JPA: Is there some way to implement inheritance for Embeddable-CodePudding

Here is the example code:

class Resource {
  Long id;
  @Embedded
  GPU gpu;
  CPU cpu;
}

abstract class GPU {
  String name;
  GpuType type;
}

class PhysicalGPU extends GPU {
}

class VirtualGPU extends GPU {
  private int partition;
}

I have an Entity Resource and it has a field GPU which is a superclass. It can be a VirtualGPU or PhysicalGPU. But JPA or Hibernate seems not support class inheritance for @Embedded fields. And it is ugly to create a single GPU type with no inheritance or create PhysicalGPUResource and VirtualGPUResource to implement the inheritance for a single field.

And I think as a descriptor of a Resource, make the GPU be an association in a seperate table (and give a ManyToOne relation in Resource) is also not a good practice but this will make the Inheritance available.

I did some search and I think right now the answer is no. But I still think this is a quite big requirement for the Hibernate ORM and it can be implemented in some framework like MyBatis, it is quite weird that Hibernate do not support this behavior. So maybe there is some other way to make this done?

CodePudding user response：

I think current the best way is using UserType. Follow the article Custom Types in Hibernate and the @Type Annotation can be very helpful.

But I still don't know what is the advantage of the CompositeUserType.