mysql批量删除时出现java.sql.SQLException: Operation not allowed after ResultSet closed

使用java批量删除数据时，出现了java.sql.SQLException: Operation not allowed after ResultSet closed异常，具体的异常信息如下：

代码信息如下：

/**
 * 删除指定时间点之前的所有数据
 * @param endTime 时间点
 * @throws Exception
 */
public static void removeOldEma(String endTime) throws Exception{
    Class.forName("com.mysql.jdbc.Driver");
    Connection conn = DriverManager.getConnection(URL, USERNAME, PASSWORD);
    Statement stmt = conn.createStatement();
    // 因为使用数据库，对批量操作有事务的条数要求，因为需要先查询目标删除数量，再进行批量删除
    String countSql = "SELECT COUNT(*) AS sumNumber FROM tableName WHERE AcquisitionTime < '" + endTime + "'";
    String sql = "DELETE FROM tableName WHERE AcquisitionTime < '" + endTime + "' LIMIT 10000";
    try {
        ResultSet resultSet = stmt.executeQuery(countSql);
        while (resultSet.next()) {
            try {
                int number = resultSet.getInt("sumNumber");
                int count = number / 10000;
                if (number < 10000 || 0 != count){
                    for (int i = 0 ;i <= count; i++){
                        stmt.executeUpdate(sql);
                    }
                }
            }catch (Exception e){
                logger.error("未查询到数据: SQL：" + sql);
            }
        }
    }catch (Exception e){
        logger.error("Exception when removeOldEma: ", e);
    }finally {
        stmt.close();
        conn.close();
    }
}

跟踪代码发现，在最后一次数据删除后，resultSet被关闭，while循环体中判断resultSet时就会出现异常。于是将while循环的条件修改为 while (!resultSet.isClosed() && resultSet.next())后问题解决。