Error trying to save some data to a data base, using an spring manager class from a listening class

[Juan Acv]

Hello everybody.

I'm trying to save some data related to an user in a database when login, using a spring-hibernate manager. I am using a class that implements HttpSessionAttributeListener, to add the data, and to increment a users connected counter:

   
 public void attributeAdded(HttpSessionBindingEvent event) {
        if (event.getName().equals(EVENT_KEY) && !isAnonymous()) {
            SecurityContext securityContext = (SecurityContext) event.getValue();
            if (securityContext.getAuthentication().getPrincipal() instanceof User) {
                User user = (User) securityContext.getAuthentication().getPrincipal();
                log.debug("Creating default data to the user " + user.getId());
                //Inserting the data
                UserData userData = userDataManager.getClientData(user.getId().longValue()); <--- here fails
                //Increment the user counter
                addUsername(user);
            }
        }
    }
 

The method returns an error:

   
java.lang.NullPointerException
        at com.proyecto.webapp.listener.UserCounterListener.attributeAdded(UserCounterListener.java:126)
        at org.mortbay.jetty.servlet.AbstractSessionManager$Session.setAttribute(AbstractSessionManager.java:1077)
        at org.springframework.security.context.HttpSessionContextIntegrationFilter.storeSecurityContextInSession(HttpSessionContextIntegrationFilter.java:392)
...

Even the program never reach the method getClientData() in the UserDataManager (it isn't appear in the log)

What i am doing wrong? May be, it's not possible to access to a spring-hibernate manager from a Listener?

thank you.

[David Newton]

Moving to Spring, as this has nothing to do with Struts.

[Juan Acv]

Thanks

I found an example about what I wanted to do:

http://www.mkyong.com/spring/spring-how-to-do-dependency-injection-in-your-session-listener/

Greetings.