2 Replies Latest reply on Jul 16, 2006 11:15 AM by abl

Deployment error mapping a parent/child related entity

abl Jul 14, 2006 12:18 PM

I have a self-referencing entity hierarchy like that:

@Entity
@Inheritance(strategy=InheritanceType.JOINED)
public abstract class HrcEntity<T extends HrcEntity> extends ComplexEntity
{
 private List<T> children;
 private T parent;

 @OneToMany(mappedBy="parent", cascade=CascadeType.REMOVE)
 public List<T> getChildren()
 {
 return children;
 }

 @ManyToOne(fetch=FetchType.LAZY)
 public T getParent()
 {
 return parent;
 }

}

@Entity
@Inheritance(strategy=InheritanceType.JOINED)
public class Node extends HrcEntity<Node>
{
 ...
}

so I can do for example:

List<Node> children = node.getChildren();

but deploying these entities I get the error:
"java.lang.IllegalStateException: Property parent has an unbound type and no explicit target entity."

from my point of view this should work - there is is a table HrcEntity in db and hibernate simply has to map the column "parent" to the same table.

btw. - if I make HrcEntity non-generic it works, but I get very ugly code with lot of casts and "instanceof"

any comments? thanks!

1. Re: Deployment error mapping a parent/child related entity

elkner Jul 15, 2006 4:52 AM (in response to abl)

= unbound type ...
Actions

2. Re: Deployment error mapping a parent/child related entity

abl Jul 16, 2006 11:15 AM (in response to abl)

I have a similar construct in another part of the system:

@Entity
public class BasketItem<T extends ComplexEntity>
{
 private T object;

 @ManyToOne(fetch=FetchType.LAZY, optional=false)
 public T getObject()
 {
 return object;
 }
 public void setObject(T object)
 {
 this.object = object;
 }
...
}

@Entity
public class AssetBasketItem extends BasketItem<Asset>
{
...
}

this is getting deployed and works. what is the difference?

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