Hibernate & springframework.security question

[sommeralex]

Hi!

I know that this is more a hibernate than a tapestry question, but i am not
sure if my question is really more hibernate specific, or a standard
problem. 

If i am logged in as User user with session x, but some values of my user
get changed from the outside of a session y my User user in my session x has
still the "old" values. If i am now persisting my User user from session x,
the new values from session y are overwritten and are therefore lost. I am
merging the object via DAO.merge - but it seems that hibernate does not know
which values are old, and new. 

So the question is, what do i have to do, to ensure that my user object
retrieved from my DB is always uptodate?

merge function:

        public T merge(T detachedInstance) {
                logger.debug("Merging " + detachedInstance + ".");
                try {
                        Date now = new Date();
                        detachedInstance.setUpdatedAt(now);
                        T result = 
getHibernateTemplate().merge(detachedInstance);
                        return result;
                } catch (RuntimeException re) {
                        logger.error("Merging " + detachedInstance + " 
failed.", re);
                        throw re;
                }
        }

This is the way i am getting my user object (but this object is never
updated if i am changing some values of the user directly in the DB - only
if i am login out and in again:

UserService.java

        public User getCurrentUser() {
                return authenticationHelper.getPrincipal();
        }

AuthenticationHelper.java

public User getPrincipal() {
    Authentication authentication =
SecurityContextHolder.getContext().getAuthentication();
    User user = null;
    if (authentication != null) { // is user logged in?
    AirwritingUserDetails userDetail = (AirwritingUserDetails)
authentication.getPrincipal();
      user = userDetail.getUser();
    }
    return user;
}

AirwritingUserDetails.java

public abstract class AirwritingUserDetails extends
                org.springframework.security.core.userdetails.User {

        private User user;

        public AirwritingUserDetails(User user, Collection<? extends
GrantedAuthority> authorities) {
                super(user.getUsername(), user.getPassword(), user.getStatus() 
==
Status.ACTIVE, true, true, true,
                                authorities);
                this.user = user;
        }

        public User getUser() {
                return user;
        }

}



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