I have a class "Timelog". This class has a property called "expense". Expense is of type "Expense". The trick is that "Expense" is an abstract class and it has 3 implementations: "Project", "Overhead", and "Maintenance".

Now I have a very simple thing to do. I need to find all the timelogs that have expense of type Maintenance. I would like to do it with the CriteriaAPI. I guess it could be done with a theta-style join but is it possible to do it with the CriteriaAPI?

thanks,

Kirill