Running Swing tests for the PIT of jdk9 b67, I observe on Windows new behavior, perhaps regression after JDK-5036022 : buttons of JSpinner seems too big for the control and parts of them are cut out.
The previous b66 works OK. LaF seems to be Windows.

Test is Swing_AllComponents/Automated/LAF_OrientationSuite/JSpinner_WEEK_MNTH_Test

Rerunning it from ResultsDir, I printed font details from setComponentFont: it is always Dialog plain 12pt.