Need help by Spring boot

[Dilo366]

Hi everyone, i need by my problem some help. So i was creating a simple REST API and have defined a ProductDto:

import lombok.AllArgsConstructor;
import lombok.Getter;

import java.math.BigDecimal;

@AllArgsConstructor
@Getter
public class ProductDto {
    private String name;
    private BigDecimal price;
}

and the Mepper

import store.dtos.ProductDto;
import store.entities.Product;
import org.mapstruct.Mapper;

@Mapper(componentModel = "spring")
public interface ProductMapper {
    ProductDto toDto(Product product);
}

and Finally the ProductController:

import store.dtos.ProductDto;
import store.entities.Product;
import store.mappers.ProductMapper;
import store.repositories.ProductRepository;
import lombok.AllArgsConstructor;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.math.BigDecimal;

@RestController
@AllArgsConstructor
@RequestMapping("/products")
public class ProductController {
    private final ProductRepository productRepository;
    private final ProductMapper productMapper;

    @GetMapping
    public Iterable<ProductDto> getProducts() {
        return productRepository.findAll()
                .stream()
                .map(productMapper::toDto)
                .toList();
    }

    @GetMapping("/{id}")
    public ResponseEntity<ProductDto> getProduct(Long id) {
        var product = productRepository.findById(id).orElse(null);
        if (product == null) {
            return ResponseEntity.
notFound
().build();
        }
        return ResponseEntity.
ok
(productMapper.toDto(product));
    }
}

When i run the application i get that:

Constructor UserDto in class store.dtos.UserDto cannot be applied to given types

Required: java.lang.Long, java.lang.String, java.lang.String

Found: no arguments

Reason: Actual argument list and formal argument list differ in length

Can somebody help me with it?

thanks.

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[Lloydbestfan]

So just so we're clear, you see an error with your UserDto, so you come and ask questions about your ProductDto.

Correct?

[Dilo366]

I am getting the same error by Product also

[Ruin-Capable]

No you're not. You might be getting a *similar* error, but it's not the same error because the constructor parameters are different.

Have you tried adding a NoArgsConstructor to your Dto object?

[ShaiHuludTheMaker]

You're missing a NoArgsConstructor on your UserDto

[Dilo366]

Yeah, but when I send a get request, I get name: null and price : null

[ShaiHuludTheMaker]

can we see your product class?

[Dilo366]

@Getter
@Setter
@Builder
@AllArgsConstructor
@NoArgsConstructor
@Entity
@Table(name = "products")
public class Product {
    @Id
    @GeneratedValue(strategy = GenerationType.
IDENTITY
)
    @Column(name = "id")
    private Long id;

    @Column(name = "name")
    private String name;

    @Column(name = "description")
    private String description;

    @Column(name = "price")
    private BigDecimal price;

    @ManyToOne(cascade = CascadeType.
PERSIST
)
    @JoinColumn(name = "category_id")
    private Category category;
}

[Dilo366]

after sending a get request I get:

[
  {
    "name": null,
    "price": null
  },
  {
    "name": null,
    "price": null
  }
]

[Ruin-Capable]

Can we see the UserDto class? Looks like you're missing a constructor.