The Java EE 6 Tutorial, Volume I

Constructor Expressions

Constructor expressions allow you to return Java instances that store a query result element instead of an Object[].

The following query creates a CustomerDetail instance per Customer matching the WHERE clause. A CustomerDetail stores the customer name and customer’s country name. So the query returns a List of CustomerDetail instances:

 FROM customer c
WHERE c.lastname = ’Coss’ AND c.firstname = ’Roxane’