SessionRepository generics issues

[rwinch]

If you want to use a generic implementation of SessionRepository, it causes issues with saving at the moment. For example, the following will not work:

SessionRepository<? extends Session> repo = ..
Session session = repo.getSession(sessionId);
...
repo.save(session);

If we create a specific repository it cannot be wired using

@Autowired
SessionRepository<Session> repo;

since the generic type is different.