How to map the POJO with the database ResultSet if the columnNames and fieldNames is different using java Reflection?

I am working in dynamically mapping the values from Result Set to POJO using Java reflection. It is working, but if the column name is different from the field in pojo it is not getting mapped.

For ex: if my column name is ORD_ID and in my pojo it is orderId, the ord_id is not getting mapped with order id. Here is the logic i'm using below.Kindly suggest a solution or an idea. Thanks is advance !

    int colCount = resultSet.getMetaData().getColumnCount();
    for (int i = 0; i < colCount; i++) 
    {
    columnNames.put(resultSet.getMetaData().getColumnName(i + 1).toLowerCase(), i);
    }
    List<T> results = new ArrayList<>();
    while(resultSet.next())
    {
        T newObj = clazz.newInstance();
        for (Field field : clazz.getDeclaredFields()) 
        {
            String fieldName = field.getName().toLowerCase();
            if (columnNames.containsKey(fieldName)) 
            {
                final int index = columnNames.get(fieldName);
                field.setAccessible(true); 
                field.set(newObj, resultSet.getObject(index+1));
            }
        }
        results.add(newObj);
    }