web/src/main/java/org/springframework/security/web/csrf/HttpSessionCsrfTokenRepository.java
public CsrfToken loadToken(HttpServletRequest request) {
		HttpSession session = request.getSession(false);
		if (session == null) {
			return null;
		}
		return (CsrfToken) session.getAttribute(this.sessionAttributeName);
	}
public CsrfToken loadToken(HttpServletRequest request) {
		HttpSession session = request.getSession(false);
		if (session == null) {
			return null;
		}
		return (CsrfToken) session.getAttribute(this.sessionAttributeName);
	}
/*
(non-Javadoc)

@see
org.springframework.security.web.csrf.CsrfTokenRepository#loadToken(javax.servlet
.http.HttpServletRequest)