SPRING_SECURITY session key

Change the ACEGI_SECURITY_CONTEXT session key to SPRING_SECURITY_CONTEXT
Change the ACEGI_SECURITY_LAST_USERNAME session key to SPRING_SECURITY_LAST_USERNAME

Change the following taglib definition:
<%@ taglib prefix="authz" uri="http://acegisecurity.org/authz"%>
to:
<%@ taglib prefix="security" uri="http://www.springframework.org/security/tags" %>

Change JSP auth:authorize tag references to security:authorize.

Change any "auth:authentication operation='xxxx'" tag references to "security:authentication property='principal.xxxx'"