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From nicolas de loof <nicolas.del...@gmail.com>
Subject Re: commons-logging version 0.0.0-EMPTY
Date Tue, 19 May 2009 12:12:06 GMT
A library autor that MAY use cl-0.0 to remove commons-logging from
dependency tree and use SLF4J will anyway have a dependency on cl-over-sfl4j
that solves the ClassNotFoundException
A library that uses slf4j would anyway only declare slf4japi as dependency
and has no reason to force exclusion of commons-logging.


2009/5/19 Ceki Gulcu <ceki@qos.ch>

>
>
> Jörg Schaible wrote:
>
>  Forgive me for asking, but were you aware of the above. And if you
>>> were, would you care to explain a scenario in mind which is troubling
>>> you?
>>>
>>
>> First: The solution is perfect for a normal user i.e. somebody building an
>> application, not a library/framework. The problem starts when somebody
>> publishes some artifacts that explicitly depend on cl-0.0.0-EMPTY:
>>
>> 1. Me building A, depending on B and C
>> 2. B depends on cl-0.0.0-EMPTY
>> 3. C depends on cl-1.1.1
>>
>> According the definition above I get a ClassNotFoundException running A if
>> I
>> declare my dependencies in sequence B, C. Since both deps use CL and A
>> inherits it transitively at equal level, the first one wins => boom.
>>
>
>
> You are correct. In defense of 0.0-EMPTY authors of libraries are not
> supposed to use use cl-0.0-EMPTY. Only end-users should use it. Any
> documentation for cl-0.0-EMPTY would need to emphasize that in bold
> and red print. Moreover, if you are an author of a library, if you
> don't want to use commons-logging, you can simply remove the
> dependency on commons-logging. You would not need cl-0.0-EMPTY at
> all. You would have use for cl-0.0-EMPTY if as an author of a library
> or framework with many dependencies (e.g. wicket, tapestry) you had a
> dependency which in turn depended on commons-logging, (and only if you
> were using Maven and SLF4J).
>
> Stern warnings in the documentation of version 0.0-EMPTY should goad
> authors of shared components away from 0.0-EMPTY. However, I agree
> with you that the risk of misuse of 0.0-EMPTY cannot be completely
> alleviated. It's a tough call to make.
>
>
>  - Jörg
>>
>
> --
> Ceki Gülcü
> Logback: The reliable, generic, fast and flexible logging framework for
> Java.
> http://logback.qos.ch
>
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