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我从头开始一个新的项目，我得到了这个问题，我无法解决。我有三个实体，他们彼此之间都有很多很多的关系。还有就是集群：休眠mappedBy和ManyToMany
@Entity
@Component
@Table(name = "clusterEntity")
public class Cluster {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id", nullable = false, updatable = false)
private Long id;
@Column(name = "name")
private String name;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@ManyToMany
@JoinTable(name="cluster_user",
[email protected](name="cluster_id", referencedColumnName="id"),
[email protected](name="user_id", referencedColumnName="id"))
private List<User> users_cluster;
@ManyToMany
@JoinTable(name="cluster_sito",
[email protected](name="cluster_id", referencedColumnName="id"),
[email protected](name="sito_id", referencedColumnName="id"))
private List<Sito> sitos;
@Override
public String toString() {
return "Cluster{" +
"id=" + id +
", name='" + name +
", users='" + users_cluster.toString() +
'}';
}
}
这是用户：
@Entity
@Component
@Table(name = "userEntity")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id", nullable = false, updatable = false)
private Long id;
@Column(name = "email", nullable = false, unique = true)
private String email;
@Column(name = "password_hash", nullable = false)
private String passwordHash;
@Column(name = "role", nullable = false)
@Enumerated(EnumType.STRING)
private Role role;
@Column(name = "G1", nullable = true)
private String G1;
@Column(name = "G2", nullable = true)
private String G2;
@Column(name = "G3", nullable = true)
private String G3;
@Column(name = "G4", nullable = true)
private String G4;
@Column(name = "G5", nullable = true)
private String G5;
@Column(name = "G6", nullable = true)
private String G6;
@Column (name = "access_token", nullable = true)
private String access_token;
@Column (name = "refresh_token", nullable = true)
private String refresh_token;
public Long getId() {
return id;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPasswordHash() {
return passwordHash;
}
public void setPasswordHash(String passwordHash) {
this.passwordHash = passwordHash;
}
public Role getRole() {
return role;
}
public void setRole(Role role) {
this.role = role;
}
public String getG1() {
return G1;
}
public void setG1(String g1) {
G1 = g1;
}
public String getG2() {
return G2;
}
public void setG2(String g2) {
G2 = g2;
}
public String getG3() {
return G3;
}
public void setG3(String g3) {
G3 = g3;
}
public String getG4() {
return G4;
}
public void setG4(String g4) {
G4 = g4;
}
public String getG5() {
return G5;
}
public void setG5(String g5) {
G5 = g5;
}
public String getG6() {
return G6;
}
public void setG6(String g6) {
G6 = g6;
}
public String getAccess_token() {
return access_token;
}
public void setAccess_token(String access_token) {
this.access_token = access_token;
}
public String getRefresh_token() {
return refresh_token;
}
public void setRefresh_token(String refresh_token) {
this.refresh_token = refresh_token;
}
@ManyToMany(mappedBy="users_cluster")
private List<User> users_cluster;
@ManyToMany(mappedBy="users_sito")
private List<User> users_sito;
public User(){}
@Override
public String toString() {
return "User{" +
"id=" + id +
", email='" + email.replaceFirst("@.*", "@***") +
", passwordHash='" + passwordHash.substring(0, 10) +
", role=" + role +
'}';
}
}
这是铎：
@Entity
@Component
@Table(name = "sitoEntity")
public class Sito {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id", nullable = false, updatable = false)
private Long id;
@Column(name = "name")
private String name;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@ManyToMany
@JoinTable(name="sito_user",
[email protected](name="sito_id", referencedColumnName="id"),
[email protected](name="user_id", referencedColumnName="id"))
private List<User> users_sito;
@Override
public String toString() {
return "Sito{" +
"id=" + id +
", name='" + name+
", users='" + users_sito.toString()+
'}';
}
}
，当我尝试使用Maven我得到的mappedBy以下错误编译，就好像它写在关系的两边，但实际上它只写在一边：
Caus编辑：org.hibernate.AnnotationException：非法使用mappedBy在关系两边：User.users_cluster
任何人都有任何想法我做错了什么？
你已经告诉休眠，你从用户到列表的关系被映射到类用户（本身）。这会产生某种递归。我不认为你可以在这种情况下使用mappedBy属性。它通常在实体A和B之间存在关系时告诉哪一方是所有者。但是你有一个从实体用户到自己的关系。用mappedBy定义一个所有者是没有意义的（至少对我来说）。 –
顺便说一句：虽然我不太了解你的实体正在建模什么，但你写了3个实体具有彼此的ManyToMany关系，但在用户中它与它自己只有2个ManyToMany关系。应该不是用户列表和列表而不是两个列表？ –