[jira] [Updated] (PROTON-853) [proton-j] the transport emitted a new link attach for a link in the process of being detached

["Robbie Gemmell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PROTON-853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robbie Gemmell updated PROTON-853:
----------------------------------
    Fix Version/s: 0.10

> [proton-j] the transport emitted a new link attach for a link in the process of being detached
> ----------------------------------------------------------------------------------------------
>
>                 Key: PROTON-853
>                 URL: https://issues.apache.org/jira/browse/PROTON-853
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: proton-j
>    Affects Versions: 0.9
>            Reporter: Robbie Gemmell
>            Assignee: Robbie Gemmell
>             Fix For: 0.10
>
>
> When upgrading to use 0.9 for the JMS client, we see some NPEs on the client as it tries processing the events being emitted by the connection. This was due to multiple link attach and detach frames arriving in the for the same consumer link.
> What appears to be happening is that while closing the consumer, after the client emits its detach frame proton then emits a new attach frame for the link, before the server responds to the original detach, even though the client made no attempt to recreate the consumer. It looks like the clients handling of a flow frame which arrived after it emitted the original detach meant that the link was modified, and the transport reacted by sending out a new attach. This appears to be due to a change made in 0.9 for PROTON-154.



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