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https://issues.apache.org/jira/browse/DBCP-484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16434549#comment-16434549
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Gary Gregory commented on DBCP-484:
-----------------------------------

Nice find in Apache MQ [~zhfeng]! 

I'm curious if anyone in our community has any thoughts here? Because Apache MQ 
uses it in their tests does not make it right, but I would hope that they've 
validated this dependency...

Gary

> Connection leak during XATransaction in high load
> -------------------------------------------------
>
>                 Key: DBCP-484
>                 URL: https://issues.apache.org/jira/browse/DBCP-484
>             Project: Commons Dbcp
>          Issue Type: Bug
>    Affects Versions: 2.2.0
>            Reporter: Emanuel Freitas
>            Priority: Major
>         Attachments: dbcp-test.zip
>
>
> We're experiencing a connection leak in a distributed transaction when the 
> system is under heavy load. We're using commons-dbcp (latest version) + 
> eclipselink and narayana to perform transaction coordination.
> From time to time we can see a stacktrace reporting an abandoned connection. 
> We are trying to figure out what's the root cause and we think that might be 
> some issue in the commons dbcp (not sure) . More specifically, this parte of 
> the code:
> ManagedConnection#updateTransactionStatus
> {code:java}
> if (transactionContext != null) {
>     if (transactionContext.isActive()) {
>         if (transactionContext != 
> transactionRegistry.getActiveTransactionContext()) {
>             throw new SQLException("Connection can not be used while enlisted 
> in another transaction");
>         }
>         return;
>     }
>     // transaction should have been cleared up by TransactionContextListener, 
> but in
>     // rare cases another lister could have registered which uses the 
> connection before
>     // our listener is called.  In that rare case, trigger the transaction 
> complete call now
>     transactionComplete();    
> }{code}
>  
> If the transactionContext is different than null but the state is not 
> "active" (ex: STATUS_ROLLEDBACK, STATUS_ROLLING_BACK, etc) it executes the 
> transactionComplete mothod that clears the reference to a shared connection 
> and after that the connection is never closed (returned to the pool). 
>  
> If we move the transactionComplete(); to an else,(see below), the connection 
> leak does not happen.
> {code:java}
> if (transactionContext != null) {
>     if (transactionContext.isActive()) {
>         if (transactionContext != 
> transactionRegistry.getActiveTransactionContext()) {
>             throw new SQLException("Connection can not be used while enlisted 
> in another transaction");
>         }
>         return;
>     }
> } else {
>     transactionComplete();
> }{code}
>  
> After this the dbcp unit tests still pass but I'm not sure about this 
> changes. Can you please check?
> Thanks
>  



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