TIL: Hibernate JPA NamedNativeQuery declaration requires a "resultClass" even for update/delete operations

I was writing some JPA code (Hibernate implementation) that used
NamedNativeQuery

and kept getting this when I ran the webapp in Tomcat:

nested exception is org.hibernate.cfg.NotYetImplementedException: Pure
native scalar queries are not yet supported

The exception was from an unrelated class but I suspected that this
was caused by changes I made.

According to this:

http://jdevelopment.nl/hibernates-pure-native-scalar-queries-supported/

resultClass is required for all NamedNativeQuery, even the ones that
don't return them, because of a longstanding BUG in Hibernate.
Apparently the bug was fixed as of Hibernate 4.2 but we're still on
3.6 so upgrading is not really an option.