ASF subversion and git services commented on PROTON-853:

Commit f2d7d669155a2ca57606c9381f4f1720739be79b in qpid-proton's branch 
refs/heads/master from Robert Gemmell
[ https://git-wip-us.apache.org/repos/asf?p=qpid-proton.git;h=f2d7d66 ]

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

> [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
> 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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