Spring JPA native query with Projection gives “ConverterNotFoundException”

Question

I\'m using Spring JPA and I need to have a native query. With that query, I need to get only two fields from the table, so I\'m trying to use Projections. It isn\'t working

Answer 1

You can return list of Object Array (List) as return type of the native query method in repository class.

@Query(
            value = "SELECT [type],sum([cost]),[currency] FROM [CostDetails] " +
                    "where product_id = ? group by [type],[currency] ",
            nativeQuery = true
    )
    public List getCostDetailsByProduct(Long productId);

for(Object[] obj : objectList){
     String type = (String) obj[0];
     Double cost = (Double) obj[1];
     String currency = (String) obj[2];
     }