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http://jira.codehaus.org/browse/MNG-4869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=240135#action_240135
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Joern Huxhorn commented on MNG-4869:
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I just read at http://www.developer.com/open/article.php/3908561/article.htm
"3. Automatic Parent Versioning" that the version of the parent pom will soon
(i.e. in Maven 3.1) be optional.
In that case an explicit version would already resemble an "I really mean it"
marker, making this whole suggestion/issue mostly unnecessary.
My suggestion of printing a warning message was based on the assumption that
the parent version would still be required.
> Warn when relativePath points at parent POM with different version
> ------------------------------------------------------------------
>
> Key: MNG-4869
> URL: http://jira.codehaus.org/browse/MNG-4869
> Project: Maven 2 & 3
> Issue Type: Improvement
> Components: POM
> Affects Versions: 3.0
> Environment: Apache Maven 3.0 (r1004208; 2010-10-04 13:50:56+0200)
> Java version: 1.6.0_20
> Java home: /System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home
> Default locale: en_US, platform encoding: MacRoman
> OS name: "mac os x" version: "10.6.4" arch: "x86_64" Family: "mac"
> Reporter: Joern Huxhorn
> Priority: Trivial
> Attachments: MNG-4869.zip
>
>
> We have the following situation in our project:
> A parent pom containing the following infos:
> {code:xml}
> <properties>
> <jettyVersion>6.1.9</jettyVersion>
> </properties>
> <build>
> <plugins>
> <plugin>
> <groupId>org.mortbay.jetty</groupId>
> <artifactId>maven-jetty-plugin</artifactId>
> <version>${jettyVersion}</version>
> </plugin>
> </plugins>
> </build>
> {code}
> A child module with the following configuration:
> {code:xml}
> <build>
> <plugins>
> <plugin>
> <groupId>org.mortbay.jetty</groupId>
> <artifactId>maven-jetty-plugin</artifactId>
> <dependencies>
> <dependency>
> <groupId>org.mortbay.jetty</groupId>
> <artifactId>jetty-plus</artifactId>
> <version>${jettyVersion}</version>
> </dependency>
> <dependency>
> <groupId>org.mortbay.jetty</groupId>
> <artifactId>jetty-naming</artifactId>
> <version>${jettyVersion}</version>
> </dependency>
> </dependencies>
> </plugin>
> </plugins>
> </build>
> {code}
> The property jettyVersion was added during the latest. The parent pom is the
> first sub-module in the master pom, followed by the other sub-modules
> including the child-module above. All <parent> definitions include correct
> <relativePath> entries.
> Previously, it worked perfectly well to simply build the master pom, which in
> turn built the parent followed by all other sub-modules.
> Since Maven 3, however, this didn't work anymore. Right after the addition of
> the jettyVersion property, Maven 3 complained with the following error:
> {noformat}
> [ERROR] The build could not read 24 projects -> [Help 1]
> [ERROR]
> [ERROR] The project xyz:2.0.0-SNAPSHOT (/path/to/child/pom.xml) has 2 errors
> [ERROR]
> 'build.plugins.plugin[org.mortbay.jetty:maven-jetty-plugin].dependencies.dependency.version'
> for org.mortbay.jetty:jetty-plus:jar must be a valid version but is
> '${jettyVersion}'. @ line 28, column 28
> [ERROR]
> 'build.plugins.plugin[org.mortbay.jetty:maven-jetty-plugin].dependencies.dependency.version'
> for org.mortbay.jetty:jetty-naming:jar must be a valid version but is
> '${jettyVersion}'. @ line 33, column 28
> {noformat}
> Building the parent manually fixed this issue.
> To be precise, our actual project involved another parent level, i.e. the
> parent described above was the parent of parent2 while parent2 was the parent
> of the child module - but I don't think that this is relevant. I'm just
> mentioning it just in case. Again, all <parent> definitions include correct
> <relativePath> entries.
> This worked in Maven 2 so I think it's a regression.
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