title: jsf2 pass request parameter commandButton
body: <p>I am using JSF2. I have a <code>commandButton</code> on whose action I am performing a navigation. The method I am calling on action returns a string where I am doing a redirect like this :</p>
  
  <pre><code>return "/orders/createOrder.xhtml?faces-redirect=true";
  </code></pre>
  
  <p>My requirement is that I need to pass an additional parameter. But when I am returning like this, it does not redirect:</p>
  
  <pre><code>return "/orders/createOrder.xhtml?faces-redirect=true?another_Param=valueOfParam";
  </code></pre>
  
  <p>I am using this param for some other processing.</p>
  
  <p>How can i pass this additional parameter using returning a string which is used in action of commandButton?</p>