Shrink JScroll Pane to same Height as JTable

Question

I currently have JTables nested in JScrollPanes like so:

My problem is

Answer 1

I use setPreferredScrollableViewportSize() in this context, followed by pack() or revalidate() as required.

Addendum:

How do you use it?

It's a feature of the implementation of Scrollable in JTable. Here are several examples. The complementary getPreferredScrollableViewportSize() may also be useful.