title: Appending JVM parameter to the parameter specified explicitly in plugin configuration?
body: <p>Sometimes I need the parameter to be appended, instead of overriding the one in configuration:</p>
  
  <p>for instance    </p>
  
  <pre><code>mvn test  -DargLine="-Dportal.test=huge"    
  </code></pre>
  
  <p>should be added to </p>
  
  <pre><code>&lt;argLine&gt;-XX:+CMSClassUnloadingEnabled&lt;/argLine&gt;
  </code></pre>
  
  <p>so the result would equal to  </p>
  
  <pre><code>&lt;argLine&gt;-XX:+CMSClassUnloadingEnabled -Dportal.test=huge&lt;/argLine&gt;
  </code></pre>
  
  <p>Could please anybody tell me if it is possible and how ?</p>
  
  <p>EDIT: Please don't answer with " Why would you want to do that" kind of annoying questions.</p>