JdbcTemplate.queryforList（）返回值，但map.get返回null

Question

This is a very strange scenario I have come through and I have not been able to find out why.

This is my code.

public CreditCard getCardByNumber(String creditCardNumber) {
        CreditCard cc = new CreditCard();
        String sql = "Select * from credit_card where card_number=?";
        List<Map<String, Object>> rows = jdbcTemp.queryForList(sql, new Object[] { creditCardNumber });

        for (Map<String, Object> row : rows) {
            for (Entry<String, Object> check : row.entrySet()) {
                System.out.println(check.getKey());
                System.out.println(row.get(check.getKey()));
                System.out.println(check.getValue());
            }
        }
        return cc;
    }

The above code prints following:

card_id
null
1
customer_id
null
1
card_number
null
0699510593447478
cvv
null
231
card_date
null
07/22
card_status
null
Approved
credit_limit
null
8500

When I print the map, it prints {card_id=1, customer_id=1, card_number=0699510593447478, cvv=231, card_date=07/22, card_status=Approved, credit_limit=8500}

I tried row.get(key) which always returns null, I don't know why, but when I use entrySet to print the value, it gets the value.

Answer 1

This happened because I used different Spring JDBC version and Spring version. Just changed Spring JDBC to Spring version and it worked like a charm.