java - 空指针异常 Calendar.setTime

Question

  Calendar lastEditDate = Calendar.getInstance();
                        lastEditDate.setTime(rs.getDate("LAST_EDIT_DATE"));
                        productGroup.setLastEditDate(lastEditDate);

我有一个 NullPointerException:

[ERROR] [16.08.2013 11:30:43] [ DatabaseWorker] = [admin][Get product groups]
java.lang.NullPointerException
at java.util.Calendar.setTime(Calendar.java:1106)
at ro.gs.service.catering.dao.ProductGroupDAO$3.doWork(ProductGroupDAO.java:220)

有人可以告诉我为什么会出现这个异常吗？

Answer 1

getDate(String columnLabel)返回

the column value; if the value is SQL NULL, the value returned is null

您的表允许此列中出现空值吗？