JPA 多对多关系 "JoinColumn cannot be resolved to a type" 错误

Question

我正在使用 Spring 启动并尝试在用户和技能之间实现多对多关系。我有一个包含 user_id 和 skill_id 列的 table users_skills。尝试实现关系时，我在 STS 中的 @JoinColumn 注释中不断收到 "JoinColumn cannot be resolved to a type" 错误。下面是我的用户 class

   @Entity
   @Table(name = "users")
   public class User {


@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private long id;
private String email;
private String firstName;
private String lastName;
private List<Skill> skills = new ArrayList<Skill>();



protected User() {}

public User(String email,String firstName, String lastName) {
    this.email = email;
    this.firstName = firstName;
    this.lastName = lastName;
}    


public Long getId() {
    return this.id;
}

public void setId(Long id) {
    this.id = id ;
}

public String getEmail() {
    return this.email;
}

public void setEmail(String email) {
    this.email = email ;
}


public String getFirstName() {
    return this.firstName;
}

public void setFirstName(String firstName) {
    this.firstName = firstName ;
}

public String getLastName() {
    return this.lastName;
}

public void setLastName(String lastName) {
    this.lastName = lastName ;
}

@ManyToMany
@JoinTable(name="users_skills", 
            joinColumns={@JoinColumn(name="user_id")},              
          inverseJoinColumns={@JoinColumn(name="skill_id")})    
public List<Skill> getSkills(){
    return skills;
}

public void setSkills(List<Skill> skills) {
    this.skills = skills ;
}

}

Answer 1

把这个写在你的 class

的开头

import javax.persistence.JoinColumn;

有时 eclipse 不显示 link 以在上下文菜单中导入它，但它在那里。希望对大家有所帮助。

JPA 多对多关系 "JoinColumn cannot be resolved to a type" 错误

JPA ManytoMany Relationship "JoinColumn cannot be resolved to a type" error

java

spring

many-to-many

jpa