When developing your JSF web application, be sure to avoid any casts to HttpServletRequest, HttpServletResponse, etc. Instead, use the methods on ExternalContext(). For example:
FacesContext facesContext = FacesContext.getCurrentInstance();
ExternalContext externalContext = facesContext.getExternalContext();
// Incompatible with portlets
HttpServletRequest request = (HttpServletRequest) externalContext.getRequest();
String attributeValue = (String) request.getAttribute("foo");
String parameterValue = request.getParameter("bar");
// Compatibile with both webapps and portlets:
String attributeValue = (String) externalContext.getRequestMap().get("foo");
String parameterVale = externalContext.getRequestParameterMap().get("bar");
By following this type of approach, you will increase your chances that your JSF web application will be deployable as a portlet during your integration phase.
