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From Jean-Christophe Kermagoret <>
Subject Re: Circular references with servlet service in C22
Date Thu, 16 Aug 2007 15:20:45 GMT
I'm ok with you about circular dependencies. They are bad practice and 
must be avoided. But if I could save my time and concentrate on bugs 
which are important for my work, I would prefer. Then, I could come back 
later on this new architecture constraints.

I'm just realizing that moving from C21 to C22 will take more time, even 
if it's for a better world ;-)


Grzegorz Kossakowski a écrit :
> Jean-Christophe Kermagoret pisze:
>> Hi,
>> I'm not talking about inheritance, only usage relationships.
> I pointed you to that discussion to give you how good design can 
> eliminate a need for circular dependencies.
>> For example, I have 2 services :
>> * locator, which locates resources
>> * common, which provides common stylesheets
>> Each service is using the other one, not in a fallback mechanism. I'm 
>> surprised this behavior is not allowed.
> Could you show some flow between locator and common so I can get 
> better of idea of each block's role?
>> With C21, I could use mount table to describe where my services were 
>> located. How may I design this in C22 ? Is servlet: the right choice 
>> in my case ?
> To give you exact advice I need more details about your use case.
> As general note, block is not only about sitemap in C2.2, it's also a 
> reusable unit packaged with Maven.
> With regard to circular dependencies:
> a) Maven does not allow artifacts in circular dependencies (and you 
> always get the answer that your design is probably flawed when you 
> need them)
> b) Spring does not allow beans to depend on themselves in circle (with 
> exceptions, though). You get more or less the same answer as from 
> Maven folks if you question this behaviour.
> Don't you think that common wisdom of these communities can't be wrong?
> Even though it was possible with Cocoon 2.1, in Cocoon 2.2 we are 
> trying to live in better harmony with rest of the world. That's one of 
> consequences.

Jean-Christophe Kermagoret,
OpenBlueLab Technological Leader

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