mySql错误： java.sql.SQLException: Operation not allowed after ResultSet closed

public static int getCheckUsers(List<User> users,String sql)
{
String sqlQuery = "SELECT COUNT(*) " + sql ;
String sqlCol = "SELECT * " + sql ;
int totalRecords = -1;
Connection conn = DB.getConn() ;
Statement stmt = DB.getStatement(conn);  // 一个状态。打开获得查询个数的结果集
ResultSet rsCount = DB.getResultSet(stmt, sqlQuery); // 得到总个数
PreparedStatement pstmtUser = DB.prepare(conn, sqlCol); // 另一个状态，获得符合条件的结果集
ResultSet rs = DB.getResultSet(pstmtUser, sqlCol); // 得到所有用户的集合
try {
rsCount.next();
totalRecords = rsCount.getInt(1);
DB.close(rsCount);
while(rs.next())
{
User u = new User();
u.setId(rs.getInt("id"));
u.setUsername(rs.getString("username"));
u.setPassword(rs.getString("password"));
u.setPhone(rs.getString("phone"));
u.setAddr(rs.getString("addr"));
u.setRdate(rs.getTimestamp("rdate"));
users.add(u);
}
} catch (SQLException e) {
e.printStackTrace();
}finally
{
DB.close(conn);

DB.close(rs);
DB.close(pstmtUser);
}
return totalRecords ;
}