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Posted to dev@activemq.apache.org by "Andrei N.Sobchuck (JIRA)" <ji...@apache.org> on 2013/04/05 09:16:15 UTC
[jira] [Created] (AMQ-4441) Race condition in
PooledConnectionFactory.createConnection
Andrei N.Sobchuck created AMQ-4441:
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Summary: 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
`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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