title: what is contextLoaderListerner in spring mvc
body: <p>I have seen this code in web.xml file</p>
  
  <pre><code>&lt;listener&gt;
  &lt;listener-class&gt;org.springframework.web.context.ContextLoaderListener&lt;/listener-class&gt;
  &lt;/listener&gt;
  </code></pre>
  
  <p>I build small sample app but i didn't used that before. whats the need of this</p>