On 16.06.2011, at 14:29, Julien Dubois wrote:
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>> 4. Using MDB everywhere
>> MDBs should not be reserved for application servers. We should have "message-driven POJOs" as seen in Spring JMS, by using annotations on a simple Java object.
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> But you will need some kind of a container. IMHO it doesn't matter whether I'm using Spring or Weld or OSGi based EJB container. It won't work with Java SE...
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> It can work with plain Java SE, we don't need a container for that. Last week, I've seen a project which has done its own implementation, which is a simple thread that polls for messages every second. It could be turned on and off, etc...
> Spring JMS does exactly the same thing (it's more advanced as you plug in a thread pool, etc, but it's the same idea). I've seen a lot of Spring Batch, Spring Integration, and Tomcat-based projects use it.
> A simple use case such as receiving messages should be available for everyone, even if they just use plain Java SE. Of course, for more complex use cases we could require Java EE.
O.k. You will need some kind of infrastructure / indirection. The thread will have to pull the messages and invoke a POJO. The POJO will be managed by something. I refer to the "something" as a container.
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>> 5. Clustering and failover
>> As the theme of JEE 7 is "the cloud", there should be some clustering/failover facilities in the specification.
>> For instance, we should be able to configure failover as in ActiveMQ from the standard configuration:
>> http://activemq.apache.org/failover-transport-reference.html
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> So far I know clustering is not specified in other specifications. (except distributable in web.xml). But probably we could introduce the notion of clustering in Java EE 7 in general.
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> I fully agree. Clustering is a wider subject, and should be adressed at the Java EE 7 level. I'm a bit confused here: as far as I understand, "the cloud" is a main theme of Java EE 7, but nobody seems to be working on it...
In Java EE 7 JSR are working on it, but not on clustering.
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> --
> Julien Dubois
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> Twitter: @juliendubois
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