How to handle Navigation in Managed Bean? - jsf-2

Question

I have a JSF 2.1 with Primefaces mobile project which should run on desktop and mobile platforms. I wrote a renderkit handler which provides required renderkit based on the device the web app is running on. I'm having tough time in redirecting a desktop page to a mobile page.
URL used to access : http://localhost:8080
My Application structure is :
root
- WebContent
--desktop
---login.xhtml
--mobile
---login.xhtml
--WEB-INF
---web.xml
---faces-config.xml
--META-INF
faces-config.xml
<application>
<view-handler>com.renderkit.CustomViewHandler</view-handler>
</application>
<navigation-rule>
<display-name>Desktop-Login</display-name>
<from-view-id>/desktop/login.xhtml</from-view-id>
<navigation-case>
<from-outcome>MOBILE</from-outcome>
<to-view-id>/mobile/login.xhtml</to-view-id>
</navigation-case>
</navigation-rule>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>AnalyzerUI</display-name>
<welcome-file-list>
<welcome-file>/desktop/login.xhtml</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
<url-pattern>*.jsf</url-pattern>
<url-pattern>*.faces</url-pattern>
<url-pattern>*.xhtml</url-pattern>
</servlet-mapping>
<context-param>
<description>State saving method: 'client' or 'server' (=default). See JSF Specification 2.5.2</description>
<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
<param-value>client</param-value>
</context-param>
<context-param>
<param-name>javax.servlet.jsp.jstl.fmt.localizationContext</param-name>
<param-value>resources.application</param-value>
</context-param>
<context-param>
<param-name>com.sun.faces.expressionFactory</param-name>
<param-value>com.sun.el.ExpressionFactoryImpl</param-value>
</context-param>
<context-param>
<param-name>javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL</param-name>
<param-value>true</param-value>
</context-param>
<context-param>
<param-name>javax.faces.DATETIMECONVERTER_DEFAULT_TIMEZONE_IS_SYSTEM_TIMEZONE</param-name>
<param-value>true</param-value>
</context-param>
<listener>
<listener-class>com.sun.faces.config.ConfigureListener</listener-class>
</listener>
</web-app>
User class, a Session scoped Managed Bean class for login.xhtml
#ManagedBean
#SessionScoped
public class User implements Serializable
{
private String name;
private String password;
#PostConstruct
public void myPostConstruct()
{
String renderKitId = FacesContext.getCurrentInstance().getViewRoot().getRenderKitId();
System.out.println(" renderKitId >>> " + renderKitId);
if (renderKitId.equalsIgnoreCase("PRIMEFACES_MOBILE"))
{
try
{
FacesContext.getCurrentInstance().getApplication(). getNavigationHandler().handleNavigation(FacesContext.getCurrentInstance(), null , "MOBILE");
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
//getters and setters
}
CustomViewHandler
public class CustomViewHandler extends ViewHandlerWrapper
{
private ViewHandler wrapped;
public CustomViewHandler(ViewHandler wrapped)
{
this.wrapped = wrapped;
}
#Override
public ViewHandler getWrapped()
{
return this.wrapped;
}
#Override
public String calculateRenderKitId(FacesContext context)
{
HttpServletRequest req = (HttpServletRequest) context.getExternalContext().getRequest();
String userAgent = req.getHeader("user-agent");
String accept = req.getHeader("Accept");
System.out.println("userAgent ::: "+ userAgent+ " accept :: "+accept);
if (userAgent != null && accept != null) {
UAgentInfo agent = new UAgentInfo(userAgent, accept);
if (agent.isMobileDevice()) {
return "PRIMEFACES_MOBILE";
}
}
return this.wrapped.calculateRenderKitId(context);
}
}