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http://jira.codehaus.org/browse/MNG-4600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benjamin Bentmann updated MNG-4600:
-----------------------------------

    Summary: [regression] Optional flag from dependency management applied to 
dependencies  (was: Dependency not retrieved with maven 3 although it was with 
maven 2)

> [regression] Optional flag from dependency management applied to dependencies
> -----------------------------------------------------------------------------
>
>                 Key: MNG-4600
>                 URL: http://jira.codehaus.org/browse/MNG-4600
>             Project: Maven 2 & 3
>          Issue Type: Bug
>          Components: Dependencies
>    Affects Versions: 3.0-alpha-7
>         Environment: Apache Maven 3.0-alpha-7 (r921173; 2010-03-09 
> 23:31:07+0100)
> Java version: 1.5.0_17
> Java home: c:\projet\MM\outils\jdk\1.5.0\jre
> Default locale: fr_FR, platform encoding: Cp1252
> OS name: "windows xp" version: "5.1" arch: "x86" Family: "windows"
>            Reporter: Baptiste MATHUS
>             Fix For: 3.0-alpha-8
>
>         Attachments: bug-maven.zip
>
>
> The situation is quite complex to explain. I've a parent pom that defines 
> dependencies in depMgmt. There's two projects in the multimodule project, the 
> second depending on the first.
> Excerpt (parent/depMgmt):
> <dependency>
>   <groupId>ch.qos.logback</groupId>
>   <artifactId>logback-classic</artifactId>
>   <version>${logback.version}</version>
>   <scope>runtime</scope>
> <optional>true</optional>
> First child (redefines scope only):
> <dependency>
>  <groupId>ch.qos.logback</groupId>
>  <artifactId>logback-classic</artifactId>
>  <scope>compile</scope>
> </dependency>
> Second child:
> <dependency>
>  <groupId>org.slf4j</groupId>
>  <artifactId>slf4j-api</artifactId>
> </dependency>
> <dependency>
>  <groupId>m3pb</groupId>
>  <artifactId>subproject1</artifactId>
>  <version>${project.version}</version>
> </dependency>
> When running with maven 2, it works. When ran with maven 3, it fails on the 
> second project, with a NoClassDefFoundError on the logback jar.
> I seem to understand this is actually a bug in maven 2: as the depMgmt 
> defines optional=true, it shouldn't have been working in maven2 without 
> redeclaring the dependency in the second project. 
> From my understanding:
> * With maven 2, the transivity is taken in account and gives logback through 
> the subproject1 link (from the second)
> * With maven 3, this just doesn't work and this is the correct behaviour.
> Please excuse my basic analysis. 
> I'm attaching a test project to let see more precisely the problem.
> If you need any help, please let me know.
> Cheers
> -- 
> Baptiste

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