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IIRC JPAContainer tries to do all sorting in DB, so, no. In many cases you could somehow derive these transient values with DB and still do the sorting there, but JPAContainer really isn't the tool for you then.
I actaully don't suggest anybody to use JPAContainer. It might be handy for some really simple demos, but there are really handy ways to do simple demos with a better architecture as well. If you want to take a good start with JPA and Vaadin I'd definitely suggest to watch our recent