springboot中的抽象类继承

Question

I am a bit confused in regards to abstract classes and help would be great.

I have a the following classes

 public abstract class AbstractUser{
    private String username;
    private String password;
}

And then I have this class

@Entity
public class Company extends AbstractUser{
  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  private Long id;
  private String company_name
}

Now when I launch the application and I check the h2-console, the table Company only has the id and company_name. not the abstract classes variables. Is there a way to make it so it gets all the variables?

thank you in advance

Answer 1

To resolve this, you will need JPA annotation on your abstract class. This is not specific to Spring Boot, it's JPA thing.

You can apply @MappedSuperclass on your abstract class and that should resolve this issue. Find More: Inherit Super Class Properties

Answer 2

You can use @MappedSuperclass Jpa annotation on the AbstractUser, Also consider moving the id attribute to the abstract class.

@MappedSuperclass
public abstract class AbstractUser{

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String username;

    private String password;
}