Hi Mani
Mani wrote:
>
> Hello,
> I've couple of questions regarding EJB and JMS Integration. I read an article about
>EJB and JMS, which says
> "EJBs are not allowed to create threads, so it can't create a thread to call
>QueueReceiver.receive() to receive the messages from JMS".
> 1. If my EnterpriseBean doesn't want to receive any messages from JMS and
>interested in only putting the messages to the JMS, can I use JMS ?
Yes. You can also recieve messages, but you have to do it in a pseudo EJB client - not
a nice solution. Later EJB specs will clarify this.
>
> The same article also mentioned "EJB app servers are not integrated (I know some of
>the EJB app servers are integrated with JMS. But I'd like to know the issues if an
>app server is not integrated), JMS can't invoke the onMessage callback of EJBs within
>the EJBContainer
> 2. If my EnterpriseBean is not interested in notifications from JMS what other
>problems I'll have?
Data consistancy.
>
> Suppose if I'm using an EJB app server that is integrated with JMS, if I add a
>message from an EnterpriseBean to JMS within a Transactional context, how the
>transactional integrity is preserved as the message is added from the
>EnterpriseBean's transactional context to the JMS?
JMS supports the use of transactions so _should_ be seamless. In practice your mileage
may
vary. Note that the JMS terminus client also needs to be transaction aware.
>
> I'm trying to understand the issues behind creating threads, using JMS from an
>EnterpriseBean. Any pointers on the net will help me a lot.
Don't. The only place you can create threads is outside the EJB container, typically
in a startup class for the EJB containers' JVM. You can also use a thread external
to the container to create more threads.
>
> Thanks for your Time
>
> -Mani
>
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Joel Crisp, Senior Java Architect, SUN PS Java Center (UK)
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