EclipseLink错误:实体类没有指定主键.它应该定义@ Id,@ EmbeddedId或@IdClass

@Entity
@Table(name = "my_table")
public class MyEntity {

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

    private String name;

    // getters and setters
}

@Entity
@Table(name = "my_table")
public class MyEntity {

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

    private String name;

    @EmbeddedId
    private Key key;

    // getters and setters
}