title: Not able to make @webparam mandatory field JAX-WS
body: <p>I am trying to make my <code>@webparam</code> mandatory using <code>(@XmlElement(required=true)</code> but the generated XSD still shows this as <code>minOccurs="0"</code>. Also tried setting <code>nillable=false</code> but still not working.</p>
  
  <p>Here is my web method :</p>
  
  <pre><code>@WebMethod
  @WebResult(name = "Biller")
  public Biller getBiller(@XmlElement(required=true) @WebParam(name = "billerId") Integer billerId){}
  </code></pre>
  
  <p>Please suggest.</p>