Re: Problem trying to avoid N+1 selects

[Stefan Langer]

Not sure it is related to your issue but be aware that when you do a 
left outer join and you have no results for the left join you will still 
receive a row containing only nulls for your left joined object. IBatis 
will try to fill up your object with these null values. If your code for 
some reason prohibits this it will lead to errors.
See issue https://issues.apache.org/jira/browse/IBATIS-375 and please 
vote for it if you find it annoying.