--- a/src/java.desktop/unix/native/libawt_xawt/awt/gtk3_interface.c	Wed Dec 18 10:10:32 2019 +0300
+++ b/src/java.desktop/unix/native/libawt_xawt/awt/gtk3_interface.c	Thu Dec 19 11:57:58 2019 +0530
@@ -1439,6 +1439,10 @@
                 path = createWidgetPath (fp_gtk_style_context_get_path (widget_context));
                 append_element(path, "paned");
                 append_element(path, "separator");
+            } else if (strcmp(detail, "spinbutton_down") == 0 || strcmp(detail, "spinbutton_up") == 0) {
+                path = createWidgetPath (fp_gtk_style_context_get_path (widget_context));
+                append_element(path, "spinbutton");
+                append_element(path, "button");
             } else {
                 path = createWidgetPath (fp_gtk_style_context_get_path (widget_context));
                 append_element(path, detail);

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/javax/swing/JSpinner/TestJSpinnerPressUnpress.java	Thu Dec 19 11:57:58 2019 +0530
@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2019, 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 8234733
+ * @summary Verify that JSpinner up/down button rendering is changed
+ *           according to pressed state in GTKLookAndFeel
+ * @run main/manual TestJSpinnerPressUnpress
+ */
+
+import java.awt.Color;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.Insets;
+import java.awt.event.ActionEvent;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import javax.swing.JButton;
+import javax.swing.JSpinner;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.JTextArea;
+import javax.swing.UIManager;
+import javax.swing.SwingUtilities;
+import javax.swing.UnsupportedLookAndFeelException;
+
+public class TestJSpinnerPressUnpress {
+    private static JFrame mainFrame = new JFrame();
+    private static volatile boolean testResult = false;
+    private static volatile CountDownLatch countDownLatch;
+    private static final String GTK_LAF_CLASS = "GTKLookAndFeel";
+    private static final String INSTRUCTIONS = "INSTRUCTIONS:\n\n" +
+            "Verify that when spinner up/down button is pressed to change\n" +
+            "the spinner value, the button's rendering is changed to show\n" +
+            "the pressed state. If yes, Press Pass, Otherwise, Press Fail.";
+
+    public static void main(String args[]) throws Exception {
+        if (!System.getProperty("os.name").startsWith("Linux")) {
+            System.out.println("This test is meant for Linux platform only");
+            return;
+        }
+        countDownLatch = new CountDownLatch(1);
+
+        for (UIManager.LookAndFeelInfo lookAndFeelInfo :
+                UIManager.getInstalledLookAndFeels()) {
+            if (lookAndFeelInfo.getClassName().contains(GTK_LAF_CLASS)) {
+                try {
+                    UIManager.setLookAndFeel(lookAndFeelInfo.getClassName());
+                } catch (final UnsupportedLookAndFeelException ignored) {
+                    System.out.println("GTK L&F could not be set, so this " +
+                            "test can not be run in this scenario ");
+                    return;
+                }
+            }
+        }
+        SwingUtilities.invokeLater(TestJSpinnerPressUnpress::createUI);
+        countDownLatch.await(15, TimeUnit.MINUTES);
+        SwingUtilities.invokeLater(mainFrame::dispose);
+
+        if (!testResult) {
+            throw new RuntimeException("Test failed!");
+        }
+    }
+
+    private static void createUI() {
+        GridBagLayout layout = new GridBagLayout();
+        JPanel mainControlPanel = new JPanel(layout);
+        JPanel resultButtonPanel = new JPanel(layout);
+
+        GridBagConstraints gbc = new GridBagConstraints();
+
+        gbc.gridx = 0;
+        gbc.gridy = 0;
+        gbc.insets = new Insets(5, 15, 5, 15);
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+        mainControlPanel.add(new JSpinner(), gbc);
+
+        JTextArea instructionTextArea = new JTextArea();
+        instructionTextArea.setText(INSTRUCTIONS);
+        instructionTextArea.setEditable(false);
+        instructionTextArea.setBackground(Color.white);
+
+        gbc.gridx = 0;
+        gbc.gridy = 1;
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+        mainControlPanel.add(instructionTextArea, gbc);
+
+        JButton passButton = new JButton("Pass");
+        passButton.setActionCommand("Pass");
+        passButton.addActionListener((ActionEvent e) -> {
+            testResult = true;
+            countDownLatch.countDown();
+
+        });
+
+        JButton failButton = new JButton("Fail");
+        failButton.setActionCommand("Fail");
+        failButton.addActionListener(e -> {
+            countDownLatch.countDown();
+        });
+
+        gbc.gridx = 0;
+        gbc.gridy = 0;
+
+        resultButtonPanel.add(passButton, gbc);
+
+        gbc.gridx = 1;
+        gbc.gridy = 0;
+        resultButtonPanel.add(failButton, gbc);
+
+        gbc.gridx = 0;
+        gbc.gridy = 2;
+        mainControlPanel.add(resultButtonPanel, gbc);
+
+        mainFrame.add(mainControlPanel);
+        mainFrame.pack();
+
+        mainFrame.addWindowListener(new WindowAdapter() {
+            @Override
+            public void windowClosing(WindowEvent e) {
+                mainFrame.dispose();
+                countDownLatch.countDown();
+            }
+        });
+        mainFrame.setVisible(true);
+    }
+}