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No its not correct.
Section 7.5.8 , Ejb 2.1
"Clients are not allowed to make concurrent
calls to a stateful session object. If a client-invoked
business
method is in progress on an instance when another
client-invoked call, from the same or different client,
arrives at the same instance of a stateful session
bean class, the container may throw the
java.rmi.RemoteException to the second client[7]
if the client is a remote client, or
the
javax.ejb.EJBException if the client is a
local client. This restriction does not apply to a stateless
session bean because the container routes each
request to a different instance of the session bean
class."
I think there is no standard approach as Andreas said. My problem
is that there is some batch process running and there is jsp page that can
access the same method of ejb which I wanted to avoid. I think I can use statefull session bean so that at least second
client gets the exception.
Thanks
Ashwani
Refer to the EJB spec. The container will not allow multiple threads
to use the same instance of an SLSB. From the spec - "The container must ensure that only one thread can be
executing an instance at any time". Given that, why would you want to
synchronize on an EJB method anyways ? Also, SLSB have no state (no instance
variables). The same principle applies to SFSB in addition to the fact an
instance is tied to a single client.
Tareq
On May 15, 2006, at 2:40 AM, Andreas Berg wrote:
You shouldn't. The only reason to
synchronize a stateless session bean is if your bean is not stateless. Then
ask yourself why you chose a stateless bean for some stateful
purpose.
If you really want to synchronize your SLSB you need
to think about the runtime environment. If all the instances of the SLSB run
in a single JVM, you can use the standard Java synchronization features inside
the bean to synchronize. But this doesn't work with a clustered environment.
AFAIK there is no standard approach to solve this.
Kind regards,
Andreas.
Andreas Berg
Zelfi
AG
Hechtsheimer Straße 33
55131 Mainz
Telefon:
06131-9064850
Telefax: 06131-9064853
Hi,
The client of my
ejb can be an jsp or standalone java class. How can I synchronize access
to the SLSB ejb method? I am using ejb2.0 version
__________________
Regards
Ashwani Kalra
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