Bugs item #663037, was opened at 2003-01-06 02:57
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=428708&aid=663037&group_id=40712
Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Interface Inheritance not seen at Runtime
Initial Comment:
Hi!
Congratulations for Hibernate !
In our project, we are going to migrate from JDO to
Hibernate !
I encounter only one little pb with the use of Java
Interface in the mapping file, the hierachie of Interfaces
is ignored by hibernate.
Example:
Java Interfaces :
<<<<
package interfaces;
public interface Reference {
public abstract void setRef(String ref);
public abstract String getRef();
}
>>>>
<<<<
package interfaces;
public interface Referenceable {
public Reference getReference();
public void setReference(Reference reference);
}
>>>>
<<<<
package interfaces;
import java.util.Collection;
public interface Child extends Referenceable {
public Collection getParents();
public void setParents(Collection parents);
public Collection getAncestors();
public void setAncestors(Collection ancestors);
public boolean addParent(Parent parent);
public boolean removeParent(Parent parent);
public boolean isChildOf(Parent parent);
public boolean isDescendentOf(Parent ancestor);
}
>>>>
<<<<
package com.agrochannels.qxe;
import java.util.Collection;
public interface Parent extends Child {
public Collection getChildren();
public void setChildren(Collection children);
public Collection getDescendents();
public void setDescendents(Collection descendents);
public boolean addChild(Child child);
public boolean removeChild(Child child);
public boolean isParentOf(Child child);
public boolean isAncestorOf(Child child);
}
>>>>
And We have Implementations:
<<<<
package implementation;
public class ReferenceImpl implements Reference,
Serializable, UserType {
..
}
>>>>
<<<<
package implementation;
public abstract class ReferencedObjectImpl implements
Referenceable, Serializable {
..
}
>>>>
<<<<
package implementation;
public class ChildImpl extends ReferencedObjectImpl
implements Child {
..
}
>>>>
<<<
package implementation;
public class ParentImpl extends ChildImpl implements
Parent {
..
}
>>>
And with this hibernate mapping file :
<<<<
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 1.1//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-
1.1.dtd">
<hibernate-mapping>
<!-- interfaces.Referenceable root -->
<class name="interfaces.Referenceable"
table="Referenceable">
<id name="reference"
type="implementation.ReferenceImpl">
<generator
class="assigned"/>
</id>
<discriminator/>
<subclass
name="implementation.ReferencedObjectImpl">
</subclass>
<subclass
name="interfaces.Child">
<bag role="parents"
table="parents"
lazy="true"
cascade="all">
<key
column="child_ref"/>
<many-to-
many class="interfaces.Parent" column="parent_ref"/>
</bag>
<bag role="ancestors"
table="ancestors"
lazy="true"
cascade="all">
<key
column="child_ref"/>
<many-to-
many class="interfaces.Parent" column="parent_ref"/>
</bag>
<subclass
name="implementation.ChildImpl">
</subclass>
<subclass
name="interfaces.Parent">
<bag
role="children"
table="parents"
readonly="true"
lazy="true"
cascade="all">
<key column="parent_ref"/>
<many-to-many class="interfaces.Child"
column="child_ref"/>
</bag>
<bag
role="descendents"
table="ancestors"
readonly="true"
lazy="true"
cascade="all">
<key column="parent_ref"/>
<many-to-many class="interfaces.Child"
column="child_ref"/>
</bag>
<subclass
name="implementation.ParentImpl">
</subclass>
</subclass>
</subclass>
</class>
</hibernate-mapping>
>>>>
I can export the schema with
cirrus.hibernate.tools.SchemaExport but at Runtime
I get this exception :
[java] cirrus.hibernate.PropertyNotFoundException:
Could not find a getter
for reference in class interfaces.Child
[java] at
cirrus.hibernate.helpers.ReflectHelper.getGetter
(ReflectHelpe
r.java:198)
[java] at
cirrus.hibernate.helpers.ReflectHelper.setter
(ReflectHelper.j
ava:164)
[java] at
cirrus.hibernate.helpers.ReflectHelper.getSetter
(ReflectHelpe
r.java:145)
[java] at
cirrus.hibernate.persister.AbstractEntityPersister.<init>
(Abs
tractEntityPersister.java:487)
[java] at
cirrus.hibernate.persister.EntityPersister.<init>
(EntityPersi
ster.java:641)
[java] at
cirrus.hibernate.impl.SessionFactoryImpl.<init>
(SessionFactor
yImpl.java:192)
[java] at
cirrus.hibernate.impl.DatastoreImpl.buildSessionFactory
(Datas
toreImpl.java:403)
[java] at
cirrus.hibernate.impl.DatastoreImpl.buildSessionFactory
(Datas
toreImpl.java:392)
Or the getReference() method in Child is inherited from
Referenceable !
I have a workaround :
When I add explicitly the necessary methods in Child
and other Interfaces, it works.
I think that it seems only necessary to correct the
method cirrus.hibernate.helpers.ReflectHelper.getGetter()
to deal with interfaces and their inheritance.
I hope It was clear (I could have provided a simplier
example with 2 interfaces, my english is not very
good...).
Thanks,
Frank
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