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From: "maarten.volders@pandora.be" <maarten.volders@telenet.be>
To: jackrabbit-dev@incubator.apache.org
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Message-ID: <W940620535211581128411184@hoboe1bl6.telenet-ops.be>
Date: Tue, 04 Oct 2005 07:33:04 +0000
Subject: JCR + N-Tier architecture design issues: need some help
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Hi,

I'm new to the JCR philosophy and also a little bit confused on how we sh=
ould this new technology in an N-Tier architecture. I'm used on working w=
ith Hibernate, pojo's and ORM mappings in this kind of environment and ha=
ve the following questions about JCR implementations:

Let's take for example a simple blogging website (that's seems to be the =
"hello world" example for JCR :) ... )
- Is JCR only present behind the DAO layer or do the nodes and so travers=
e through all layers
- If the JCR in not shielded behind pojo's and the DAO, I find it difficu=
lt to understand how we should expose JCR retrieved data? Should we use t=
he JCR api also in the presentation layer ... i hope not!!!
- If the JCR is indeed behind the DAO ... how do we go on from the DAO to=
 the presentation layer? Do we still use pojo, for example with a pojo ca=
lled BlogMessage which have references to its parent and child BlogMessag=
es? If so what is the best practise to create and update data that is cha=
nged in these pojo's. I'm a little bit lost with the use of pojo's in com=
bination with JCR!!!
- What about transactions ... is that possible with JCR
- If the JCR impl is backed by i.e. Hibernate ... how will the JCR data w=
ill be saved. Is there still a ORM mapping behind the scenes or how is th=
is done?

So, it would be great that someone explains a real life example on how to=
 use JCR in an N-Tier architecture...

Thanks

M.