title: Free heap size does not increase in Maven
body: <p><br /><br />
  When I run maven-jetty-plugin, I run next command:</p>
  
  <pre><code>mvn -DMAVEN_OPTS="-Xmx1024m -Xms512m" -Djetty.port=8080 jetty:run
  </code></pre>
  
  <p>but when I try to output free heap size with</p>
  
  <pre><code>Long heapFreeSize = Runtime.getRuntime().freeMemory();
  </code></pre>
  
  <p>It always outputs something about about 30000000. <br />
  I suppose it's size in bytes, so about 30 megabytes. <br />
  Why then free heap memory did not increase?</p>