title: "Attempted to set property value on a null object"
body: <p>I have written a wicket application to filter records based on given input. I get the error as </p>
  
  <blockquote>
    <p>Attempted to set property value on a null object. Property expression: code Value: ad</p>
  </blockquote>
  
  <p>where, 
  Code is the name of the field &amp; ad is value entered to filter on.</p>