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    copied!<p>To elaborate on edbrannin's alternate solution:</p> <pre><code>&lt;project&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;groupId&gt;com.yourcompany&lt;/groupId&gt; &lt;artifactId&gt;yourproject&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;build&gt; &lt;plugins&gt; &lt;plugin&gt; &lt;artifactId&gt;maven-antrun-plugin&lt;/artifactId&gt; &lt;executions&gt; &lt;execution&gt; &lt;id&gt;checkParam&lt;/id&gt; &lt;phase&gt;initialize&lt;/phase&gt; &lt;goals&gt;&lt;goal&gt;run&lt;/goal&gt;&lt;/goals&gt; &lt;configuration&gt; &lt;tasks&gt; &lt;fail message="'env' property must be set" unless="env"/&gt; &lt;/tasks&gt; &lt;/configuration&gt; &lt;/execution&gt; &lt;/executions&gt; &lt;/plugin&gt; &lt;/plugins&gt; &lt;/build&gt; &lt;/project&gt; </code></pre> <p>will give you the following output:</p> <pre><code>[INFO] ------------------------------------------------------------------------ [ERROR] BUILD ERROR [INFO] ------------------------------------------------------------------------ [INFO] An Ant BuildException has occured: 'env' property must be set </code></pre> <p>IMHO the most straightforward way to do it (the one I'd go for personally).</p> <p>You could even control a set of allowed values using a nested <code>&lt;condition&gt;</code> containing <code>&lt;or&gt;</code> and <code>&lt;equals&gt;</code> tags (see the Ant manual: <a href="http://ant.apache.org/manual/Tasks/conditions.html" rel="nofollow noreferrer">http://ant.apache.org/manual/Tasks/conditions.html</a>)</p>
 

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