UserContext userContext = user.getInitialUserContext(sessionId);
userContext = user.getInitialUserContext(sessionId);
	public synchronized UserContext login(String userName, String password) {		UserManager userManager = UserManager.getInstance();		User user = userManager.getUser(userName);		if ((user != null) && (password.equals(user.getPassword()))) {			String sessionId = IdManager.nextId(userName);			UserContext userContext = user.getInitialUserContext(sessionId);			sessions.put(userName, userContext);			return userContext;		}		return null;	}