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From Mario Wirth <mario.wi...@gmx.net>
Subject Re: What is your strategy to manage dependencies?
Date Tue, 28 Sep 2010 21:29:36 GMT
Thank you Antonio,
for your response. But is this really the only solution? Is there no 
plugin or technique available which helps to avoid (binary) 
compatibility conflicts between artifacts?
Can anyone recommend the use of version ranges?

Thanks,
Mario

Am 24.09.2010 09:47, schrieb Antonio Petrelli:
> 5. Use released versions if possible and resolve conflicts one by one.
>
> Antonio
>
> 2010/9/24 Mario Wirth<mario.wirth@gmx.net>:
>> Hi community,
>>
>> I am interested in your strategy, how to use Maven to make sure, all
>> artifacts are selected in the right version.
>>
>> By default, if you add a dependency with it's version, that is only a wish.
>> Maven is allowed to change the artifact to a newer or an older version. It
>> depends on the dependency tree and the distance to the root. (see:
>> http://www.sonatype.com/books/mvnref-book/reference/pom-relationships-sect-project-dependencies.html#pom-relationships-sect-version-ranges)
>>
>> As a consequence, sometimes my war file contains libs which do not fit
>> together. The following solutions I've figured out so far:
>> 1.Declare all needed dependencies in the pom of the war file. Disadvantage:
>> I have to do the work manually.
>> 2.Use Dependency Management. In my parent pom I can declare all dependencies
>> and their versions. Advantage: I have full control of the dependencies in
>> the child moduls. Disadvantage: If I need to change a version of a
>> particular dependency, I need to release a new version of the parent pom and
>> afterwards I have to update the version number in all child projects which
>> need the new version of the dependency.
>> 3.Use Version Ranges. Advantage: With version ranges I can add more specific
>> informations for Maven. This is used to support the conflict resolution and
>> maven only selects artifacts which satisfy all version ranges. Advantage:
>> conflict resolution does not cause (binary) incompatibilty between the
>> artifacts, if the version ranges are set correct. Disadvantage: There is
>> more effort during the release process: you need to build a release pom with
>> resolved version ranges to make the build repeatable. You have to hide
>> Snapshots during the release process, if you use boundaries like [4.0,). And
>> finally, maven needs additional meta data from the repository. If the meta
>> data are not up to date, strange behaviour can happen.
>> 4.Use only snapshots. If I use only snapshot versions, the latest version is
>> always used. Disadvantage: Developing against snapshots can be frustrating
>> because of the nature of snapshots ;-) But you will find out very fast, if
>> something is binary incompatible.
>>
>> So, I am very interested in the best practise! How do you solve the problem
>> to manage all dependencies in their correct version. Thank you for your
>> suggestions in advance.
>>
>> Mario
>>
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