Sping Data Create a Post method with List

[Eleni Pap]

Hallo everyone,

I am trying to make a new POST to add data at the same time at two tables.

{
       "fname":"Chris",
        "lname":"Ray",
       ("DataClassOne"
       ,"DataClassTwo" )
       "order" : ["grocery_store" ,"apple","1"]
     
}

I would like to fulfil my list from 2 different tables. First , I thought to make a new class DTO with the data I would like to use. Then , I make a List<DTOClass> on my CreateDTO. I did it in this way, because it is possible to have more than one product, or store at one order. But it doesn't work . Any ideas to change it ?

@Component
@Getter
@Setter
public class UserData {   
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id") 
    private Long id;
    private String fname;
    private String lname;

I thought to make a class DTO which have the data

public class Order {


    private Long storeId;
    private String productId;
    private Integer numberOfProducts;


    public StoreProductDTOMini(Store store,Product product, StoreProduct sp) {
        this.shelfId = self.getId();
        this.productId = product.getProductName();
        this.quantity = sp.getQuantity();
    }

public class CreateOrderDTO{


    private Long id;
    private String user;
    private String details;
    List<StoreProduct> spList; //ispecific data  to POST from other classes

    public CreateOrderDTO(CreateOrderDTO orderDTO) {
         .......
        for (StoreProduct s p: orderDTO.get()) {
            StoreProduct storeProdutList = new StoreProductDTO(sp);
            this.spList.add(storeProdutList);
        }

    }

POST Method

    

    public void saveOrder(CreateOrderDTO dto) {
        orderDTO.setUser(dto.getUser());   
        ....
        storeDTO.getDetails(dto.getDetails());  

         ....     
        List<StoreProduct> l = new ArrayList<>();

        for (StoreProduct all : createStoreDTO.getStoreProduct()) {
            StoreProduct dto = new StoreProduct(all);

            l.add(createStoreProductDTO.getStoreProductList());


        }
        orderDTO.setStoreProduct(l);

w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot construct instance of `com.demo..dto.` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('.'); nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `com.demo..dto.` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('.')
at [Source: (PushbackInputStream); line: 7, column: 16] (through reference chain: com.demo..dto.[""]->java.util.ArrayList[0])]

[Himai Minh]

Hi, Eleni,
First of all, I believe your UserData or you can simply define it as User should be annotated with @Entity.

import javax.persistence.*;
import lombok.Data;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;

@Entity
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User{

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id") 
    private Long id;
    private String fname;
    private String lname;

}

First, make sure you have Lombok plugin installed in your IDE such as IntelliJ or Eclipse.
In your pom, add

<dependency>
   <groupId>org.projectlombok</groupId>
   <artifactId>lombok</artifactId>
   <version>1.18.12</version>
</dependency>

[Himai Minh]

Also, if you are interested in Spring data jpa application, you may want to refer to this example :https://www.journaldev.com/17034/spring-data-jpa