--- a/jdk/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicSpinnerUI.java	Tue May 10 12:15:07 2016 +0300
+++ b/jdk/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicSpinnerUI.java	Tue May 10 16:08:21 2016 +0530
@@ -210,6 +210,16 @@
         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 instanceof JSpinner.DefaultEditor) {
+            JTextField tf = ((JSpinner.DefaultEditor) editor).getTextField();
+            if (tf != null) {
+                if (tf.getFont() instanceof UIResource) {
+                    tf.setFont(new FontUIResource(spinner.getFont()));
+                }
+            }
+        }
     }
 
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/swing/JSpinner/6421058/bug6421058.java	Tue May 10 16:08:21 2016 +0530
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+ /*
+  * @test
+  * @bug 6421058
+  * @summary Verify font of the text field is changed to the font of
+  *        JSpinner if the font of text field was NOT set by the user
+  * @run main bug6421058
+  */
+
+import java.awt.Font;
+import javax.swing.JFrame;
+import javax.swing.JSpinner;
+import javax.swing.JSpinner.DefaultEditor;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.UnsupportedLookAndFeelException;
+import javax.swing.plaf.UIResource;
+import static javax.swing.UIManager.getInstalledLookAndFeels;
+
+public class bug6421058 implements Runnable {
+
+    public static void main(final String[] args) throws Exception {
+        for (final UIManager.LookAndFeelInfo laf : getInstalledLookAndFeels()) {
+            SwingUtilities.invokeAndWait(() -> setLookAndFeel(laf));
+            SwingUtilities.invokeAndWait(new bug6421058());
+        }
+    }
+
+    @Override
+    public void run() {
+        final JFrame mainFrame = new JFrame();
+        try {
+            testDefaultFont(mainFrame);
+        } finally {
+            mainFrame.dispose();
+        }
+    }
+
+    private static void testDefaultFont(final JFrame frame) {
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+        JSpinner spinner = new JSpinner();
+        frame.add(spinner);
+        frame.setSize(300, 100);
+        frame.setVisible(true);
+
+        final DefaultEditor editor = (DefaultEditor) spinner.getEditor();
+        final Font editorFont = editor.getTextField().getFont();
+
+        /*
+         * Validate that the font of the text field is changed to the
+         * font of JSpinner if the font of text field was not set by the
+         * user.
+         */
+
+        if (!(editorFont instanceof UIResource)) {
+            throw new RuntimeException("Font must be UIResource");
+        }
+        if (!editorFont.equals(spinner.getFont())) {
+            throw new RuntimeException("Wrong FONT");
+        }
+    }
+
+    private static void setLookAndFeel(final UIManager.LookAndFeelInfo laf) {
+        try {
+            UIManager.setLookAndFeel(laf.getClassName());
+        } catch (ClassNotFoundException | InstantiationException |
+                UnsupportedLookAndFeelException | IllegalAccessException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}