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https://issues.apache.org/jira/browse/QPID-6653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15738188#comment-15738188
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Rob Godfrey commented on QPID-6653:
-----------------------------------
This client is no longer supported and has been replaced by the Qpid JMS
client. However this issue would potentially also affect the Java Broker as it
uses the same code, so I am assigning this JIRA to the Java Broker for review
> Earlier Qpid Java client: receiver issue with multi-transfer pre-settled
> messages
> ---------------------------------------------------------------------------------
>
> Key: QPID-6653
> URL: https://issues.apache.org/jira/browse/QPID-6653
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: 0.32
> Reporter: Xin Chen
> Attachments: ReceivingLinkEndpoint.java
>
>
> This issue is regarding the Qpid Java client released as part of the Qpid JMS
> 0.32. https://qpid.apache.org/releases/qpid-0.32/index.html
> When the remote peer sends settled message with multiple transfer frames, it
> could use the same delivery tag (e.g. an empty binary) for all messages. The
> ReceivingLinkEndpoint class keeps track of both unsettled deliveries and
> partially received deliveries in two maps, _unsettledIds and _unsettledMap.
> When user acknowledges a message by calling Receiver.acknowledge(Message),
> the state of the delivery is removed from both maps. This is causing a
> problem if the user acknowledges a previously received message and a new
> message is being partially received (because they share the same delivery
> tag). The observed symptom is receiver stuck and NullPointerException from
> connection's frame pump when decoding frame buffers.
> I attempted a fix by using a new variable to remember the last received
> partial delivery, if any, and only putting unsettled deliveries into the two
> maps. It worked in this particular scenario. The existing tests are passing
> with this change but I am not completely sure if it has any side effects.
> I will attach a modified ReceivingLinkEndpoint.Java file so you can take a
> look.
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