How to get SavedRequest in Spring Security 3 in login.jsp?

How to get SavedRequest in Spring Security 3 in login.jsp ? I found an example :

<%@page import="org.springframework.security.web.savedreq开发者_如何转开发uest.SavedRequest"%>
<%

SavedRequest savedRequest = (SavedRequest) session.getAttribute(AbstractProcessingFilter.SPRING_SECURITY_SAVED_REQUEST_KEY);

.... %>

But this doesn't work in SpringSecurity 3.

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you should use DefaultSavedRequest.SPRING_SECURITY_SAVED_REQUEST_KEY as the key