Yeah, I think there could be some ire over the 2.0 changes.
>From: Dave Wolf <[EMAIL PROTECTED]>
>Reply-To: A mailing list for Enterprise JavaBeans development
><[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: Re: Null or empty collection
>Date: Mon, 19 Feb 2001 22:38:20 -0500
>
>But this goes back to my point on releasing specs early is not a good thing
>or in the communities interests. See the early public drafts of EJB 1.1
>still had the confusing phrasing of saying a "null collection" was
>returned.
>Some containers (Ill be polite) who released EJB 1.1 early implemented this
>as per the confusing phrase, this allowing you to return a null collection
>rather then an empty collection. This caused developers to implement their
>finders illegally by returning null collections, leading to big portability
>issues. I still contend that releasing implementations of specifications
>before they are final is a dis-service to the community. Developers should
>be very aware that by implementing applications early using containers with
>partial, pre-released implementations of a specification put them at a
>significatn portability risk. Since one of EJB's biggest advantages is
>portability, you should approach such pre-release implementations with care
>and forethought.
>
>Dave Wolf
>Internet Applications Division
>Sybase
>
>
>
>
>----- Original Message -----
>From: "Dan Christopherson" <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>
>Sent: Friday, February 16, 2001 5:43 PM
>Subject: Re: Null or empty collection
>
>
> > As others have pointed out, the spec is quite clear that it should be an
> > empty collection and that this is a collection containing 0 elements.
> >
> > On Sat, 17 Feb 2001, Wong Kok Wai wrote:
> >
> > > The JavaDoc for ObjectNotFoundException put it as:
> > >
> > > <quote>
> > > This exception should not be thrown by
> > > finder methods that return a collection of EJB objects (they should
>return a null
> > > collection instead).
> > > </quote>
> > >
> > > Let me rephrase my original question: is there a difference between a
>null
> > > collection and an empty collection? To me, they mean different things.
> > >
> > > Dan Christopherson wrote:
> > >
> > > > You don't throw ObjectNotFoundException in this case: it's
>documentation
> > > > just included a red herring on the real issue.
> > > >
> > > > >From the 1.1 spec, section 9.1.9.4:
> > > > "Only single-object finders (see Subsection 9.1.8) should throw this
> > > > exception. Multi-object finders must not throw this exception.
> > > > Multi-object finders should return an empty collection as an
>indication
> > > > that no matching objects were found."
> > > >
> > > > On Fri, 16 Feb 2001, Tim Endres wrote:
> > > >
> > > > > Maybe I do not understand the question, but if you are throwing an
> > > > > ObjectNotFoundException, isn't the returned value meaningless?
> > > > >
> > > > > tim.
> > > > >
> > > > > > I'm a bit confused what should be returned by finders that
>return
> > > > > > multiple objects. In the EJB 1.1 specs, it is stated an empty
>collection
> > > > > > should be returned. However, in the JavaDocs for
> > > > > > ObjectNotFoundException, it is stated a null collection should
>be
> > > > > > returned. My understanding is null collection is null, and an
>empty
> > > > > > collection is a collection with zero elements. So which should I
>return
> > > > > > (I prefer the empty collection approach, as it simplifies both
>the
>bean
> > > > > > and client implementations)?
> > > > > >
> > >
> > >
>===========================================================================
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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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> >
>
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