Hibernate: entity class name as identifier

Question

I want to make my entity a singleton. That singleton should be accessible from other entities.

So I decide to set its id manyally, like:

@Entity
@Table(name = "tableName")
public class SingletonEntity {

  @Id
  private int id = this.getClass().getSimpleName(); //IS IT POSSIBLE? HOW?

  //.......
}

Question:

How to achieve that? Please. give me an example.

EDIT:

It is worth to say that my SingletonEntity has only final string state. So I can say that its stateless. Actually, I don't want a singleton, I only want to set final id to that entity, and I want that id should be equals to SingletonEntity.class.getSimpleName()

For @Balaji Reddy:

I've tried:

@Entity
@Table(name = "Client")
public class Client implements Serializable {

    @Id
    @Column(name = "id")
    private static final String id = Client.class.getSimpleName();

    .................
}

And get:

No identifier specified for entity: db.Client

in string

ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");

Answer 1

Did you try using a constant?

private static final String CLASS_NAME = SingletonEntity.class.getSimpleName();

@Id
private String id = CLASS_NAME;

This is the initialization of the field of your entity, you can also do this in the constructor.

private SingletonEntity() {
    this.id = this.getClass.getSimpleName();
}

Answer 2

@Entity
@Table(name = "tableName")
public class SingletonEntity {

  @Id
  private static int id = this.getClass().getSimpleName(); //try something like this.

  //.......
}

Check EJB Specifications 3.1