title: Maven generating two jar files when used with "classifier" tag
body: <p>My project requires me to take open source code, tune it and use it as a dependency. When I build it, I want to append a classifier with it (so as to distinguish between modified and original code). Following is snippet form pom.xml.</p>
  
  <p></p>
  
  <pre><code>&lt;plugins&gt;
      &lt;plugin&gt;
          &lt;artifactId&gt;maven-jar-plugin&lt;/artifactId&gt;
          &lt;executions&gt;
              &lt;execution&gt;
                  &lt;id&gt;gc-custom&lt;/id&gt;
                  &lt;goals&gt;
                      &lt;goal&gt;jar&lt;/goal&gt;
                  &lt;/goals&gt;
  
                  &lt;configuration&gt;
                      &lt;classifier&gt;gc&lt;/classifier&gt;
                  &lt;/configuration&gt;
              &lt;/execution&gt;
          &lt;/executions&gt;
      &lt;/plugin&gt;
  &lt;/plugins&gt;  
  </code></pre>
  
  <p></p>
  
  <p>My issue is that after I fire build, maven is generating both jar files (with and without classifier attached) i.e. output contains 2 jar files named "atlassian-pageobjects-api-2.1-m14.jar", "atlassian-pageobjects-api-2.1-m14-gc.jar".</p>
  
  <p>I am using following command to build:</p>
  
  <p>mvn clean install</p>
  
  <p>Please help and let me know what is wrong here.</p>