WLS6.1 sp3, jms/mq MDB
Hi
We are using WLS6.1 sp3, accessing MQ through MQ/JMS and Bean managed MDBs. We are managing transaction by throwing Runtime exception and sending the message for requeueing for any issue. We are not using any Messaging bridge approach.
Has any faced any issue with this approach? May be with later SPs or 7.0, does any foresee any problem in this approach?
Thanks
Srinivas
(1) MDB container managed transactions are not
supported in 6.1SP3 for most foreign vendors. This type
of question is pretty common, here is the cut and
paste response:
Start by reading this white-paper on dev2dev.bea.com
"Using Foreign JMS Providers with WebLogic Server"
Be aware that WL 8.1 provides a couple new features that
simplify integration. The white-paper does not cover them:
Resource-Reference JMS Pooling (pooling and auto-enlistment)
Foreign Destination Wrappers (register foreign dest in local JNDI)
See http://edocs.bea.com/wls/docs81/notes/new.html#1160067
(2) Managing the operation by using two different atomic operations
(one for receive, one for send), and failing the send on
certain failures does not guarantee exactly-once. No matter
what messaging system is used. There are fundamental race
conditions that can cause lost or duplicate messages. The
only way to force exactly once when using two atomic operations
is to write the code in such
a way that allows duplicate receives to occur, and to detect if
the received message has already been operated on by
checking a history record that was recorded
for each previous receive. Where the history record
must be written to a database atomically
as part of the send transaction using a transaction.
(3) I recommend using the bridge, or moving up to
version 7.0 or later.
Tom
Srinivas wrote:
> Hi
>
> We are using WLS6.1 sp3, accessing MQ through MQ/JMS and Bean managed MDBs. We are managing transaction by throwing Runtime exception and sending the message for requeueing for any issue. We are not using any Messaging bridge approach.
>
> Has any faced any issue with this approach? May be with later SPs or 7.0, does any foresee any problem in this approach?
>
> Thanks
> Srinivas
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import javax.ejb.TransactionAttributeType;
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Thanks
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And yes, "setRollbackOnly" is the best way to force a rollback of an MDB CMT.
Tom -
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Hello all,
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Best regards
SusanIf you don't want to buy you could try OpenJMS, a free JMS product (http://openjms.sourceforge.net/)
As for learning how to use JMS w/ MDBs, I would suggest grabbing a book on JMS. I found the OReilly book on JMS to be pretty helpful for me.
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