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hibernate, xDoclet and subclass

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remasuri123

Post subject: hibernate, xDoclet and subclass

Posted: Tue Feb 24, 2004 8:17 am

Newbie

Joined: Tue Feb 24, 2004 8:08 am
Posts: 4

hi all

im new to hibernate and try to create a class hierarchy which is persited using hibernate.
i create the hbm.xml files using xDoclet and everything is fine if i dont have any subclasses. but when i run xDoclet it does not create the mapping files for

Quote:

@hibernate.subclass

and i run into problems when exporting the schema.

what tags are required to create subclass mapping files ?
what is the preferred scheme (one table per class, one table per hierarchy...)

thanks for your help

rema[/quote]

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tcollins

Post subject:

Posted: Tue Feb 24, 2004 10:38 am

Beginner

Joined: Tue Jan 27, 2004 2:14 pm
Posts: 40
Location: Atlanta, GA, USA

Parent Class...
@hibernate.class table="User" discriminator-value="U"
@hibernate.discriminator column="subclass" type="character"

All SubClasses...
@hibernate.subclass discriminator-value="C"
(with different value for each class)

You must declare the discriminator. Read the docs it's all there.

http://www.hibernate.org/hib_docs/reference/html/inheritance.html

hope this helped

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hrdill

Post subject:

Posted: Tue Sep 28, 2004 4:45 pm

Newbie

Joined: Tue Sep 28, 2004 4:13 pm
Posts: 3

I believe what you're missing is that the subclass also has to be declared as a class in and of itself...

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hrdill

Post subject:

Posted: Thu Oct 07, 2004 2:46 pm

Newbie

Joined: Tue Sep 28, 2004 4:13 pm
Posts: 3

Scratch my last post. However, I am having the same issue. XDoclets are as follows:

Code:

 
Event.java:
 * @hibernate.class
 *      table="EVENT_LOG"
 *      polymorphism="implicit"
 * 
 * // Not fully-qualified!
 * @hibernate.discriminator
 *      column="EVENT_TYPE" 
 *      type="string"
 *      length="64"
 * 
 *  
 */
public abstract class Event implements Serializable { with some columns and an ID, EVENT_TYPE not listed as a column. }


DocEvent.java:
* @hibernate.subclass
 *      discriminator-value="DocEvent"
 *   
 * 
 *      
 */
public class DocEvent extends Event { 1 more ancillary column... }

This only generates Event.hbm.xml - with the subclass properly listed inside and all that - but not DocEvent.hbm.xml. The subsequent problem is:

Code:

14:38:06,729  INFO net.sf.hibernate.cfg.Configuration:347 - Mapping resource: com/whoever/util/logger/DocEvent.hbm.xml
------------- ---------------- ---------------

Testcase: testSingleEvent took 2.141 sec
   Caused an ERROR
Error instantiating database persistence layer: Resource: com/whoever/util/logger/DocEvent.hbm.xml not found
com.whoever.util.logger.EventException: Error instantiating database persistence layer: Resource: com/whoever/util/logger/DocEvent.hbm.xml not found
   at...

Questions: 1. Should there be a DocEvent.hbm.xml generated?
2. If not, why is this failing?

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hrdill

Post subject:

Posted: Thu Oct 07, 2004 3:25 pm

Newbie

Joined: Tue Sep 28, 2004 4:13 pm
Posts: 3

Grumble... problem found. The .hbm.xml it was searching for had been programmatically declared elsewhere, unbeknownst to me.

Rema - go find where your subclass is loaded programmatically, or in your .cfg.xml file, and blow it away. You don't need the mapping file for the subclass - just make sure the subclass info is in the class' mapping file.

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