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Stateless Session Bean

Edy Yu
Ranch Hand

Joined: Nov 21, 2000
Posts: 264
Here is what I understand it:
If I have a instance varible in the stateless session bean and I have two methods. The bean/container won't maintain the instance varible for me between the two method calls. But I tested the scenario in the J2ee server. It appears that the server is maintaining that for me.
Can anybody explain this for me?
Thanks in advance.


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Tim Holloway
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Joined: Jun 25, 2001
Posts: 15959
    
  19

I think you're confusing "not throwing an exception" with maintaining.
You CAN define static variables - or preferably constants, providing you're willing to deal with the multi-tasking consequences. However, instance variables are tied to specific instances, and instances are created, recycled, and destroyed according to rules that don't guarantee that any two invocations - whether from the same client or another - will receive the same instance. The heavier the workload, the more likely that your application will fail unpredictably.
A *REALLY* picky appserver could check the EJB's class files and refuse to deploy anything with instance variables, but regardless, there is a reason why there's a separate type of session EJB for when you need to maintain state.
[ June 10, 2002: Message edited by: Tim Holloway ]

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