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春季启动 2.2.5

一个购物车有很多产品。我需要存储产品和产品数量。所以我为此使用地图。所以这里是我的模型：

import javax.persistence.*;
import java.util.*;
import org.springframework.data.util.Pair;

@Entity
public class Cart {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int id;
       @OneToMany(mappedBy = "cart", fetch = FetchType.EAGER,
            cascade = CascadeType.ALL)
    private Map<Product, Integer> products;

}

@Entity
public class Product {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int id;
    @ManyToOne(fetch = FetchType.EAGER, optional = false)
    @JoinColumn(name = "cart_id", nullable = false)
    private Cart cart;

}

public interface CartRepository extends CrudRepository<Cart, Integer> {

}

但是当我尝试启动应用程序时出现错误：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcConversionService' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.format.support.FormattingConversionService]: Factory method 'mvcConversionService' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'ordersRepository' defined in com.myproject.repo.OrdersRepository defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Cannot resolve reference to bean 'jpaMappingContext' while setting bean property 'mappingContext'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jpaMappingContext': Invocation of init method failed; nested exception is org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: com.myproject.api.model.Cart.products[org.springframework.data.util.Pair]
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