英文:
org.hibernate.MappingException: Could not determine type for custom object type
问题
Spring Boot 2.3
实体 Cart 拥有多个实体 CartItem。
以下是我的模型：
@Entity
public class Cart {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
@OneToMany(mappedBy = "cart", fetch = FetchType.EAGER,
cascade = CascadeType.ALL)
private Set<CartItem> cartItems;
}
@Entity
public class CartItem {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
private Product product;
private int quantity;
@ManyToOne(fetch = FetchType.EAGER, optional = false)
@JoinColumn(name = "cart_id", nullable = false)
private Cart cart;
}
@Entity
public class Product {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
@NotNull
private String name;
@ElementCollection
private Set<String> images;
}
但当我运行应用程序时，我收到以下错误：
Caused by: org.springframework.beans.factory.BeanCreationException: 在类路径资源 [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class] 中定义的名为 'mvcConversionService' 的 Bean 创建失败：通过工厂方法实例化 Bean 失败；嵌套异常是 org.springframework.beans.BeanInstantiationException：无法实例化 [org.springframework.format.support.FormattingConversionService]：工厂方法 'mvcConversionService' 抛出异常；嵌套异常是 org.springframework.beans.factory.BeanCreationException：在 com.myproject.eshop_orders.repo.CartRepository 中定义的名为 'cartRepository' 的 Bean 创建失败，该 Bean 在声明的 @EnableJpaRepositories 上定义：在设置 Bean 属性 'mappingContext' 时无法解析对 Bean 'jpaMappingContext' 的引用；嵌套异常是 org.springframework.beans.factory.BeanCreationException：名为 'jpaMappingContext' 的 Bean 创建失败：初始化方法调用失败；嵌套异常是 javax.persistence.PersistenceException：[PersistenceUnit：default] 无法构建 Hibernate SessionFactory；嵌套异常是 org.hibernate.MappingException：无法确定类型：com.myproject.eshop_orders.api.model.Product，在表格：cart_item，在列上：[org.hibernate.mapping.Column(product)]
英文:
Spring boot 2.3
Entity Cart has many entites CartItem.
So here my models:
@Entity
public class Cart {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
@OneToMany(mappedBy = "cart", fetch = FetchType.EAGER,
cascade = CascadeType.ALL)
private Set<CartItem> cartItems;
@Entity
public class CartItem {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
private Product product;
private int quantity;
@ManyToOne(fetch = FetchType.EAGER, optional = false)
@JoinColumn(name = "cart_id", nullable = false)
private Cart cart;
@Entity
public class Product {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
@NotNull
private String name;
@ElementCollection
private Set<String> images;
But when I run application I get error:
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcConversionService' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$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 'cartRepository' defined in com.myproject.eshop_orders.repo.CartRepository 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 javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.MappingException: Could not determine type for: com.myproject.eshop_orders.api.model.Product, at table: cart_item, for columns: [org.hibernate.mapping.Column(product)]
答案1
得分: 1
你在CartItem中使用了Product，但没有像@OneToOne这样的方式定义任何关联关系。因此，JPA将product视为CartItem表中的列，并且无法确定用于数据库列的product的兼容类型。这就是为什么错误显示为：
无法确定类型：com.myproject.eshop_orders.api.model.Product，
在表格：cart_item中，对于列：[org.hibernate.mapping.Column(product)]
可能在CartItem表中，你应该有与Product的@OneToOne关联关系：
@OneToOne
private Product product;
英文:
You are using Product in CartItem without defining any relation like @OneToOne. So JPA treats product as column in CartItem table and can not determine compatible type for product for database column. That's why error states that
Could not determine type for: com.myproject.eshop_orders.api.model.Product,
at table: cart_item, for columns: [org.hibernate.mapping.Column(product)
May be you have @OneToOne relation with Product in CartItem table.
@OneToOne
private Product product;
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