Is it possible to write truly portable code that run in multiple app server and achieve good performance at the same time?
Every app server I used so far has extensions.

Hi,
It is not possible to write truly portable code for ejb application which can be deployed on different containers. I have read that serverside is providing some sort of portability code that is portable across 2-3 containers only.
Dinesh Singh <dpsonline at hotmail dot com>

Well, of course they all have extensions :) You can choose not to use them, get portable code, but miss out on optimizations. I think with some carefull design you can atleast achieve portabillity in most of the codebase, and isolate importable stuff to specific classes.
One notable exception to this is read-only transactions: different containers handle them differently, and they should definately be standartized ASAP, IMHO.

Gal

I started using JBoss and I find it hard to write portable applications for that app server.

I/we use JBoss and have hod no problems porting to and from jboss and other app servers.

Jason

>I started using JBoss and I find it hard to write portable
>applications for that app server.

What application servers do you find it hard to port to, and what problems do you have?

I have ported from Weblogic to JBoss and found that all I needed was minor changes to the deployment descriptors.

This app doesn't use entity beans.

Tom