[castor-dev] JDO Inheritence

[Reza Shahbazi]

Hi All

Problem: in JDO Inheritence
It works fine if I want to make my objects prisistent, as described in tips-tricks.html.
But when I try to load my master object (or instance of it) it doesn't properly load the dependent objects;

Here is example:
I have four objects

1-Animal.java
2-Dog.java (extends Animal)
3-Cat.java (extends Animal)

4- Owner.java Animal _animal; //instance varible

Dog _dog= new Dog(...);
Owner _owner = new Owner(..);
_owener.setAnimal(_dog);

db.begin
db.create(_dog);
db.create(_owner);
db.commit;
It works fine, I have on record in Animal table and with same Identifier (primary key)
in dog table (extra info are stored in dog table)


When I try ot load it
Owner _owner = (Owner)db.load(Owner.class,new Integer(1));
_owner.getAnimal() has the value of the Animal NOT Dog!!!!!

I my real application I got :
java.lang.IllegalArgumentException: object is not an instance of declaring class
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.exolab.castor.persist.FieldMolder.getValue(FieldMolder.java:253)
at org.exolab.castor.persist.ClassMolder.getActualIdentity(ClassMolder.java:2607)
at org.exolab.castor.persist.ClassMolder.getActualIdentity(ClassMolder.java:2593)
at org.exolab.castor.persist.ClassMolder.getIdentity(ClassMolder.java:2581)
at org.exolab.castor.persist.ClassMolder.getRemovedIdsList(ClassMolder.java:1684)
at org.exolab.castor.persist.ClassMolder.preStore(ClassMolder.java:1291)
at org.exolab.castor.persist.LockEngine.preStore(LockEngine.java:723)
at org.exolab.castor.persist.TransactionContext.prepare(TransactionContext.java:1409)
at org.exolab.castor.jdo.engine.DatabaseImpl.commit(DatabaseImpl.java:507)
at com.symax.dms.testDB.create(testDB.java:247)
at com.symax.dms.testDB.main(testDB.java:65)


Thanks
Reza

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