Issue
Basically, I have created all of the pojo and layers(including the repository layer) necessary for Spring Boot to automatically implement MySql commands. When I trying to run the programme, I get the following command: Description:
Parameter 0 of constructor in com.fsse2207.project_backend.api.ProductApi required a bean of type 'com.fsse2207.project_backend.service.ProductService' that could not be found.
Action:
Consider defining a bean of type 'com.fsse2207.project_backend.service.ProductService' in your configuration.
It turns out there's sth wrong about the bean in my ProductApi. It says " Could not autowire. No beans of 'ProductService' type found." How do I fix it?
The following is the interface under the service layer:
package com.fsse2207.project_backend.service;
import com.fsse2207.project_backend.data.ProductCreateData;
import com.fsse2207.project_backend.data.ProductDetailData;
import com.fsse2207.project_backend.exception.ProductFoundByIdException;
import org.springframework.stereotype.Service;
public interface ProductService {
ProductDetailData createProductData (ProductCreateData productCreateData) throws ProductFoundByIdException;
}
The following is the service class:
package com.fsse2207.project_backend.service.impl;
import com.fsse2207.project_backend.data.ProductCreateData;
import com.fsse2207.project_backend.data.ProductDetailData;
import com.fsse2207.project_backend.data.entity.ProductEntity;
import com.fsse2207.project_backend.exception.ProductFoundByIdException;
import com.fsse2207.project_backend.repository.ProductRepository;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class ProductServiceImpl {
private ProductRepository productRepository;
@Autowired
public ProductServiceImpl(ProductRepository productRepository){
this.productRepository=productRepository;
}
public ProductDetailData createProductData (ProductCreateData productCreateData) throws ProductFoundByIdException {
ProductEntity productEntity=new ProductEntity(productCreateData);
if(productRepository.existsById(productEntity.getpId())){
throw new ProductFoundByIdException();
}
return new ProductDetailData(productRepository.save(productEntity));
}
}
The following is the Api:
package com.fsse2207.project_backend.api;
import com.fsse2207.project_backend.data.ProductCreateData;
import com.fsse2207.project_backend.data.ProductDetailData;
import com.fsse2207.project_backend.data.dto.CreateRequestDto;
import com.fsse2207.project_backend.data.dto.CreateResponseDto;
import com.fsse2207.project_backend.exception.ProductFoundByIdException;
import com.fsse2207.project_backend.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class ProductApi {
private ProductService productService;
@Autowired
public ProductApi(ProductService productService){
this.productService=productService;
}
@PostMapping
public CreateResponseDto createResponseDto(@RequestBody CreateRequestDto createRequestDto) throws ProductFoundByIdException {
ProductCreateData productCreateData=new ProductCreateData(createRequestDto);
ProductDetailData productDetailData =productService.createProductData(productCreateData);
return new CreateResponseDto(productDetailData);
}
}
Solution
I found the problem:
I didn't add the implements
keyword in the class definition of ProductServiceImpl
so it was not connected to the bean, aka the interface, aka the service layer.
Answered By - Ben Chu
Answer Checked By - Gilberto Lyons (JavaFixing Admin)