8245785: javax.swing.JTabbedPane cannot be deserialized

Reviewed-by: serb, prr, kizune

src/java.desktop/share/classes/javax/swing/JTabbedPane.java

@@ -174,7 +174,7 @@ public class JTabbedPane extends JComponent
      */
     protected ChangeListener changeListener = null;
 
-    private final java.util.List<Page> pages;
+    private java.util.List<Page> pages;
 
     /* The component that is currently visible */
     private Component visComp = null;
@@ -1827,6 +1827,7 @@ public class JTabbedPane extends JComponent
      * <code>JComponent</code> for more
      * information about serialization in Swing.
      */
+    @SuppressWarnings("unchecked")
     private void readObject(ObjectInputStream s)
         throws IOException, ClassNotFoundException
     {
@@ -1841,6 +1842,7 @@ public class JTabbedPane extends JComponent
         model = (SingleSelectionModel) f.get("model", null);
         haveRegistered = f.get("haveRegistered", false);
         changeListener = (ChangeListener) f.get("changeListener", null);
+        pages = (java.util.List<JTabbedPane.Page>) f.get("pages", null);
         visComp = (Component) f.get("visComp", null);
 
         if ((ui != null) && (getUIClassID().equals(uiClassID))) {

test/jdk/javax/swing/JTabbedPane/JTabbedPaneSerialization.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2020, 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 8245785
+ * @summary  Verifies if javax.swing.JTabbedPane can be deserialized
+ * @run main JTabbedPaneSerialization
+ */
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.IOException;
+import javax.swing.JTabbedPane;
+import javax.swing.JLabel;
+
+public class JTabbedPaneSerialization {
+
+    public static void main(final String[] args) throws Exception {
+
+        JTabbedPane tabbedPane = new JTabbedPane();
+        tabbedPane.addTab("Tab1", new JLabel("Label1"));
+        tabbedPane.addTab("Tab2", new JLabel("Label2"));
+        tabbedPane.addTab("Tab3", new JLabel("Label3"));
+
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        ObjectOutputStream out = new ObjectOutputStream(baos);
+
+        out.writeObject(tabbedPane);
+        out.close();
+
+        byte[] bytes = baos.toByteArray();
+        ByteArrayInputStream is = new ByteArrayInputStream(bytes);
+        ObjectInputStream oin = new ObjectInputStream(is);
+
+        final JTabbedPane readPane = (JTabbedPane) oin.readObject();
+        System.out.println("readPane: " + readPane.toString());
+        oin.close();
+        if (tabbedPane.getTabCount() != readPane.getTabCount()) {
+            System.out.println("tabbedPane.tabCount " +
+                                          tabbedPane.getTabCount());
+            System.out.println("readPane.tabCount " +
+                                            readPane.getTabCount());
+            throw new
+               RuntimeException("Number of pages/tab of JTabbedPane is not deserialized");
+        }
+    }
+}