6514600: AbstractAction can throw NullPointerException when clone()d

Reviewed-by: serb, pbansal

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

@@ -255,17 +255,19 @@ class ArrayTable implements Cloneable {
      */
     public Object clone() {
         ArrayTable newArrayTable = new ArrayTable();
-        if (isArray()) {
-            Object[] array = (Object[])table;
-            for (int i = 0 ;i < array.length-1 ; i+=2) {
-                newArrayTable.put(array[i], array[i+1]);
-            }
-        } else {
-            Hashtable<?,?> tmp = (Hashtable)table;
-            Enumeration<?> keys = tmp.keys();
-            while (keys.hasMoreElements()) {
-                Object o = keys.nextElement();
-                newArrayTable.put(o,tmp.get(o));
+        if (table != null) {
+            if (isArray()) {
+                Object[] array = (Object[]) table;
+                for (int i = 0; i < array.length - 1; i += 2) {
+                    newArrayTable.put(array[i], array[i + 1]);
+                }
+            } else {
+                Hashtable<?, ?> tmp = (Hashtable) table;
+                Enumeration<?> keys = tmp.keys();
+                while (keys.hasMoreElements()) {
+                    Object o = keys.nextElement();
+                    newArrayTable.put(o, tmp.get(o));
+                }
             }
         }
         return newArrayTable;

test/jdk/javax/swing/Action/AbstractActionBug.java

@@ -0,0 +1,57 @@
+/*
+ * 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 6514600
+   @summary Verifies if AbstractAction throws NullPointerException when cloned
+   @run main AbstractActionBug
+ */
+import java.awt.event.ActionEvent;
+import javax.swing.AbstractAction;
+
+public final class AbstractActionBug extends AbstractAction implements Cloneable
+{
+    public static final void main(String[] args) throws Exception
+    {
+        AbstractActionBug a1 = new AbstractActionBug("a1");
+        a1 = (AbstractActionBug) a1.clone();
+        System.out.println("a1 cloned ok");
+
+        AbstractActionBug a2 = new AbstractActionBug("a2");
+        a2.putValue(NAME, "null");
+        a2 = (AbstractActionBug) a2.clone();
+        System.out.println("a2 cloned ok");
+
+        AbstractActionBug a3 = new AbstractActionBug(null);
+        a3 = (AbstractActionBug) a3.clone();
+        System.out.println("a3 cloned ok");
+    }
+
+    private AbstractActionBug(String name) {
+        putValue(NAME, name);
+    }
+
+    public void actionPerformed(ActionEvent e)
+    {
+    }
+}