how to access faces context and backing beans in a servlet filter

[Vincent Zhao]

Is there a way to get hold of a managed bean with session scope in a servlet filter? The code below throws an error due to the fact that the faces context is null.

FacesContext facesContext = FacesContext.getCurrentInstance();
System.out.println("facesContext: " + facesContext); // shows that facesContext is null
ApplicationFactory appFactory = ApplicationFactory)FactoryFinder.getFactory(FactoryFinder.APPLICATION_FACTORY);
Application app = appFactory.getApplication();
Object obj = app.createValueBinding("user").getValue(facesContext); //throws the error due to the null parameter
Object obj2 = app.createValueBinding("user"); //results in a valid ValueBinding
    

[Vincent Zhao]

This thread help me out:
http://wiki.apache.org/myfaces/AccessFacesContextFromServlet AccessFacesContextFromServlet

[Vincent Zhao]

This post help me a lot.
webpage

[Vincent Zhao]

Now, I can access backing beans in a servlet filter. But after I populate value to this backing bean, it didn't keep in session scope for future. How can I do next?

[Vincent Zhao]

Yes, there is a way to get hold of a managed bean with session scope in a servlet filter.
See here:
AccessFacesContextFromServlet

and here:
how to access faces context and backing beans in a servlet filter


After I get User bean in my Servlet filter, I populate value to this bean, for example:
user.setLanguage(request.getParameter("locale"));
The User bean is in session scope. The User bean's language attribute suppose to be same in the whole session scope, but later on, I got null. My question is:
how to keep this value in session scope?