在Hibernate JPA的ManyToMany关系中的错误

我在MySql Workbench上有一个大的数据库，我试图映射Eclipse Mars上的实体之间的关系，这要归功于Hibernate和JPA模块。事实是，我收到错误： “在属性'personAddresses'中，”映射“属性'peopleAdd'具有该关系的无效映射类型。” 这是涉及的实体。在Hibernate JPA的ManyToMany关系中的错误

我一直说，做一个正向工程，休眠创造了我一个AddressId类，其中地址的复合主键映射。我怀疑问题可能是这个，但我不确定，你能帮我吗？下我发布的代码，以便更清楚地了解类是如何实现的。

@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; 
} 
}

来源

2015-10-15 MissArmstrong

由于您将@ManyToMany注释放置在getter方法（或属性）上，而不是放在字段上。 mappedBy属性应该引用属性，而不是字段。

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

所以，你的mappedBy属性应该是

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

来源

2015-10-15 14:51:08 Ish

所以，如果我要地图领域，我已经把注释在球场上，而如果我要地图的方法，我有没有把注释放在方法上（就像我所做的那样）？这是对的吗？ – MissArmstrong

是的，这是正确的。 – Ish

非常感谢你！ – MissArmstrong

在Hibernate JPA的ManyToMany关系中的错误

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