I've been reading through HiA and love it! Thanks for the excellent resource. Concerning implementing a customer UserType (or CompositeUserType) I notice that the first line in the implementation for "nullSafeGet" is:

I was surprised to see this, as "wasNull()" operates on the last value retrieved from the ResultSet, and there doesn't seem to be any documentation on the last value Hibernate would have retrieved from the ResultSet (if any) before calling "nullSafeGet" on your UserType. I couldn't even find it mentioned in HiA. So my question is, when implementing my own custom UserType, do I need to put this line in my nullSafeGet? If so, what does this line accomplish? Is there some gaurantee somewhere that Hibernate retrieves some standard field before calling nullSafeGet?

Thanks,
Anodos

Hello,

this is an obvious error in the example code, which needs to be fixed asap IMO, as it might seriously frustrate new hibernate users.

The line resultSet.wasNull() must appear AFTER the line with the getXXX, of course, as below:

BigDecimal valueInUSD = resultSet.getBigDecimal(names[0]);
if (resultSet.wasNull()) return null
else
return new MonetaryAmount(valueInUSD, Currency.getInstance)"USD"));
}

this is on page 204.
christian

This is already in the errata list.