Spring 3.1 @Cacheable - method still executed

Question

I\'m trying to implement Spring 3.1 caching as explained here and here, but it doesn\'t seem to be working: my method is run through every time even though it is marked @cacheab

Answer 1

In addition to Lee Chee Kiam: Here is my solution for small projects with only marginal usage of bypassing (not annotated) method calls. The DAO is simply injected into itself as a proxy and calls it's own methods using that proxy instead of a simple method call. So @Cacheable is considered without doing complicated insturmentation.

In-code documentation is strongly advidsed, as it may look strange to colleagues. But its easy to test, simple, quick to achieve and spares me the full blown AspectJ instrumentation. However, for more heavy usage I'd also advice the AspectJ solution as Lee Chee Kiam did.

@Service
@Scope(proxyMode = ScopedProxyMode.TARGET_CLASS)
class PersonDao {

    private final PersonDao _personDao;

    @Autowired
    public PersonDao(PersonDao personDao) {
        _personDao = personDao;
    }

    @Cacheable(value = "defaultCache", key = "#id")
    public Person findPerson(int id) {
        return getSession().getPerson(id);
    }

    public List findPersons(int[] ids) {
        List list = new ArrayList();
        for (int id : ids) {
            list.add(_personDao.findPerson(id));
        }
        return list;
    }
}