src/java.desktop/share/classes/javax/swing/plaf/basic/BasicSpinnerUI.java

*** 208,217 ****
--- 208,227 ----
      protected void installDefaults() {
          spinner.setLayout(createLayout());
          LookAndFeel.installBorder(spinner, "Spinner.border");
          LookAndFeel.installColorsAndFont(spinner, "Spinner.background", "Spinner.foreground", "Spinner.font");
          LookAndFeel.installProperty(spinner, "opaque", Boolean.TRUE);
+ 
+         JComponent editor = spinner.getEditor();
+         if (editor != null && editor instanceof JSpinner.DefaultEditor) {
+             JTextField tf = ((JSpinner.DefaultEditor) editor).getTextField();
+             if (tf != null) {
+                 if (tf.getFont() instanceof UIResource) {
+                     tf.setFont(new FontUIResource(spinner.getFont()));
+                 }
+             }
+         }
      }
  
  
      /**
       * Sets the <code>JSpinner's</code> layout manager to null.  This