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POWarning on using project.parent.version as the version of a module in Maven 3
 

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  1. POWarning on using project.parent.version as the version of a module in Maven 3
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    <p>In maven multi-module projects where I want each of the modules to always keep the same version as the parent, I've typically done something like the following in the module's pom.xml:</p> <pre class="lang-xml prettyprint-override"><code> &lt;parent&gt; &lt;groupId&gt;com.groupId&lt;/groupId&gt; &lt;artifactId&gt;parentArtifactId&lt;/artifactId&gt; &lt;version&gt;1.1-SNAPSHOT&lt;/version&gt; &lt;/parent&gt; &lt;groupId&gt;com.groupId&lt;/groupId&gt; &lt;artifactId&gt;artifactId&lt;/artifactId&gt; &lt;packaging&gt;jar&lt;/packaging&gt; &lt;version&gt;${project.parent.version}&lt;/version&gt; &lt;name&gt;name&lt;/name&gt; </code></pre> <p>Since I started using maven 3.0-alpha-5, I get the following warning for doing so.</p> <pre><code>[WARNING] [WARNING] Some problems were encountered while building the effective model for com.groupid.artifactId:name:jar:1.1-SNAPSHOT [WARNING] 'version' contains an expression but should be a constant. @ com.groupid.artifactId:name::${project.parent.version}, /Users/whaley/path/to/project/child/pom.xml [WARNING] [WARNING] It is highly recommended to fix these problems because they threaten the stability of your build. [WARNING] [WARNING] For this reason, future Maven versions might no longer support building such malformed projects. [WARNING] </code></pre> <p>I'm curious to know what the real problem with tying a module's version to the parent version is, if any? Or is this a case of a general warning when any expression, regardless of whether it's project.parent.version, is used for the version element.</p>
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