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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