How to get JSF2.0 sessionMap reference from a servlet

Question

Below code snippet is what I'm using.

ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();
  Map<String, Object> sessionMap = externalContext.getSessionMap();
  sessionMap.put("User",user);

Now how can I get above "sessionMap" - "key" value from a plain "servlet"? Will the code like this (User)session.getAttribute("User"); work by any chance from my servlet?

If you see my JSF coding, I'm placing it in "session". Then how reading from "request" will work? — MyFist, Feb 24 '13 at 17:12
How can you get FacesContext if your request didn't go through FacesServlet? — skuntsel, Feb 24 '13 at 19:53
Nonetheless you will be able to get HttpSession object from your request, which holds all the attributes you put there before. — skuntsel, Feb 24 '13 at 19:54
possible duplicate of [JSF - get managed bean by name](http://stackoverflow.com/questions/2633112/jsf-get-managed-bean-by-name) — BalusC, Feb 25 '13 at 13:20

score 5 · Accepted Answer · edited May 23 '17 at 12:17

Within a servlet the request / session / application attributes are availbale from within doGet(HttpServletRequest request, HttpServletResponse response) / doPost(HttpServletRequest request, HttpServletResponse response) methods:

//request attributes
String string = (String)request.getAttribute("username");
//session attributes
String string = (String)request.getSession().getAttribute("username");
//application attributes
String string = (String)getServletContext().getAttribute("beanName");

When the request was handled by the FacesServlet, the attributes are available as:

//request attributes
String string = (String)FacesContext.getCurrentInstance().getExternalContext().getRequestMap().get("username");
//session attributes
String string = (String)FacesContext.getCurrentInstance().getExternalContext().getSessionMap().get("username");
//application attributes
String string = (String)FacesContext.getCurrentInstance().getExternalContext().getApplicationMap().get("username");

How to get JSF2.0 sessionMap reference from a servlet

1 Answers1

Suggested reading