JBoss MDB Beginner Question

[babernat]

Hi all, I have a simple question. I'm using JBoss 4.2.3GA and am implementing a message driven bean. Is there a way to pass a MDB runtime configuration via the ejb-jar.xml descriptor?

My MDB requires some additional information to preform its job and I was hoping there was a way to do this via configuration instead of hard-coding values much in the same way you can assign attributes to a MBean via an attribute tag.

Is this possible? If I'm way off base, then where is the best place to do this?

Thanks in advance.

[dvh75]

Don't know if you found your answer or not, but check this out:
http://docs.jboss.org/ejb3/app-server/tutorial/

As described in the injection section, you can do the following:

The @javax.annotation.Resource annotation allows you to inject resources.

@Resource(mappedName="DefaultDS")
private javax.sql.DataSource ds;

If you just need String data, it would look like so:

@Resource(mappedName="MyConfigValue")
private String somevalue;


If you're not using the annotations, just declare a resource in the ejb-jar.xml for you mdb, then do a jndi lookup on it in your bean.

Hope this helps...

[babernat]

Thanks dvh75. Let's talk about the String data for a minute because that is exactly what I need to do. The "MyConfigValue" would have to be exposed in JNDI, correct? If so, how do I configure JBoss to place that value in the JNDI directory?

[jaikiran]

You can use the env-entry element in the ejb-jar.xml and corresponding jboss.xml. Those values get bound to java:comp/env namespace of the component in the JNDI. Look for the dtds of ejb-jar.xml and jboss.xml for more details. Let us know, if you are having trouble in configuring them.

[babernat]

jaikiran,

Thanks for the reply. This is exactly what I needed. Thank you very much for the pointer.