Multiple J2EE applications on iAS904

Hi,
We will be having lots of J2EE applications deploy on iAS904. Is the best practice for this to have 1 OC4J per J2EE application? Or all J2EE applications in one OC4J container?
Thanks,
Charles

Hi Charles --
It's difficult to provide a single best practice. You'll need to look at the pros/cons of each and decide what makes most sense for your environment:
To get the ball rolling, here are some considerations:
1 OC4J instance per app:
+ finer grained manageability -- you can make changes to the one app which may require a start/stop of the app or the instance, which won't have any effect on other running apps/OC4J instances
+ The container level log files will just contain information pertaining to that one specific application
+ The OC4J instances can be tuned specifically for the application -- ie JVM settings
+ Clustering can be targetted for the single app -- if you have multiple applications per OC4J instance, then they all will participate in clustering if it is enabled (and they are clusterable). One app per OC4J instance produces a finer grained cluster model.
- Each OC4J instance is a JVM process. If each app has a JVM process then you may be wasting resouces on the system as the apps aren't sharing a JVM
- More management operations may be required since you may need to configure/maintain more instance information
I'm sure some other folks will chime in here with some more insight on their practical experiences.
There's an Oracle Application Server Best Practices document on OTN which I seem to remember does have some coverage of management/deployment issues which may some more information for you to consider.
cheers
-steve-

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PS - Points will be definitely rewarded

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Multiple J2EE applications on iAS904

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