Bug 363400

Description David Minsky 2011-11-09 18:11:04 EST

Found whilst investigating:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=362804
(Need to file a separate bug, as the feature fix needs to be tracked and fixed independently)

Similar to 362804, setMaxResults can be incorrect / fail on subsequent calls, if invoked again on the same query with a different value.

Steps to Reproduce:
1. Create a JPQL Query using EntityManager.createQuery()
2. call setMaxResults(5)
3. execute the query using getResultList().
4. call setMaxResults(Integer.MAX_VALUE)
5. execute the query again using getResultList()

=> maxResults of 5 is still used

Code:

        EntityManager em = createEntityManager();
        clearCache();

        Query query = em.createQuery("SELECT e FROM Employee e");
        assertEquals("Query's maxResults should be Integer.MAX_VALUE", Integer.MAX_VALUE, query.getMaxResults());
        
        List controlList = query.getResultList();
        
        List shortenedResults = query.setMaxResults(5).getResultList();
        assertEquals("Full list should be shorter than the control results list", 5, shortenedResults.size());
        
        query.setMaxResults(Integer.MAX_VALUE);
        assertEquals("Query's max results should have been reset", Integer.MAX_VALUE, query.getMaxResults());
        
        List fullResults = query.getResultList();
        assertEquals("Full list should be the same as the control results list", controlList.size(), fullResults.size());