how can I persist a superclass variables from child class in hibernate?

Question

I want to persist all variables in a superclass only from childclass

Example:

//This class is from an API, I cannot touch or change
class SuperClass {
    private String name;
    private String info;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getInfo() {
        return info;
    }

    public void setInfo(String info) {
        this.info = info;
    }
}

@Entity
class ChildClass extends SuperClass {
    @id
    private long id;
}

I want the table to have these columns (id, name, info)

Is it doable? If yes, How?

Answer 1

If the accessors are not set as final in the super class, you can override them in the child classes and add JPA annotations to the overridden accessor methods.

Example 1

---

class SuperClass { public String getName() { ... } public String getInfo() { ... }

@Entity
class ChildClass extends SuperClass {
  @Id
  private long id;

  public Long getId() { return id; }

  @Access(AccessType.PROPERTY)
  @Column(name = "name")
  public String getName() { return super.getName(); }

  @Access(AccessType.PROPERTY)
  @Column(name = "info")
  public String getInfo() { return super.getInfo(); }
}

Example 2

---

class SuperClass { public String getName() { ... } public String getInfo() { ... }

@MappedSuperClass
class NamedModel extends SuperClass {
  @Access(AccessType.PROPERTY)
  @Column(name = "name")
  public String getName() { return super.getName(); }

  @Access(AccessType.PROPERTY)
  @Column(name = "info")
  public String getInfo() { return super.getInfo(); }
}

@Entity
class ChildClass extends NamedModel {
  @Id
  private long id;
}

I have created a sample application using your code. Download the application and run the integration tests as mvn clean test and check the generated SQL to see the desired result.