IllegalArgumentException when using Constructor expression in Named Query.

Question

I have the following JPQL-query:
SELECT NEW se.callista.test.dto.EmployeeReportData(e.firstName, e.lastName, a.city, e.employmentPeriod.startDate) FROM Employee e JOIN e.address a ORDER BY e.lastName, e.firstNamewhere EmployeeReportData is a dto (not an entity). The query works fine when running it as a normal query. When I put it as a named query however, I get the following error message when trying to execute it: java.lang.IllegalArgumentException: Object: se.callista.test.dto.EmployeeReportData@10f9644 is not a known entity type.
I can't find anything in the JPA-spec that says a named query cannot contain a constructor expression - am I missing something?
Found the error. It works fine now :)
Message was edited by:
Sofia_Jonsson

Answer 1

I had the same problem.
It seems that the Entity class is not loaded by the JVM at the moment of calling createNamedQuerey(string).
I've solved this problem by loading the entity class manually in the caller by calling "Class.forName(string)" and passing the entity's class name as a parameter.