title: Extracting XML Elements from Java Object
body: <p>How can i extract an xml element from a java object. for example i have an object of java.lang.Object that contain xml file content at below:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;custom:a ...&gt;
   &lt;custom:b...&gt;
     .....
   &lt;/custom:b&gt;
  &lt;/custom:a&gt;
  </code></pre>
  
  <p>i want to extract <code>&lt;custom:b..&gt;</code> element. please guide me!</p>