我正在计算按月分组的SUM

Query q = entityManager.createNativeQuery(qlString);

q.setParameter("program", program);

@SuppressWarnings("unchecked")

List resultList = (List) q.getResultList();

long tend = System.currentTimeMillis();

当我传入两个resultsLists(已关闭：Closed项目的结果列表,closedLate：结果列表项目已关闭)到计算百分比的方法时,我得到

javax.servlet.ServletException: java.lang.ClassCastException: java.math.BigDecimal cannot be cast to java.lang.Long

.

private List computeOTR(List closed, List closedLate) {

List monthlyOTR = new ArrayList();

long numerator;

Long denominator;

for (int i = 0; i <11; i++) {

numerator = closed.get(i) - closedLate.get(i);

denominator = closed.get(i);

long percentage = (int)(numerator * 100.0 / denominator + 0.5);

monthlyOTR.add(i, percentage);

}

return monthlyOTR;

}

在Eclipse中,调试模式关闭显示为BigDecimal.为什么这是我的decalre

列表与LT;长&GT; resultList =(List< Long>)q.getResultList();

EDIT-Hibernate查询：

public List findClosedLateByProgram(String program) {

long tstart = System.currentTimeMillis();

//@formatter:off

String qlString = "with PRJ as ( " +

"select trunc(END_DATE) as END_DATE, " +

"trunc(NEED_DATE) as NEED_DATE " +

"from (SELECT UNIQUE * FROM TEST where PROGRAM_NAME = :program " +

"AND ACTION_BY_ORG = 'AAA') " +

"), " +

"DATES as ( select add_months(trunc(last_day(SYSDATE)), level-7) as thedate " +

"from dual connect by level <= 12 ) " +

"SELECT nvl(sum(case when NEED_DATE < trunc(thedate,'mm') AND END_DATE between trunc(thedate,'mm') and thedate then 1 end), 0 ) as CLOSED_LATE " +

"FROM DATES, PRJ " +

"GROUP BY thedate ORDER BY thedate";

//@formatter:on

Query q = entityManager.createNativeQuery(qlString);

q.setParameter("program", program);

// q.setParameter("today",date, TemporalType.DATE);

@SuppressWarnings("unchecked")

List resultList = q.getResultList();

long tend = System.currentTimeMillis();

long elapsed = tend-tstart;

System.out.println("Elapsed Time For Closed But Late: " + elapsed);

return resultList;

}

编辑2