Named JPA query with wrong return type of size

Question

I have the following query:

select lect from Lecturer lect
where lect.lectures.size > :minNr

and this line from a test fills in the value for minNr:

query.setParameter("minNr", 2L);

My Problem is that I always get the following error message:

java.lang.IllegalArgumentException: Parameter value [2] did not match expected type [java.lang.Integer]

If I change the above test line to

query.setParameter("minNr", 2);

there is no problem. But I must not change the test, because it is an assignment.

Is there any way to cast the return of size to a Long? Or does count() return a value of type Long?

Hope you understand my problem.

regards

Answer 1

I've used

Select count(distinct lecture) FROM Lecture join ...

to solve this task. It works fine now.