Hmmm. Apparently this is a "feature" in weblogic servers. It can be turned off
in their latest version.
Lou Bona wrote:
> I came across an interesting situation I could some clarification on. I
> was under the impression that objects were always passed by value in the
> EJB world, but I found a situation where that's not happening.
>
> In my system I have an object that I use to pass a set of data from
> client to session bean to entity bean. The client is in one VM the EJBs
> are in another. My client has a remote interface to a session bean, I
> pass the object to the session bean and modify it. The changes are not
> reflected in the client, as expected. However, if I pass this object
> from the session bean to the entity bean, again via a remote interface,
> any changes the entity bean makes to the object are reflected in the
> session bean. In a normal java application this would be expected since
> arguments are passed by reference. But since I'm using RMI (I thought)
> to pass the object between EJBs I would assume that the object is passed
> by value even though it's the same VM, but it appears to be passed by
> reference.
>
> I consider this a problem because I won't know if all my EJBs are going
> to be run in the same VM or not once I move to production and a
> multi-server environment.
>
> Am I missing something? Is this weblogic specific?
>
> VM = JDK 1.2.2
> OS = NT
> server = weblogic 4.5.1
> client = java application
>
> Incidentally, I took the code from the session bean and ran it in the
> client. Results were the same, the local object wasn't affected by
> changes in the remote VM.
>
> Any pointers to reference sources is appreciated,
>
> Lou Bona
> Chief Software Architect
> agentGo.com
>
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