此类不定义IdClass

Question

My for classclassItem是对Class1中条目的引用。Hibernate需要我定义@IdClass。使用Class1的Id，定义自己的类对我来说不起作用。

这是我收到的错误：

org.springframework.beans.factory.UnsatisfiedDependencyException：在类路径资源[org/springFramework/boot/autoconfiure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]中创建名为'Request estMappingHandlerAdapter'的bean时出错：通过方法'Request estMappingHandlerAdapter'参数1表示的不满足的依赖；嵌套异常org.springframework.beans.factory.BeanCreationException：在类路径资源[org/springFramework/boot/autoconfiure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]中创建名为'mvcConversionService'的bean时出错：通过工厂方法进行Bean实例化失败；嵌套异常org.springframework.beans.BeanInstantiationException：实例化失败[org.springframework.format.support.FormattingConversionService]：工厂方法'mvcConversionService'抛出异常；嵌套异常org.springframework.beans.factory.BeanCreationException：创建名为'bookItemRepository'的bean时出错：初始化方法调用失败；嵌套异常java.lang.IllegalArgumentException：此类[类de.models.Class1Item]未定义IdClass

都在同一个包中的相关类:

import javax.persistence.*;
import javax.validation.constraints.NotNull;

import lombok.*;

import java.io.Serializable;
import java.time.LocalDate;
import java.util.List;

@Entity
@Setter
@Getter
@NoArgsConstructor
@IdClass(Class1ItemId.class)
public class Class1Item implements Serializable {

    @Id
    @ManyToOne
    @JoinColumn(name="reference")
    private Class1 class1;

    @NotNull
    @GeneratedValue
    private Long number;

    @Column(name="date_one")
    private LocalDate date1;

    @Column(name="date_x")
    private LocalDate dateX;

    @ManyToOne
    @JoinColumn(name="userReference")
    private User userReference;

    @ManyToMany
    @JoinColumn(name="waitingUsers")
    private List<User> waitingUsers;

    @NotNull
    @Enumerated(EnumType.STRING)
    @Column(name="enumX")
    private EnumX enumX;

}

import javax.persistence.*;
import javax.validation.constraints.NotBlank;

import lombok.*;

import java.io.Serializable;

@Entity
@Setter
@Getter
@NoArgsConstructor
public class Class1 implements Serializable {

    @Id
    @NotBlank
    private String key;

    @NotBlank
    private String name;

    @NotBlank
    private String nameF;

    @NotBlank
    private String nameL;

    private String path;
}

import javax.persistence.*;
import javax.validation.constraints.NotNull;

import lombok.*;

import java.io.Serializable;
import java.util.Set;

@Entity
@Setter
@Getter
@NoArgsConstructor
public class User implements Serializable {

    @Id
    @Column(name="UserID")
    private Long id;

    @NotNull
    @Column(name="email",unique=true)
    private String email;

    @NotNull
    @Column(name="user_firstname")
    private String firstName;

    @NotNull
    @Column(name="user_lastname")
    private String lastName;

    @NotNull
    @Column(name="isAdmin")
    private Boolean isAdmin;

    @ManyToMany
    @Column(name="wantedItems")
    private Set<Class1Item> wantedItems;

    @OneToMany
    @Column(name="borrowedItems")
    private Set<Class1Item> itemsBorrowed;
}

import javax.persistence.Id;
import java.io.Serializable;

public class Class1ItemId implements Serializable {
    @Id
    private String key;
}

当实际定义了IdClass时，如何修复此错误？

Answer 1

您定义了一个@IdClass，但没有在 ClassItem @Entity中重新声明的密钥。它们必须匹配。

您需要像这样添加它们：

@Entity
@IdClass(Class1ItemId.class)
// others
public class Class1Item implements Serializable {

    @Id
    private String key; // from your Class1ItemId

  // others

}