Robbie Gemmell resolved PROTON-853.
       Resolution: Fixed
    Fix Version/s: 0.9.1

> [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: 0.9.1, 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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