org.hibernate.PropertyAccessException：无法使用复合键设置字段值

Question

Using Spring Boot with Hibernate JPA

I am having trouble accessing a DAO for an @Entity which has a composite key where one of the columns is a foreign key. It's giving me org.hibernate.PropertyAccessException: Could not set field value [...] by reflection when I try to do a findOne() using the DAO.

So I have two MySQL relations, all_contacts and contact_phones , represented in order here:

contact_phones has a composite primary key consisting of contactid + number , of those two, contactId is also a foreign key for the same value in all_contacts . I've established the relationship using the proper @OneToMany and @ManyToOne annotations

Entity for all_contacts:

    @Entity
    @Table(name = "all_contacts")
    public class Contact {

      @Column(name="userid", columnDefinition ="bigint(13)")
      private BigInteger userId;

      @Id
      @GeneratedValue(strategy = GenerationType.AUTO)
      @Column(name="contactid", columnDefinition ="bigint(13)")
      private BigInteger contactId;


     @OneToMany(mappedBy = "contact", cascade = CascadeType.ALL)
     @ElementCollection(targetClass=ContactPhones.class)
     private Set<ContactPhones> phones = new HashSet<ContactPhones>(0);

    // the rest of the fields, including getters and setters

    }

Entity for contact_phones:

@Entity
@Table( name ="contact_phones")
@IdClass(ContactPhonesKey.class)
public class ContactPhones {


  @ManyToOne(fetch = FetchType.LAZY)
  @JoinColumn(name="contactid", nullable = false)
  @Id
  private Contact contact;

  @Column(name="phone_type", columnDefinition = "")
  private String phoneType;

  @Id
  @Column(columnDefinition ="bigint(13)")
  private BigInteger number;

  // getters and setters
}

And, because the primary key of the contact_phones class was composite (hence the @IdClass(ContactPhonesKey.class) ), I was forced to create a Key class to direct it:

Class for ContactPhonesKey:

public class ContactPhonesKey implements Serializable {

  private Contact contact;
  private String number;

  public ContactPhonesKey() {}

  public ContactPhonesKey(Contact contact, String number) {
    this.contact = contact;
    this.number = number;
  }

// getters and setters 

}

However, whenever I try to access something by the DAO (when I have created an instance of it by @Autowired) I made for the contact_phones class:

public interface ContactPhonesRepository extends CrudRepository<ContactPhones, BigInteger> {

  List<ContactPhones> findByNumberContaining(String number);


  @Query(value ="SELECT * FROM contact_phones cp WHERE cp.contactid= :contactId",
          nativeQuery=true)
  List<ContactPhones> findAllPhonesByContactId(@Param("contactId")BigInteger contactId);

}

I am getting an error about not being able to set the ContactPhonesKey class due to reflection. Here's the full error I get:

Could not set field value [111456666] value by reflection : [class app.models.relationentities.ContactPhonesKey.number] setter of app.models.relationentities.ContactPhonesKey.number; nested exception is org.hibernate.PropertyAccessException: Could not set field value [111456666] value by reflection : [class app.models.relationentities.ContactPhonesKey.number] setter of app.models.relationentities.ContactPhonesKey.number

Answer 1

There's a type mismatch on the field number between your entity ContactPhones and ID Class ContactPhonesKey . On the entity, it is declared as BigInteger , while on the ID Class, it is declared as String .