For some reason, the object passed to nullSafeGet is my persistent class, not the custom attribute. I'm not sure why. Any help?

Hibernate version:
3

Mapping documents:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.marsh.common.account">
<class name="CurrencyDVO" table="currency">
<id name="id" type="long" unsaved-value="null">
<generator class="native"/>
</id>
<property name="currencyName" column="NAME" type="string" length="28"/>
<property name="currencyCode" column="CODE" type="string" length="3"/>
<property name="conversionRate" column="CONVERSION_RATE" type="double"/>
<property name="conversionDate" column="CONVERSION_DATE" type="com.marsh.common.account.DayType"/>
</class>
</hibernate-mapping>

Code between sessionFactory.openSession() and session.close():
Session session = HibernateFactory.openSession();
Query q = session.createQuery("from CurrencyDVO where conversionDate = ? ");
q.setParameter(0, new Day(2006,6,27));
List results = q.list();
System.out.println("" + q);
session.flush();
HibernateFactory.close(session);
HibernateFactory.closeFactory();

Full stack trace of any exception that occurs:
Exception in thread "main" java.lang.ClassCastException: com.marsh.common.account.CurrencyDVO
at com.marsh.common.account.DayType.nullSafeGet(DayType.java:65)
at org.hibernate.type.CustomType.nullSafeGet(CustomType.java:104)
at org.hibernate.type.AbstractType.hydrate(AbstractType.java:81)
at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:1983)
at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1372)
at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1300)
at org.hibernate.loader.Loader.getRow(Loader.java:1197)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:569)
at org.hibernate.loader.Loader.doQuery(Loader.java:689)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
at org.hibernate.loader.Loader.doList(Loader.java:2145)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)
at org.hibernate.loader.Loader.list(Loader.java:2024)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:392)
at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:333)
at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1114)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
at com.marsh.common.account.ExchangeRate.main(ExchangeRate.java:39)


Name and version of the database you are using:
Oracle 10

Code for custom UserType:
/*
* Created on Jun 15, 2006
*
* Copyright 2006, Marsh
*/
package com.marsh.common.account;

import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Date;

import org.hibernate.Hibernate;
import org.hibernate.HibernateException;
import org.hibernate.usertype.UserType;

/**
* @author etrembic
*
*/
public class DayType implements UserType {
private static final int[] types = {Types.DATE};

/* (non-Javadoc)
* @see org.hibernate.usertype.UserType#sqlTypes()
*/
public int[] sqlTypes() {
return types;
}

/* (non-Javadoc)
* @see org.hibernate.usertype.UserType#returnedClass()
*/
public Class returnedClass() {
return Day.class;
}

/* (non-Javadoc)
* @see org.hibernate.usertype.UserType#equals(java.lang.Object, java.lang.Object)
*/
public boolean equals(Object arg0, Object arg1) throws HibernateException {
if (arg0 instanceof Day) {
return ((Day) arg0).equals(arg1);
}
return false;
}

/* (non-Javadoc)
* @see org.hibernate.usertype.UserType#hashCode(java.lang.Object)
*/
public int hashCode(Object arg0) throws HibernateException {
if (arg0 instanceof Day) {
return ((Day) arg0).hashCode();
}
return 0;
}

/* (non-Javadoc)
* @see org.hibernate.usertype.UserType#nullSafeGet(java.sql.ResultSet, java.lang.String[], java.lang.Object)
*/
public Object nullSafeGet(ResultSet rs, String[] names, Object o)
throws HibernateException, SQLException {
Day day = (Day) o;
day.getCalendar().setTime((Date) Hibernate.DATE.nullSafeGet(rs, names[0]));
return day;
}

/* (non-Javadoc)
* @see org.hibernate.usertype.UserType#nullSafeSet(java.sql.PreparedStatement, java.lang.Object, int)
*/
public void nullSafeSet(PreparedStatement ps, Object o, int i)
throws HibernateException, SQLException {
Day day = (Day) o;
Hibernate.DATE.nullSafeSet(ps, day.getTime(), i);
}

/* (non-Javadoc)
* @see org.hibernate.usertype.UserType#deepCopy(java.lang.Object)
*/
public Object deepCopy(Object o) throws HibernateException {
if (o == null) return null;
Day origDay = (Day) o;
Day newDay = Day.today();
newDay.getCalendar().setTime(origDay.getTime());
return newDay;
}

/* (non-Javadoc)
* @see org.hibernate.usertype.UserType#isMutable()
*/
public boolean isMutable() {
return true;
}

/* (non-Javadoc)
* @see org.hibernate.usertype.UserType#disassemble(java.lang.Object)
*/
public Serializable disassemble(Object arg0) throws HibernateException {
return (Serializable) deepCopy(arg0);
}

/* (non-Javadoc)
* @see org.hibernate.usertype.UserType#assemble(java.io.Serializable, java.lang.Object)
*/
public Object assemble(Serializable arg0, Object arg1)
throws HibernateException {
return deepCopy(arg0);
}

/* (non-Javadoc)
* @see org.hibernate.usertype.UserType#replace(java.lang.Object, java.lang.Object, java.lang.Object)
*/
public Object replace(Object arg0, Object arg1, Object arg2)
throws HibernateException {
return deepCopy(arg0);
}

}

You are confused. In nullSafeGet o is the owner - the containing entity - it's an account.

I don't know how your Day class is so I suppose that your code should be something like:


don't forget to rate

Also, I'm not sure but I think you need to implement CompositeUserType in order to use your type in HQL queries.

Thanks!!! That does it.
I was using the example on p. 152 of "Hibernate Quickly", so either I'm mis-reading it, or they didn't test it before printing it.
Cheers,
Ed