfirms}}: {{expected:
> <org.springframework.amqp.AmqpTimeoutException> but was: <null>}};
> * {{acknowledgedMessageIsSentWithSimplePublisherConfirms}}: {{Wanted but not
> invoked: channel.waitForConfirms(5000L)}}.
> Two controls pass on main and with the fix: {{CORRELATED}} still waits, and
> no confirms means no wait.
> camel-spring-rabbitmq unit tests with the fix: 11 run, 0 failures.
> *How it was found*: library-contract mining. I read which
> {{ConnectionFactory}} method reports which confirm type in spring-rabbit
> 4.1.1, and checked the producer's {{auto}} detection against it.
> *Affected*: main, camel-4.23.x, camel-4.22.x, camel-4.18.x and camel-4.14.x
> (the same {{isPublisherConfirms()}} check). I read the code on those branches
> but did not run the tests there.
> _Filed with Claude Code on behalf of allthingssecurity._
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