Setting and Getting Attributes from session

//Setting Attribute in session.
String userID="Subin";
HttpSession session = (HttpSession) FacesContext.getCurrentInstance().getExternalContext().getSession(false); session.setAttribute("userId", userID);

//Getting Attribute from the session.
HttpServletRequest hsr = (HttpServletRequest) FacesContext.getCurrentInstance().getExternalContext().getRequest();
String userName = (String) hsr.getSession().getAttribute("userId");

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