title: How to validate that a value is entered in at least one of the <h:inputText> components?
body: <p>In my JSF application I have two <code>&lt;h:inputText&gt;</code> components. I need to make sure that value is entered in <em>at least one</em> of them. How can I implement such a validator?</p>
  
  <p>I am aware that I can use JavaScript for this, but I'd prefer to do the checks in the server side.</p>