BuyWritePosition is a subclass of OptionPosition, but they are mapped to the same database table option_position. Here is the OptionPosition.hbm.xml:

<hibernate-mapping default-lazy="false">

<class name="com.ameraust.investor.option.strategy.OptionPosition" table="option_position" abstract="true">
<id name="id" type="int" column="id">
<generator class="increment"/>
</id>

<discriminator column="option_position_ref_id" type="int"/>

...

<subclass name="com.ameraust.investor.option.strategy.BuyWritePosition" discriminator-value="1"/>
</class>
</hibernate-mapping>

Here are the definitions of the classes:


public abstract class OptionPosition {

private int id;
...
}

public class BuyWritePosition extends OptionPosition {
...
}

When trying to save a BuyWritePosition object:

OptionPosition optionPosition = new BuyWritePosition(...);

session.save(optionPosition);

Got the following error.

It seems the error happened with the primary key -- id. No idea why.

Thanks,


14:57:47,656 ERROR BasicPropertyAccessor:167 - IllegalArgumentException in class: com.ameraust.investor.option.strategy.OptionPosition, getter method of property: id
14:57:47,656 ERROR AmeraustInvestor:53 - Error
org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of com.ameraust.investor.option.strategy.OptionPosition.id
at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:171)
at org.hibernate.engine.UnsavedValueFactory.getUnsavedIdentifierValue(UnsavedValueFactory.java:44)
at org.hibernate.tuple.PropertyFactory.buildIdentifierProperty(PropertyFactory.java:44)
at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:123)
at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:434)
at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:109)
at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:226)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1294)
at com.ameraust.investor.database.HibernateUtil.<clinit>(HibernateUtil.java:29)
at com.ameraust.investor.database.OptionPositionDBProcessor.create(OptionPositionDBProcessor.java:118)
at com.ameraust.investor.AmeraustInvestor.saveBuyWriteToDB(AmeraustInvestor.java:79)
at com.ameraust.investor.AmeraustInvestor.main(AmeraustInvestor.java:53)
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:145)
... 12 more