Criteria query cache caching in Eclipselink?

Question

Iam using criteria queries with EclipseLink as JPA . I need to cache the query results based on their parameters . When I used query.setHint("eclipselink.QUERY_RESULTS_CACHE", "TRUE") it still fires query to the database. How can I use it in context of criteria queries ?

Here I set my query and their hints and addNamedQuery

Query query = psEntityManager.getEntityManager().createQuery(criteriaQuery);// Creating Query to supply Values
        query.setHint("eclipselink.QUERY_RESULTS_CACHE", "TRUE");
        query.setHint(QueryHints.QUERY_TYPE,QueryType.ReadObject);
        psEntityManager.getEntityManager().getEntityManagerFactory().addNamedQuery("query1", query);

Here is my output :

Query1-----------
[EL Fine]: sql: 2013-10-10 21:33:35.495--ServerSession(14144548)--Connection(7200601)--SELECT PRIMARYKEY, ADDRESSLINE1, ADDRESSLINE2, PHONENUMBER, fkCityId, fkPersonId FROM ADDRESS WHERE (fkPersonId = ?)
    bind => [2]
[EL Fine]: sql: 2013-10-10 21:33:35.527--ServerSession(14144548)--Connection(7200601)--SELECT PRIMARYKEY, CITYNAME, PINCODE, fkStateId FROM CITY WHERE (PRIMARYKEY = ?)
    bind => [2]
[EL Fine]: sql: 2013-10-10 21:33:35.528--ServerSession(14144548)--Connection(7200601)--SELECT PRIMARYKEY, STATENAME FROM STATE WHERE (PRIMARYKEY = ?)
    bind => [1]
[EL Fine]: sql: 2013-10-10 21:33:35.531--ServerSession(14144548)--Connection(7200601)--SELECT PRIMARYKEY, AGE, DOB, FIRSTNAME, LASTNAME, SEX, TIMESTAMP, fkDepartmentId FROM PERSON WHERE (PRIMARYKEY = ?)
    bind => [2]
[EL Fine]: sql: 2013-10-10 21:33:35.541--ServerSession(14144548)--Connection(7200601)--SELECT PRIMARYKEY, DEPTNAME FROM DEPARTMENT WHERE (PRIMARYKEY = ?)
    bind => [2]
[EL Fine]: sql: 2013-10-10 21:33:35.547--ServerSession(14144548)--Connection(7200601)--SELECT PRIMARYKEY, CITYNAME, PINCODE, fkStateId FROM CITY WHERE (PRIMARYKEY = ?)
    bind => [5]
[EL Fine]: sql: 2013-10-10 21:33:35.548--ServerSession(14144548)--Connection(7200601)--SELECT PRIMARYKEY, STATENAME FROM STATE WHERE (PRIMARYKEY = ?)
    bind => [3]
[EL Fine]: sql: 2013-10-10 21:33:35.551--ServerSession(14144548)--Connection(7200601)--SELECT PRIMARYKEY, CITYNAME, PINCODE, fkStateId FROM CITY WHERE (PRIMARYKEY = ?)
    bind => [8]
[EL Fine]: sql: 2013-10-10 21:33:35.553--ServerSession(14144548)--Connection(7200601)--SELECT PRIMARYKEY, STATENAME FROM STATE WHERE (PRIMARYKEY = ?)
    bind => [4]
Query2-----------
[EL Fine]: sql: 2013-10-10 21:33:35.557--ServerSession(14144548)--Connection(7200601)--SELECT PRIMARYKEY, ADDRESSLINE1, ADDRESSLINE2, PHONENUMBER, fkCityId, fkPersonId FROM ADDRESS WHERE (fkPersonId = ?)
    bind => [2]
Query3-----------
[EL Fine]: sql: 2013-10-10 21:33:35.56--ServerSession(14144548)--Connection(7200601)--SELECT PRIMARYKEY, ADDRESSLINE1, ADDRESSLINE2, PHONENUMBER, fkCityId, fkPersonId FROM ADDRESS WHERE (fkPersonId = ?)
    bind => [2]
Query4-----------
[EL Fine]: sql: 2013-10-10 21:33:35.563--ServerSession(14144548)--Connection(7200601)--SELECT PRIMARYKEY, ADDRESSLINE1, ADDRESSLINE2, PHONENUMBER, fkCityId, fkPersonId FROM ADDRESS WHERE (fkPersonId = ?)
    bind => [2]

Answer 1

Remove the query.setHint(QueryHints.QUERY_TYPE,QueryType.ReadObject), or call it first. The query_type changes the underlying query object, and not all the hints might be copied into the new object. It seems unnecessary anyway.