[hibernate-issues] [Hibernate-JIRA] Created: (HHH-4073) discriminator formula creates problem in hibernate envers

[Saravana Kumar (JIRA)]

discriminator formula creates problem in hibernate envers
---------------------------------------------------------

                 Key: HHH-4073
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4073
             Project: Hibernate Core
          Issue Type: Bug
          Components: envers
    Affects Versions: 3.3.x
         Environment: hibernate-3.3.x, envers-1.2.1.ga-hibernate-3.3.jar (Oracle 10g or HSQLDB)
            Reporter: Saravana Kumar


I map my classes using Single Table per class hierarchy as below

@Entity
@DiscriminatorFormula ("(select t.c_type from t_type t where t.c_id = c_type)")
@Audited
public class Attribute...{
...
} 

     or
      
<discriminator type="string">
	<formula>(select t.c_type from t_type t where t.c_id = c_type)</formula>
</discriminator>


When I use envers 

I get the follwoing error

Caused by: java.lang.ClassCastException: org.hibernate.mapping.Formula
at org.hibernate.envers.configuration.metadata.MetadataTools.addColumns(MetadataTools.java:154)
at org.hibernate.envers.configuration.metadata.AuditMetadataGenerator.generateMappingData(AuditMetadataGenerator.java:263)
at org.hibernate.envers.configuration.metadata.AuditMetadataGenerator.generateFirstPass(AuditMetadataGenerator.java:345)
at org.hibernate.envers.configuration.EntitiesConfigurator.configure(EntitiesConfigurator.java:87)
at org.hibernate.envers.configuration.AuditConfiguration.(AuditConfiguration.java:86)
at org.hibernate.envers.configuration.AuditConfiguration.getFor(AuditConfiguration.java:99)
at org.hibernate.envers.event.AuditEventListener.initialize(AuditEventListener.java:260)
at org.hibernate.event.EventListeners$1.processListener(EventListeners.java:198)
at org.hibernate.event.EventListeners.processListeners(EventListeners.java:181)
at org.hibernate.event.EventListeners.initializeListeners(EventListeners.java:194)


When I tried to debug the problem

(AuditMetadataGenerator.java:263) has 

260:  // Checking if there is a discriminator column
261:       if (hasDiscriminator) {
262:            Element discriminator_element = class_mapping.addElement("discriminator");
263:            MetadataTools.addColumns(discriminator_element, pc.getDiscriminator().getColumnIterator());
264:            discriminator_element.addAttribute("type", pc.getDiscriminator().getType().getName());
265:        }

(MetadataTools.java:154) has 
152:    public static void addColumns(Element any_mapping, Iterator<Column> columns) {
153:        while (columns.hasNext()) {
154:            Column column = columns.next();
155:            addColumn(any_mapping, column.getName(), column.getLength(), column.getScale(), column.getPrecision(),
156:					column.getSqlType());
157:        }
158:    }

I see that there is nothing to handle Formula :-(

Can you investigate?

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