I know it's bad form to send a me-too to a mailing list, but:
Hear hear!
At 07:46 09/03/2001 +0100, you wrote:
>Personally,
>I already hate the distinction between local and remote EJBs.
>Any such distinction could be handled by a descriptor. It shouldnt force
>the developer to develop different classed depending on local or remote
>usage.. That sucks so bad my teeth hurt.
>
>WR
>
> > -----Ursprungligt meddelande-----
> > Från: Jeff Schnitzer
> [<mailto:[EMAIL PROTECTED]>mailto:[EMAIL PROTECTED]]
> > Skickat: den 8 mars 2001 08:56
> > Till: Orion-Interest
> > Ämne: Warning: Dependent Objects
> >
> >
> > Heads up:
> >
> > If you're using (or planning to use) Orion's support for EJB2.0
> > dependent objects, you should take note of this thread on the
> > ejb-interest list.
> >
> > Jeff
> >
> > -----Original Message-----
> > From: Sean Neville
> [<mailto:[EMAIL PROTECTED]>mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, March 08, 2001 7:34 AM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Article on dependent objects
> >
> >
> > Dependent objects have already been marked for removal from the spec;
> > moreover, local entities -- probably at least as controversial -- have
> > been
> > introduced both as a partial replacement for pieces of the dependent
> > object
> > concept and to solve the need to permit parameter pass-by-reference.
> >
> > I would guess that the next pfd of the spec (and probably another
> > article
> > from Tyler, followed by another series of intelligent reviews
> > from Dan,
> > Gene, and others on this list) should surface by late April,
> > but in the
> > interests of spreading the info as early as possible to those
> > who don't
> > happen to work for a vendor and thus already have this info (power to
> > the
> > people), here is a quick and completely unofficial
> > description of local
> > vs.
> > remote EJB's as posed to us in another discussion. It is obviously
> > subject
> > to change, and only the EJB and J2EE specs are in any way definitive.
> >
> > Local
> > -----
> > Access only with scope of PM
> > No Transaction attribute
> > No Security check
> > Can expose CMP and CMR fields and local refs
> > PBR parameters
> > Local exception model
> > Signatures use full Java type system
> > Typically fine grained methods
> > High coupling due to PBV side affects and fine grained exposure
> >
> > Remote
> > ------
> > Global access
> > Requires Transaction attribute
> > Requires Security check
> > Prohibits exposure of CMP and CMR fields and local refs
> > PBV parameters
> > Container interposed exceptions
> > Signatures restricted to RMI-IIOP compatible types
> > Typically coarse grained methods
> > As loosely coupled as a procedural object can get
> >
> >
> >
> > -----Original Message-----
> > From: A mailing list for Enterprise JavaBeans development
> > [<mailto:[EMAIL PROTECTED]>mailto:[EMAIL PROTECTED]]On
> Behalf Of Dan Christopherson
> > Sent: Friday, March 02, 2001 12:47 AM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Article on dependent objects
> >
> >
> > On Thu, 1 Mar 2001, Alex Smith wrote:
> >
> > > Dan O'Connor <[EMAIL PROTECTED]> writes:
> > >
> > > >Tyler Jewell, the BEA training director for Java and XML
> > > >technologies, yesterday published an article called "What's Wrong
> > > >with the EJB 2 Specification" at
> > > ><http://www.onjava.com/pub/a/onjava/2001/02/28/ejb.html>http://www.on
> java.com/pub/a/onjava/2001/02/28/ejb.html. In this
> > > >article, he identifies "dependent objects" as what is
> > wrong with the
> > > >EJB 2 specification.
> > >
> > > Good article. I do agree that Tyler's objections are misplaced.
> > >
> > > >First, I would like to correct what I believe was a fairly basic
> > > >technical mistake in Tyler's article. He says, "Dependent objects
> > > >don't require primary keys." I would like to suggest that the
> > > >opposite is the case, and I cite from 9.4.4.1 in the spec (proposed
> > > >final draft): "The dependent object class instance must have a
> > > >primary key value that is unique across all instances of the
> > > >dependent object class."
> > >
> > > This is a mistake in the spec rather than the article -- dependent
> > objects
> > > should not have an identity of their own else they would no
> > longer be
> > > dependent. If you use a relational model to color your perception of
> > the
> > > world, a dependent object may or may not have its "own" (i.e. not
> > composed
> > > from the keys of its parent) primary key. Some data modeling
> > methodologies
> > > recommend creating a unique physical key for each and every
> > entity, a
> > > practice I don't subscribe to. On the other hand if you
> > think in terms
> > of
> > > objects, a dependent object belongs to the parent and
> > therefore cannot
> > have
> > > an identity other than that of its parent.
> > I'd say that the dependent object has no identity that is meaningful
> > outside of the context of its parent. If you have three dependent
> > instances of the same class associated with the same parent, they must
> > have their own identities if you do not consider them
> > equivalent, right?
> >
> > >
> > > I think the spec should provide support for dependent objects with a
> > primary
> > > key but not require it.
> > >
> > > The rest of Dan's comments are right on target.
> > >
> > > Alex Smith
> > > Insight LLC
> > > _________________________________________________________________
> > > Get your FREE download of MSN Explorer at
> <http://explorer.msn.com>http://explorer.msn.com
> > >
> > >
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> > >
> >
> > --
> > Dan Christopherson (danch)
> > nVisia Technical Architect (www.nvisia.com)
> >
> > Opinions expressed are mine and do not neccessarily reflect any
> > position or opinion of nVISIA.
> >
> > --------------------------------------------------------------
> > ----------
> > ---
> > If you're a capitalist and you have the best goods and they're
> > free, you don't have to proselytize, you just have to wait.
> > -Eben Moglen
> >
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--
Dan North
VP Development - Cadrion Software Ltd - +44 (0)20 7355 5160
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