how can I keep a kind of "global" object (Singleton) in JBoss?

[David Chen]

Hi, there:

here is my problem:
1. we want to keep a copy of a huge database view in JBoss side (because, the view is huge, so, only one copy will be created, and maintained);
2. when request comes from client, we should check if that copy is outdated or not (less than 10 mins since last update), if outdated, then update the copy from database, otherwise, just send the copy to clients.
3. this component is not used to update database behind (readonly).

We are using Jboss2.4.8, oracle9i. Currently, I think to use RMI Service may be an option for this issue. So, thanks in advance if anyone have any clue for it.

Thanks
David