Hi I am using Hibernate4 in my application.
I am using @Any annotation. Now my requirement is to write a join query.
@Entity
@Table(name="tag_mappings")
@SuppressWarnings("serial")
public class TagMapping extends Persistent {
........
private Taggable taggable;
........
@Any(metaColumn = @Column(name = "taggable_type"))
@AnyMetaDef(idType = "long", metaType = "string",
metaValues = {
@MetaValue(targetEntity = com.myorg.model.tags.ServiceGroup.class, value = "SERVICEGROUP"),
@MetaValue(targetEntity = com.myorg.model.device.Device.class, value = "DEVICE")
})
@JoinColumn(name="taggable_id")
public Taggable getTaggable() {
return taggable;
}
--settermethod--
...
}
-----------------------------------------------------------------------------------------------------
public interface Taggable {
/**
* @return the persisted Id of a taggable entity
*/
public abstract long getId();
/**
* @return the name of the taggable entity
*/
public abstract String getName();
/**
* @return the class name of the taggable entity
*/
public abstract String getEntityType();
}
And com.myorg.model.tags.ServiceGroup.class and com.myorg.model.device.Device.class are the two model classes which implements the Taggable interface.
Now can i write a Hibernate Criteria query to get the attributes of a Taggable element.
While i am trying to get the attributes by joining, i am getting an exception like unable to cast any type to component type.
Do i have any api for above requirement.
My requirement is to join TagMapping and Device or ServiceGroup
