title: how to remove the warning The serializable class ClASSNAME does not declare a static final serialVersionUID field of type long
body: <p>I create a class which extends <code>Exception</code> class, I got this warning on Eclipse </p>
  
  <blockquote>
    <p>The serializable class PhoneAlreadyExists does not declare a static
    final serialVersionUID field of type long</p>
  </blockquote>
  
  <p>how to remove it please ?</p>
  
  <pre><code>public class PhoneAlreadyExists extends Exception {
      public PhoneAlreadyExists() {
          // TODO Auto-generated constructor stub
          super();
      }
  
      PhoneAlreadyExists(String message) {
          super(message);
      }
  
  }
  </code></pre>