[jboss-user] [EJB 3.0] - stop a running/hanging MDB/EJB instance

[Christian Lorenz]

Christian Lorenz [http://community.jboss.org/people/ChrLorenz] created the discussion

"stop a running/hanging MDB/EJB instance"

To view the discussion, visit: http://community.jboss.org/message/560636#560636

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Hi!

I'm developing an application which must download some files via HTTP/FTP. This is done by an MDB, which uses a specific client for the protocols (e.g. Java URLConnection, etc.). As this downloads are triggered periodically via JBoss TimerService I have a problem, if the connection hangs. Because in this case I get no Exception, the MDB will simply hang infinitely.

*Is there any way to stop a running MDB instance from outside (at best automatically by JBoss)?* Because I'm using the "@Pool"-annotation with "maxSize=5" to reduce the number of concurrent network connections, I'm out of available instances if some MDBs hang.

I've tried some ideas so far, but without success:
* "@TransactionTimeout(...)" respectively "@ActivationConfigProperty(propertyName = "transactionTimeout", propertyValue = "...")": This stops the transaction indeed, but the MDB is still running and not released/destroyed.
* "@Pool(timeout=...)": But this only rejects new requests from execution.

I'm using EJB3 on JBoss 5.1.0 AS.

Thanks in advance!
CHRISTIAN
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