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http://jira.codehaus.org/browse/MNG-1977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=261614#action_261614
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Rob Elliot commented on MNG-1977:
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Maven definitely makes provided scope dependencies available at compile time -
otherwise no library compiled against the servlet api would compile. A good
example in the logging context would be someone who desired to use
slf4j-over-log4j instead of log4j. Making log4j itself have scope provided
would have the desired runtime behaviour of excluding the log4j jar if any
transitive dependency brought it in, thereby preventing any non-determinate
behaviour depending on which version of the log4j classes the classloader
loaded first; however, at compile time Maven would happily be able to compile
code dependent on classes that are included in log4j but are not in
slf4j-over-log4j, and the user would only discover the problem at runtime.
> Global dependency exclusions
> ----------------------------
>
> Key: MNG-1977
> URL: http://jira.codehaus.org/browse/MNG-1977
> Project: Maven 2 & 3
> Issue Type: New Feature
> Components: POM
> Reporter: Kees de Kooter
> Fix For: 3.1
>
>
> I depend on some libraries, which in turn depend on something
> (which in turn depend on something) that I don't want, because I declare
> some other artifact in my pom.xml.
> A concrete example: I don't want that the artifact "xerces" is imported in
> my project because I declare to depend on "xercesImpl" which ships newer
> libraries but with the same namespaces.
> I guess I would need an "exclude transitive dependency at all", either
> globally or from this and that artifact. I saw the <exclusions> tag, but it
> forces me to be very verbose and have exact control on what is required by a
> dependency.
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