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我從頭開始一個新的項目，我得到了這個問題，我無法解決。我有三個實體，他們彼此之間都有很多很多的關係。還有就是集羣：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() +
'}';
}
}
這是用戶：
@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 +
'}';
}
}
這是鐸：
@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()+
'}';
}
}
，當我嘗試使用Maven我得到的mappedBy以下錯誤編譯，就好像它寫在關係的兩邊，但實際上它只寫在一邊：
Caus編輯：org.hibernate.AnnotationException：非法使用mappedBy在關係兩邊：User.users_cluster
任何人都有任何想法我做錯了什麼？
你已經告訴休眠，你從用戶到列表的關係被映射到類用戶（本身）。這會產生某種遞歸。我不認爲你可以在這種情況下使用mappedBy屬性。它通常在實體A和B之間存在關係時告訴哪一方是所有者。但是你有一個從實體用戶到自己的關係。用mappedBy定義一個所有者是沒有意義的（至少對我來說）。 –
順便說一句：雖然我不太瞭解你的實體正在建模什麼，但你寫了3個實體具有彼此的ManyToMany關係，但在用戶中它與它自己只有2個ManyToMany關係。應該不是用戶列表和列表而不是兩個列表？ –