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From Giacomo Pati <giac...@apache.org>
Subject Re: [M10N] cocoon-jcr
Date Wed, 11 Jan 2006 20:19:22 GMT
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On Wed, 11 Jan 2006, Daniel Fagerstrom wrote:

> Date: Wed, 11 Jan 2006 16:48:10 +0100
> From: Daniel Fagerstrom <danielf@nada.kth.se>
> Reply-To: dev@cocoon.apache.org
> To: dev@cocoon.apache.org
> Subject: Re: [M10N] cocoon-jcr
> 
> Carsten Ziegeler wrote:
> ...
>
>> (And it would be good if people would not forget about the licence file
>> when they add jars)
>> 
>> 
> With M2s transitive dependence handling it is harder to keep track of what we 
> actually depend on. Is there some reporting plugin or switch, so that one can 
> get a report of all dependencies of a block or a multi project POM?
>
> Otherwise we risk to get an unwelcome suprise when we genrate a binary 
> release.

I was to write a mail about it but you raised it before.

We are at the same trap as Maven 1 multiproject concerning dependencies. 
We will fall into it as well (maybe even faster because of transitive 
deps).

BlockA depends on jarB-1.0 which depends on jarC-1.0
BlockD depends on jarE-1.0 which depends on jarC-2.0
BlockF depends on BlockA   and   depends on BlockD

Version 1.0 and 2.0 of jarC are incompatible wrt backward compatibility.

And voila we have the desaster. The above chain might look overseeable 
but imagine the chain is 5 times deeper. You might exclude jarC-2.0 from 
dependency resolution, after a possibly excessive debugging session 
where you finally figured you have a version problem, and hope all still 
runs well.

OSGI blocks may solve this (with classloader isolation) but ATM we don't 
have it.

Anybody solved this in an elegant way

- -- 
Giacomo Pati
Otego AG, Switzerland - http://www.otego.com
Orixo, the XML business alliance - http://www.orixo.com
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