Hibernate @Id通过继承 [英] Hibernate @Id via inheritance

问题描述

我试图复制在.Net中可以做的事情，但没有太多的运气。

以下是Java中不可能的，或者我只是错过了一些东西？当我运行它时，我被告知没有为实体组指定标识符。

  public abstract class RCEntity 
 {
 @Id @GeneratedValue 
 private int id; 
 
 // getters& setters 
} 
 
 @Entity 
 public class Group extends RCEntity {
} 
  

解决方案

将注释 @MappedSuperclass 添加到您的超类中，即

  @MappedSuperclass 
 public abstract class RCEntity 
 {
 @Id @GeneratedValue 
 private int id; 
 
 // getters& setters 
} 
  

I'm trying to duplicate something you can do in .Net but not having much luck.

Is the following not possible in Java or am I just missing something? When I run it I get told there is no identifier specified for entity Group.

public abstract class RCEntity
{
   @Id @GeneratedValue
   private int id;

   //getters & setters
}

@Entity 
public class Group extends RCEntity {
}

解决方案

Add the annotation @MappedSuperclass to your super class, i.e.

@MappedSuperclass
public abstract class RCEntity
{
   @Id @GeneratedValue
   private int id;

   //getters & setters
}

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