EJB Home Factory

[Arijit Ghosh]

I plan to implement EJB Home Factory but this involves caching oh EJB Home.
Can anyone tell me whether JBOSS and JONAS allows stale homes ?

[Tim Holloway]

Yes. It's common practice to cache the Home interface in order to avoid the JNDI overhead, and, in fact, I'm preparing to publish something that does just that.
The downside is that if you hot-redeploy the EJB, the home interface reference will go stale unless you add logic to detect and correct that.

[Arijit Ghosh]

Thanks Tim. But I need something urgently... I am using Jboss. I have edited the necessary web.xml and ejb-jar.xml file.

Now the main thing ---
to write the EJBHome Factory Java file ....
Any pointers ?

[Tim Holloway]

The way I do it is just to create a servlet that runs at server startup. In that servlet's init() method, I lookup the home interface(s) and store them into the application context.

[Simon Brown]

Take a look at Floyd's EJB Design Patterns book on http://www.theserverside.com.
The way that I've done it is simply to have a singleton class through which you can lookup and cache JNDI references. Using a singleton does mean that you may have more than one copy in a cluster, but it does mean that you can use the factory from the presentation (web) and business (ejb) tiers of your architecture.
Simon