How do I embed non-annotated legacy components?

tantastik · **Joined:** Fri Jan 05, 2007 4:36 pm **Posts:** 3

Hi,

I'm trying to build an Hibernate/EJB 3.0 application (application.jar) that depends on a non-EJB library (framework.jar), and I'd like to use @Embedded components however the legacy components cannot be modified or marked as @Embeddable.

Is there a way to do this with Hibernate Annotations?

Example: application.jar

Code:

@Entity
public class Profile {
     @Embedded
     private PaymentInstrument instrument;

     // getters and setters omitted
}

Example: framework.jar

Code:

public class PaymentInstrument {
     private String instrumentNumber;
     private String routingNumber;

     // getters and setters omitted
}

emmanuel · **Posted:** Wed Jan 10, 2007 4:26 pm

yes, your mapping will work. If you want to override the column name you can also use @AttributeOverride(s) where @Embedded is

tantastik · **Joined:** Fri Jan 05, 2007 4:36 pm **Posts:** 3

Hi, there,

Thanks very much for your reply, that works great!

My next problem is on how to persist custom types that are part of legacy components.

For example, if I had the above code sample with the following modification to "PaymentInstrument":

Example: framework.jar

Code:

public class PaymentInstrument {
     private String instrumentNumber; 
     private String routingNumber; 

     private PaymentChannel channel;

     // getters and setters omitted 
}

where PaymentChannel is:

Code:

public class PaymentChannel {
     private int type;
     private String description;

     // remaining code omitted
}

Normally, I would demark the PaymentChannel with @Type and use a custom implementation of org.hibernate.usertype.UserType, but in this case, I have no access to the legacy class. Any suggestions on how to persist this custom type in the database?

Thanks for your time,
Tan

emmanuel · **Posted:** Fri Jan 12, 2007 8:07 pm

you can't, you'll have to rely on an hm.xml file to map this entity