Question

I have openSessionInView filter in web.xml.

<filter>
    <filter-name>openSessionInView</filter-name>
    <filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
</filter>

And I have set allowCreate property of HibernateDaoSupport to true. Now for each database operation if I get the Session by getSession and close the Session after transaction like:

public List<User> getAllUsers() {
    Session session = getSession();
    session.enableFetchProfile("USER-ROLE-PROFILE");
    Transaction transaction = session.beginTransaction();
    DetachedCriteria criteria = DetachedCriteria.forClass(User.class);
    List<User> users = criteria.getExecutableCriteria(session).list();
    transaction.commit();
    session.disableFetchProfile("USER-ROLE-PROFILE");
    session.close();
    return users;
}

then would this Session close create any problem in openSessionInView?

Another question:
Is this a good way to do various hibernate operation? In the above code the entity User has a fetch profile.

Thanks and regards.

Answer 1

if the getAllUsers() is the last thing to do in a request lifecycle, this approach could be acceptable. But if you want to do more database operations, then you have to open a new session, because you have closed it. Moreover, if you don’t close your session, it will be closed by filter:

    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {

...// sf is SessionFactory

            sf.getCurrentSession().beginTransaction();

            // Call the next filter (continue request processing)
            chain.doFilter(request, response);

            sf.getCurrentSession().getTransaction().commit();

...
        }