CODEWITHSUNDEEP
javahibernatespring-data
B_Osipiuk
B_Osipiuk

Reputation: 1038

Hibernate inheritance - OneToMany with 2 class that extend parent not work

I have 3 Entities:

@Data
@AllArgsConstructor 
@Entity 
@Table(name = "beneficiary") 
@Inheritance 
@DiscriminatorColumn(discriminatorType = DiscriminatorType.STRING, name = "type") 
public abstract class Beneficiary {   
    public Beneficiary() {}

      @Id private String id;

      private String description; 
}


@Data
@Entity
@DiscriminatorValue("company")
@EqualsAndHashCode(callSuper = true)
public class BeneficiaryCompany extends Beneficiary {
  public BeneficiaryCompany() {
    super();
  }

  public BeneficiaryCompany(String id, String description) {
    super(id, description);
  }
}


@Data
@Entity
@DiscriminatorValue("person")
@EqualsAndHashCode(callSuper = true)
public class BeneficiaryPerson extends Beneficiary {
  public BeneficiaryPerson() {}

  public BeneficiaryPerson(String id, String description) {
    super(id, description);
  }
}

An in the other class I want to have 2 separate collections:

@Data
@AllArgsConstructor
@Entity
@Table(name = "transaction")
public class Transaction {

  public Transaction() {}

  @Id private String id;

  private String description;

  @OneToMany(cascade = CascadeType.ALL, orphanRemoval = true, targetEntity = BeneficiaryCompany.class)
  @JoinColumn(name = "transaction_id", nullable = false)
  private Set<BeneficiaryCompany> beneficiaryCompanies;

  @OneToMany(cascade = CascadeType.ALL, orphanRemoval = true,targetEntity = BeneficiaryPerson.class)
  @JoinColumn(name = "transaction_id", nullable = false)
  private Set<BeneficiaryPerson> beneficiaryPeople;
}

The problem is that every Beneficiary was fetched into beneficiaryCompanies, and beneficiaryPeople in the debugger tells me that:

Unable to evaluate the expression Method threw 'org.hibernate.WrongClassException' exception.

The database records looks fine (DiscriminatorColumn was created). What could be the problem? Why beneficiaryCompanies contains BeneficiaryPerson objects?

@EDIT: To fetch the records I am using SpringData JPA repositories.

Upvotes: 2

Views: 512

Answers (2)

T3rm1
T3rm1

Reputation: 2532

Add @DiscriminatorOptions(force = true) to Beneficiary class. This will force Hibernate to use the discriminator when it fetches the collections.

Upvotes: 0

Ilya Sereb
Ilya Sereb

Reputation: 2571

Use @MappedSuperclass on your base class Beneficiary

Alexandar Petrov is absolutely correct. You have to remove @Entity because superclass is not an entity. When dealing with inheritance extending a class, you can use @MappedSuperclass annotation on the base class, in your case, it is Beneficiary.

Edit: This is a very good article you can refer to.

Upvotes: 3

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