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From "Ray Ward (JIRA)" <j...@codehaus.org>
Subject [jira] Created: (MNG-2192) Transitive dependency overrides version specified in POM
Date Thu, 30 Mar 2006 13:56:44 GMT
Transitive dependency overrides version specified in POM
--------------------------------------------------------

         Key: MNG-2192
         URL: http://jira.codehaus.org/browse/MNG-2192
     Project: Maven 2
        Type: Bug

  Components: Dependencies  
    Versions: 2.0.2, 2.0.3    
    Reporter: Ray Ward


I'm seeing this in both 2.0.2 and 2.0.3, but not in 1.0.2.  I specify a version for a dependency
in the parent pom.xml.  As the build goes on, one or more dependencies will be processed in
the modules that have earlier versions, and those earlier versions override the version I
specified in pom.xml. 
 
For example:
                <dependency>
                        <groupId>commons-collections</groupId>
                        <artifactId>commons-collections</artifactId>
                        <version> 3.1</version>
                </dependency>
 
Then from the log:
...
[DEBUG]   struts:struts:jar:1.2.4:compile (selected for compile)
[DEBUG]     oro:oro:jar:2.0.7:compile (selected for compile)
[DEBUG]     commons-logging:commons-logging:jar:1.0.4:compile (selected for compile) 
[DEBUG]     commons-fileupload:commons-fileupload:jar:1.0:compile (selected for compile)
[DEBUG]     commons-collections:commons-collections:jar:2.1:compile (selected for compile)
[DEBUG]     commons-beanutils:commons-beanutils:jar: 1.6.1:compile (selected for compile)
[DEBUG]       commons-logging:commons-logging:jar:1.0:compile (removed - nearer found: 1.0.4)
[DEBUG]       commons-collections:commons-collections:jar:2.0:compile (removed - nearer found:
2.1)
[DEBUG]     commons-digester:commons-digester:jar:1.5:compile (selected for compile)
[DEBUG]       commons-beanutils:commons-beanutils:jar:1.6:compile (removed - nearer found:
1.6.1)
...
 
And what is in the WAR file is:
[DEBUG] adding entry WEB-INF/lib/commons-collections-2.1.jar
(verified this from the .war file)
 
This is contrary to the documentation on the web site:
http://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html
Which says:  
Dependency mediation - this determines what version of a dependency will be used when multiple
versions of an artifact are encountered. Currently, Maven 2.0 only supports using the "nearest
definition" - so you can always guarantee a version by declaring it explicitly in your project's
POM. 
I take this to mean that the POM is based on the parent pom.xml in a multiproject build, and
the modules should inherit the version setting from the parent.  So I haven't tried to specify
the version again in a child pom.xml.

I came across this while converting a project from M1 to M2.  The M1 WAR file contains version
3.1, as expected.

Hope to include a simple pom.xml to demo this later -- schedule crunch at the moment precludes
doing it now.

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