|Using local interfaces from web would be stupid I agree.
I am not sure that is true, nor what he says.
In fact we already use "local" stuff in the optimized version. I guess it
wouldn't be portable that's all and would limit your deployment option. But
since we automate that already in the current base it is kind of a moot
point. All the spec has bought us in this case is "portability" but the
feature is the same :( -> mucho code and little gain
marcf
|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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|> >
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|>
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