REST API：org.SpringFramework.Beans.Factory.UnsatisfiedDependencyException：

Question

附注：使用mongo DB进行此操作

首先是完全错误

2020-05-04 01:16:31.468  WARN 14412 
--- [           main] ConfigServletWebServerApplicationContext : 
Exception encountered during context initialization - 
cancelling refresh attempt: 
org.springframework.beans.factory.UnsatisfiedDependencyException: 
Error creating bean with name 'productController': 
Unsatisfied dependency expressed through field 'productService'; 
nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException:
 Error creating bean with name 'productServiceImpl':
 Unsatisfied dependency expressed through field 'productRepo'; 
nested exception is org.springframework.beans.factory.BeanCreationException: 
Error creating bean with name 'productRepo': 
Invocation of init method failed; nested exception is org.springframework.data.mapping.PropertyReferenceException:
 No property id found for type Product!

public class Product {

    @Id
    private int ProductId;

// and other variables plus setters and getters 

@Repository
public interface ProductRepo extends MongoRepository<Product, String> {

   // methods
}

public interface ProductService {
 // methods
}

@Service
public class ProductServiceImpl implements ProductService {

    @Autowired
    private ProductRepo productRepo;

// implementations
}

Answer 1

尝试将product类更改为：

@Entity
public class Product {

    @Id
    private String productId; // MongoRepository<Product, String>

    // methods
}

在product类中，缺少@entity批注，并且productID应该是存储库中指定的string。

或者更改为extends mongorepository 。