Thank you Dan.
It's clearer now, and even think I prefer this way of working.
Using local interfaces from web would be stupid I agree.
Even between ejb jars seems dangerous to me.
(btw I only have independant ejb jar for the moment, no ears. I will not be
able to verify your remarks(classloading and ejb-link), I keep them under my
pillow...)
Regards.
Vincent.
> -----Message d'origine-----
> De : [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]De la part de Dan
> OConnor
> Envoye : mercredi 8 aout 2001 13:51
> A : Dev JBoss
> Objet : Re: [JBoss-dev] ejb-local-ref and ejb-link
>
>
> Hi Vincent,
>
> The specification does not indicate the limitations of the scope in
> which local interfaces are effective, beyond requiring that they be
> co-located in a JVM. I wish it did, and I advocated a specific
> statement in the spec in a discussion on ejb-interest.
>
> Obviously pass-by-reference semantics will only work when you
> have a common classloader. The classloader scheme is particular
> to an application server implementation. You are 100% safe using
> local references only within a JAR, and you are probably safe using
> local references between JARs in an EAR. (Someone more familiar
> with the current classloading scheme can comment on this.)
>
> In my opinion, you are not portable using local references between
> EARs. It might be supported by JBoss when Marc solves the
> "dumbo" problem, but I still wouldn't recommend this approach.
>
> You didn't ask, but... using local references from the web tier is
> possible. However, it is probably a bad idea. An important
> deployment option is to have the web and business-logic tiers on
> different physical machines, e.g. for security. Using a local
> interface completely forecloses this deployment option.
>
> In terms of ejb-link... because local interfaces probably shouldn't be
> available outside of an EAR, they can always be configured using
> an ejb-link. (In theory, at least, ejb-link can link between JARs in
> an EAR. Does it work in JBoss? Haven't tried it...) So when I
> implemented local interfaces, I required ejb-link rather than
> introducing some funky JNDI publishing scheme.
>
> I'm not the only one to do this. I recently saw some posts to ejb-
> interest from the pramati server team advocating this approach.
> These were after my implementation, and I didn't get the idea from
> them, but they give some confirmation to my approach. For
> example, see http://archives.java.sun.com/cgi-
> bin/wa?A2=ind0107&L=ejb-
> interest&P=R15438&D=0&H=0&O=T&T=1.
>
> There is support for the other point of view. BEA WebLogic 6.1
> requires a JNDI name for the local home interface.
>
> Perhaps the EJB 2.0 final spec will clarify these issues.
>
> -Dan
>
>
> On 8 Aug 01, at 11:57, Vincent Harcq wrote:
>
> > Hi,
> > Currently the container verifies that an ejb-link exists inside an
> > ejb-local-ref.
> > I read through the spec and don't see this is required.
> > In most cases the 2 beans will be in the same jar so no
> problem, but this
> > limitation should not happen imho.
> >
> > A second point:
> > Local interfaces access must be in the same JVM.
> > It is not required they must be in the same JAR or the same EAR.
> > Will this "pass by reference" work into JBoss ?
> > Can 2 ejb jar talk to each other with "pass by reference" if they are
> > deployed separately ?
> >
> > Vincent.
> >
> >
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