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From Reinhard Poetz <>
Subject Re: Cocoon 2.2 - Build and deployment with Maven2
Date Wed, 07 Dec 2005 16:46:34 GMT
Marc Portier wrote:
> Reinhard Poetz wrote:
>>Today, Jorg and I had a long chat about this. In short, we failed to
>>find a solution that works with Maven 2 as it is today. The problem is
>>that Cocoon block requirements have a different purpose than Maven 2
>>dependencies. Cocoon block requirements desribe what a block needs to
>>run while Maven 2 dependencies describe what a project needs to compile.
>>Additionally we want to describe our dependencies as contracts and not
>>as direct dependencies to a JAR.
> how is that different?

well, in Cocoon we don't have "direct" dependencies between blocks. A Cocoon 
block only requires other blocks that implement a certain contract. Have a look 
at this example:

<block xmlns=""



Here the block "" requires a block 
that implements the contract "".

One block that obiously implements this contract is 

Compare this with a Maven project descriptor. There we say which *concrete" 
dependencies (jars, blocks) one project has. In this special case this is a 
block dependency.

 > I would guess this just means your 'contract' is available in a separate
 > jar/artifact from your implementation?

I'm not sure if I understand completly what you're asking/suggesting here. Do 
you mean that we should make the contract a JAR dependency too?

 > is that a constraint that is hard to keep up with?

I'm not sure. I have to think more about it. In any case, having the contracts 
as JAR dependencies is an interesting thought!

Reinhard Pötz           Independent Consultant, Trainer & (IT)-Coach
{Software Engineering, Open Source, Web Applications, Apache Cocoon}


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