为什么我不能覆盖和注释实体映射的getter方法？

Question

Given this class:

@MappedSuperclass
public abstract class AbstractEntity {

    int id;
    public void setId(int id) { this.id = id; }
    public int getId() { return id; }

    // other mappings
}

I want to define an entity:

@Entity
public class SomeEntity extends AbstractEntity {

    @Override
    @Id // or @OneToOne etc.
    public int getId() { return id; }
}

But this fails with a "No identifier specified" (or a "Could not determine type for") error on SomeEntity. If I remove the getter from the superclass it works. Can't I do this override strategy? Why not, or if yes - how?

Adding

@AttributeOverride(name = "id", column = @Column(name = "ID"))

to the subclass does not change the error.

Answer 1

For you to create an entity class there are requirements that the class must meet. Ex. must have a public/private constructor.

Here is the list of requirements:

http://docs.oracle.com/javaee/5/tutorial/doc/bnbqa.html

Hope this helps.