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From Jan Engler <>
Subject Antwort: Re: Antwort: Re: Maven Shade Plugin
Date Fri, 01 Mar 2013 08:11:45 GMT

To prevent any problems, I have now split up the build into two builds 
(api-build and full-jar). I think I will introduce now a third project 
(with pom packaging) that will build up all modules and collect the 
artifacts that are needed. I hope that is a correct strategy to solve the 
problem. I would like to reuse the api.jar and the full.jar as artifacts 
that can be used as dependencies, therefore I take Jörg's comment into 
account, thanks!


Mit freundlichen Grüßen / Best regards

Jan Engler
Central Research & Development

Erwin-Sick-Str. 1
79183 Waldkirch, Germany

Phone +49 7681 202-3214

Von:    Jörg Schaible <>
Datum:  01.03.2013 08:27
Betreff:        Re: Antwort: Re: Maven Shade Plugin

Hi Tim,

Tim Kettler wrote:

> Am 28.02.2013 19:47, schrieb Joachim Durchholz:
>> Am 28.02.2013 16:24, schrieb Jan Engler:
>>> At first: in fact this is only one artifact. The full jar contains all
>>> classes of the dependecies, the api a reduced set (using filtern in 
>>> shade plugin).
>> Is there a (conceivable) Maven build that uses api.jar as a dependency?
>> Then it must be the main artifact at its GAV (groupId/artifact/version)
>> coordinate.
>> Is there a (conceivable) Maven build that uses full.jar as a 
>> Then it must be the main artifact at its GAV coordinate.
>> If both jars need to be main artifacts, they need to go to different 
>> coordinates. Because the dependent projects that need either api.jar or
>> full.jar have no way of specifying which of them they actually need, 
>> dependency section in their poms can only specify the GAV coordinate.
> That's not correct. The classifier is part of the artifact coordinates
> just like group, artifact(name) and version. A POM can just as well
> depend on a secondary artifact:
>    <dependency>
>      <groupId>foo</groupId>
>      <artifactId>bar</artifactId>
>      <version>1.0</version>
>      <classifier>api</classifier>
>    </dependency>
> The complete coordinates of an artifact are GAVTC: group,
> artifact(name), version, type (default is jar), classifier (default is
> empty).

That's not the real problem. What actually *is* a problem, if you depend 
different artifacts that bring both jars as transitive dependencies - you 
cannot exclude e.g. the -api, because for exclusions you can only specify 
GA. :-/

- Jörg

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