On Thu, May 7, 2009 at 1:10 PM, Ylan Segal <ylan.se...@gmail.com> wrote:
> I have a conflict with a jdom dependency: Two versions are appearing in my
> classpath.
>
> The problem arises because my project uses the follwing two dependencies:
>
>
> <dependency>
> <groupId>jdom</groupId>
> <artifactId>jdom</artifactId>
> <version>1.1</version>
> </dependency>
> <dependency>
> <groupId>rome</groupId>
> <artifactId>rome</artifactId>
> <version>0.9</version>
> </dependency>
>
>
> Now, rome in turn uses:
>
> <dependency>
> <groupId>jdom</groupId>
> <artifactId>jdom</artifactId>
> <version>1.0</version>
> </dependency>
>
> According to my (limited) understanding of maven, since I am explicitly
> stating that my project uses jdom 1.1, that should take precedence and jdom
> 1.0 should not be included.
>
> Now, when I check the dependency tree I see that:
>
> com.mydomain:myproject-1.0-SNAPSHOT
> + org.jdom:jdom:jar:1.0 (compile)
> + rome:rome:jar:0.9 (compile
> + jdom:jdom:jar:1.0 (compile)
>
> Notice that groupID for the two jdom versions are different. It's jdom for
> 1.0 but org.jdom for 1.1. I believe that this is why maven is actually using
> both dependencies: It doesn't know that they are different versions of the
> same artifact.
>
> (By the way I tried setting my dependecy's groupId to org.jdom or jdom and I
> get the same result: Somehow even if I specify jdom as the groupId it
> resolves to org.jdom).
>
> Does anyone have any suggestions on how to address this?
You can exclude the rome's transitive jdom dependency like this (from
the top of my head):
<dependency>
<groupId>rome</groupId>
<artifactId>rome</artifactId>
<version>0.9</version>
<exclusions>
<exclusion>
<groupId>jdom</groupId>
<artifactId>jdom</artifactId>
</exclusion>
</exclusions>
</dependency>
As far as I know Maven does not automatically resolve version
conflicts between (transitive) dependencies, you just end up with both
versions of the jar.
HTH,
Niels
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