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Extending a annotaded class

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rodrigo.bmts

Post subject: Extending a annotaded class

Posted: Wed May 23, 2007 8:38 am

Newbie

Joined: Tue Aug 16, 2005 9:21 am
Posts: 12

hi,

I'm facing the following problem: All my mapped objects extend an abstract class, and some of them has a kind of template classes, well, I'd like to know if I could put some annotations on these templates. I`ve tried, but the hibernate doesn`t get these annotations.

Is there some annotation to "say" to hibernate to get the annotations in the super class? Or another solution.

Code:

@Entity
 public abstract class Base<T extends Serializable> implements  
      Serializable {
   private T id = null;
   ...
   @Id
   public T getId() {
     return id;
   }
   ...
 }
 
 @Table(name = "company")
 public class Company extends Base<Integer> {
   private String name = null;
   @Column(length = 40)
   public String getName() {
      return name;
   }
...
 }

Best regards,
Rodrigo Souza
Brazil - SP

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dderry

Post subject: Extending a annotaded class

Posted: Wed May 23, 2007 11:47 am

Newbie

Joined: Wed Jan 10, 2007 3:07 pm
Posts: 8

I don't know if this will be much of a help. I'm struggling with getting a handle on annotations myself. But instead of @Entity on your base class, I think you should try @EmbeddableSuperclass

We also use a common base class for all our persistent classes, and it is annotated like this

Code:

@EmbeddableSuperclass(access = AccessType.FIELD)
public abstract class PersistentObject implements Serializable
{
    @Id(generator = "system-uuid")
    @GenericGenerator(name = "system-uuid", strategy = "uuid")
    @Column(name = "oid", length=32)
    private String oid;
    ...
}

@Entity(access = AccessType.FIELD)
@Table(name = "rio_query")
public class Interrogation extends PersistentObject
{
    ...
}

I think this might be like what you're trying to accomplish.

regards,
Dave

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rodrigo.bmts

Post subject:

Posted: Wed May 23, 2007 1:29 pm

Newbie

Joined: Tue Aug 16, 2005 9:21 am
Posts: 12

Thanks Dave, it works! with a little adjust, annotation @EmbeddableSuperclass was replaced by @MappedSuperclass
This tip help me a lot!

http://java.sun.com/javaee/5/docs/api/javax/persistence/MappedSuperclass.html

Big hug
Rodrigo G. Tavares de Souza
Brazil - SP

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