在Hibernate JPA的ManyToMany關係中的錯誤

我在MySql Workbench上有一個大的數據庫，我試圖映射Eclipse Mars上的實體之間的關係，這要歸功於Hibernate和JPA模塊。事實是，我收到錯誤：「在屬性'personAddresses'中，」映射「屬性'peopleAdd'具有該關係的無效映射類型。」這是涉及的實體。在Hibernate JPA的ManyToMany關係中的錯誤

我一直說，做一個正向工程，休眠創造了我一個AddressId類，其中地址的複合主鍵映射。我懷疑問題可能是這個，但我不確定，你能幫我嗎？下我發佈的代碼，以便更清楚地瞭解類是如何實現的。

@Entity 
@IdClass(AddressId.class) 
@Table(schema = "YouDroop", name = "Address") 
public class Address implements Serializable 
{ 
... 

private Collection<Person> peopleAdd = new HashSet<Person>(); 

@Id 
@Column(name = "Address", length = 45, unique = true, nullable = false) 
private String address; 
@Id 
@Column(name = "Number", unique = true, nullable = false) 
private int number; 

... 

@ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL) 
@JoinTable(
      name = "PersonHasAddress", 
      joinColumns = { 
          @JoinColumn(name = "Address_Address", referencedColumnName = "Address", nullable = false), 
          @JoinColumn(name = "Address_Number", referencedColumnName = "Number", nullable = false) 
          }, 
      inverseJoinColumns = {@JoinColumn(name = "Person_Email", referencedColumnName = "Email", nullable = false)} 
      ) 
public Collection<Person> getPeopleAddressed(){ 
    return this.peopleAdd; 
} 

public void setPeopleAddressed(Collection<Person> people){ 
    this.peopleAdd = people; 
} 
} 

public class AddressId implements Serializable 
{ 

private String address; 
private int number; 

public AddressId(){} 

public AddressId(String address, int number) { 
    super(); 
    this.address = address; 
    this.number = number; 
} 

... 
} 

@Entity 
@Table(name = "Person", schema = "YouDroop", uniqueConstraints = 
{ @UniqueConstraint(columnNames = "NickName"), 
@UniqueConstraint(columnNames = "Password") }) 
public class Person implements Serializable 
{ 
... 

private Collection<Address> addresses = new HashSet<Address>(); 

... 

@ManyToMany(fetch = FetchType.LAZY, mappedBy = "peopleAdd") 
public Collection<Address> getPersonAddresses(){ 
    return this.addresses; 
} 

public void setPersonAddresses(Collection<Address> addresses){ 
    this.addresses = addresses; 
} 
}

來源

2015-10-15 MissArmstrong

由於您將@ManyToMany註釋放置在getter方法（或屬性）上，而不是放在字段上。 mappedBy屬性應該引用屬性，而不是字段。

@ManyToMany 
public Collection<Person> getPeopleAddressed() { 
... 
}

所以，你的mappedBy屬性應該是

@ManyToMany(mappedBy="peopleAddressed") 
public Collection<Address> getPersonAddresses() { 
... 
}

來源

2015-10-15 14:51:08 Ish

所以，如果我要地圖領域，我已經把註釋在球場上，而如果我要地圖的方法，我有沒有把註釋放在方法上（就像我所做的那樣）？這是對的嗎？ – MissArmstrong

是的，這是正確的。 – Ish

非常感謝你！ – MissArmstrong

在Hibernate JPA的ManyToMany關係中的錯誤

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