title: Http 500 Internal Server Error
body: <p><a href="http://localhost:8080/file.jsp?arg1=&amp;arg2=11" rel="nofollow">http://localhost:8080/file.jsp?arg1=&amp;arg2=11</a></p>
  
  <p>runs successfully</p>
  
  <p><a href="http://localhost:8080/file.jsp?arg1=&amp;arg2=" rel="nofollow">http://localhost:8080/file.jsp?arg1=&amp;arg2=</a></p>
  
  <p>(empty value for argument 'arg2')</p>
  
  <p>shows 500 Internal Server Error</p>
  
  <p>The value of 'arg2' is used by an '<code>int</code>' variable in '<code>jsp</code>' using <code>Integer.parseInt(request.getParameter("arg2")</code></p>
  
  <p>How to fix it?</p>