Type safety: Unchecked cast from List to List<String>

Question

I have this method where I cast the results to (List ) , but my eclipse is still complaining ! Type safety: Unchecked cast from List to List

@Override
public List<String> getDevices(Long productId) {

        String queryString = "SELECT op.name FROM t_operation op WHERE op.discriminator = 'ANDROID' and PRODUCT =:productId ";

        try {
            Query query = getEntityManager().createQuery(queryString);
            query.setParameter("productId", productId);

            return (List<String> ) query.getResultList();


        } catch (RuntimeException re) {         
            throw re;
        }

    }

Answer 1

You can sure use TypedQuery with the parameter types is String in this case. So what you need is

TypedQuery<String> query = getEntityManager().createQuery(queryString, String.class);