LazyInitializationException using HibernateDaoSupport

I'm trying to use HibernateDaoSupport but I'm getting stuck with a org.hibernate.LazyInitializationException problem.

This is an example of what I want to do;

public class MyDaoImpl extends HibernateDaoSupport {

    public Set<Long> getCoreItemIdsForCustomerIds(Set<Long> customerIds) {
        Set<Long> itemIds = new HashSet<Long>();
        for (Long customerId : customerIds) {
            Customer customer = getCustomerWithId(customerId);
            itemIds.addAll(getItemIdsFromItems(customer.getCoreItems()));
        }
        return itemIds;
    }

    private Customer getCustomerWithId(Long customerId) {
        return getHibernateTemplate().get(Customer.class, customerId);
    }

    private Set<Long> getItemIdsFromItems(Set<Item> items) {
        Set<Long> itemIds = new HashSet<Long>();
        for (Item item : items) {
            itemIds.add(item.getId());
        }
        return itemIds;
    }
}

A Customer has a collection 开发者_Python百科of Items. The entity is Fetched lazily, so I guess the problem is after getCustomerWithId completes the session is closed, and 'customer' is now detached. So when customer.getCoreItems() is invoked the exception is thrown.

Does any one know how I can use HibernateDaoSupport and keep the session open until getCoreItemIdsForCustomerIds returns?

Or do I need to start and close the transaction manually myself to do this?

Hope that has made sense! Thanks.

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Use the OpenSessionInView filter. The session will be open for the duration of the request-response render phase.