src/java.desktop/macosx/classes/com/apple/laf/AquaSpinnerUI.java

@@ -554,10 +554,11 @@
             }
 
             if (bottom != null) {
                 fBottomModel = bottom.getModel();
             }
+            setFocusable(false);
         }
 
         @Override
         public void paint(final Graphics g) {
             if (spinner.isOpaque()) {