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https://issues.apache.org/jira/browse/PROTON-853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14511214#comment-14511214
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ASF subversion and git services commented on PROTON-853:
--------------------------------------------------------

Commit 7fa680794b7d78906129216471170dc7d720b156 in qpid-proton's branch 
refs/heads/0.9.x from Robert Gemmell
[ https://git-wip-us.apache.org/repos/asf?p=qpid-proton.git;h=7fa6807 ]

PROTON-853: dont return the cached links if they are already in the closed 
state, instead create a new object and ensure the old links also get freed. 
Also fixes similar behaviour as in PROTON-850.

This closes #21

(cherry picked from commit f2d7d669155a2ca57606c9381f4f1720739be79b)


> [proton-j] the transport emitted a new attach frame for a link in the process 
> of being closed
> ---------------------------------------------------------------------------------------------
>
>                 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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