Confusion over Native Query Result List

Question

I have this confusion over the field object of a resultList of a Native query. This is because it has contradicted the idea of the books for me.
This is a pure example
@SqlResultSetMapping(name="LoanCapitalization.reportMapping",
columns={
    @ColumnResult(name="policy_number"),
    @ColumnResult(name="policy_holder"),
    @ColumnResult(name="amount"),
    @ColumnResult(name="outstanding_loan"),
    @ColumnResult(name="interest"),
    @ColumnResult(name="amount_to_date"),
    @ColumnResult(name="effective_date"),
    @ColumnResult(name="sub_system_code")
@NamedNativeQuery(name="LoanCapitalization.aggregateStatement", query="SELECT   l.policy_number, l.last_name || ' ' || l.first_name as " +
        "policy_holder, l.amount, c.out_principal_bf as outstanding_loan, c.out_interest_bf as interest, " +
        "SUM (r.repayment_amount) as amount_to_date, c.effective_date, l.sub_system_code FROM loan l JOIN v_latest_capitalization c " +
        "ON l.loan_id = c.loan_id JOIN loan_repayment r ON l.loan_id = r.loan_id WHERE " +
        "c.effective_date BETWEEN ?1 AND ?2 GROUP BY l.policy_number, l.last_name, l.first_name, l.amount, " +
        "c.out_principal_bf, c.out_interest_bf, c.effective_date, l.sub_system_code order by l.sub_system_code, l.last_name",
        resultSetMapping="LoanCapitalization.reportMapping")and
Query query = entityManager.createNamedQuery("LoanCapitalization.aggregateStatement");
        AggregateStatementLoanBalanceReportData data = null;
        List<AggregateStatementLoanBalanceReportData> returnList = new ArrayList<AggregateStatementLoanBalanceReportData>();
        query.setParameter(1, reportCriteria.getFromDate());
        query.setParameter(2, reportCriteria.getToDate());
        List<Object[]> resultList = query.getResultList();
        System.out.println("resultList.size() >>>>>>>>>> " + resultList.size());
        for (Object[] obj : resultList){
            data = new AggregateStatementLoanBalanceReportData();
            System.out.println("(String)obj[1] >>>>>>>>>> " + (String)obj[1]);
            System.out.println("(String)obj[2] >>>>>>>>>> " + (String)obj[2]);
            System.out.println("(String)obj[3] >>>>>>>>>> " + (String)obj[3]);
            System.out.println("(String)obj[4] >>>>>>>>>> " + (String)obj[4]);
            System.out.println("(String)obj[5] >>>>>>>>>> " + (String)obj[5]);
            System.out.println("(String)obj[6] >>>>>>>>>> " + (String)obj[6]);
            data.setPolicyNumber((String)obj[0]);
            data.setName((String)obj[1]);
.......My first shocking surpise is that all the System.out.println() return nulls but
System.out.println("resultList.size() >>>>>>>>>> " + resultList.size()); returned 1.
so can anyone suggest what the problem may be.
Regards,
Michael

Answer 1

I came across your post as I experienced the same problem. As I found no answers I tried different let's say stupid solutions.
The one that solved my problem was to write the name for the @ColumnResult in capitals as I noticed that Oracle transforms the alias column names into capitals. I guess otherwise the mapping doesn't occur correctly.
My example:
@SqlResultSetMappings({
@SqlResultSetMapping(
name = "Customers.searchCustomers",
entities =
@EntityResult(entityClass = Customers.class)
columns =
@ColumnResult(name = "CONTACTDATE"),
@ColumnResult(name = "CONTRACTDATE")
String queryString =
"SELECT c.CUSTOMER_ID, c.LAST_NAME, c.FIRST_NAME, c.OPU, c.CUSTOMER_CORE_ID, " +
"to_char(con.CONTACT_DATE, 'yyyy-dd-mm') AS CONTACTDATE, to_char(contr.CONTRACT_DATE, 'yyyy-dd-mm') AS CONTRACTDATE " +
"FROM CUSTOMERS c " +
"LEFT JOIN CONTACTS con ON con.CUSTOMER_ID = c.CUSTOMER_ID AND con.ACTIVE = '1' " +
"LEFT JOIN CONTRACTS contr ON contr.CUSTOMER_ID = c.CUSTOMER_ID AND contr.ACTIVE = '1' " +
"WHERE c.CAMPAIGN_ID = ?1 AND upper(c.LAST_NAME) LIKE ?2 AND upper(c.FIRST_NAME) LIKE ?3";
query = em.createNativeQuery(queryString,
"Customers.searchCustomers");