Singleton Message Driven Bean

[jdwright00]

I'm using the @MessageDriven annotation to create Message Driven Beans. Is there a way of ensuring a particular MDB is a singleton? Before we switched to EJB3 we obtained this behaviour by setting the bean's <configuration-name> tag in jboss.xml to Singleton Message Driven Bean.

Under EJB3 I'd have thought there'd be some annotation I could use to do the same thing, but so far have not found anything. Can anyone help?

[lupson]

I am having the same issue. Well, I can have all the MDB instances invoke business logic in a POJO singleton or something like that, but that wouldn't be as neat.

(Basically, a bump!)

[bdecoste]

You can limit the number of MDB instances in the pool to 1 with:

@MessageDriven(activationConfig =
{
...
@ActivationConfigProperty(propertyName="maxPoolSize", propertyValue="1")
}

[lupson]

Thanks! Works as a charm. Implemented the POJO singleton solution first, but this method seems to have better performance, and the messages will be processed in the same order I sent them.