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From "Andrei N.Sobchuck (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AMQ-4441) Race condition in PooledConnectionFactory.createConnection
Date Mon, 08 Apr 2013 07:31:16 GMT

     [ https://issues.apache.org/jira/browse/AMQ-4441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrei N.Sobchuck updated AMQ-4441:
-----------------------------------

    Attachment: AMQ_4441.java

Try attached AMQ_4441. It's not stable (due to nature of the issue) and it can take long time
to crash.
                
> Race condition in PooledConnectionFactory.createConnection
> ----------------------------------------------------------
>
>                 Key: AMQ-4441
>                 URL: https://issues.apache.org/jira/browse/AMQ-4441
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: activemq-pool
>    Affects Versions: 5.8.0
>            Reporter: Andrei N.Sobchuck
>         Attachments: AMQ_4441.java
>
>
> `PooledConnectionFactory.createConnection(String userName, String password)` can return
broken Connection. By `broken` I mean PooledConnection with referenceCount==1, but without
underlying ActiveMQConnection.
> The problem is in lines 
> {code}
> connection = connectionsPool.borrowObject(key);
> ...
> return new PooledConnection(connection);
> {code}
> While method `borrowObject` validates the connection and `new PooledConnection` increments
referenceCount, it's possible that some thread calls `ConnectionPool.decrementReferenceCount()`
just between `borrowObject` and `new PooledConnection`. referenceCount at this stage can be
a zero and the ConnectionPool became closed just prior to `new PooledConnection`.

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