7180976: Pending String deadlocks UIDefaults

Reviewed-by: azvegint, alexsch

src/share/classes/javax/swing/UIDefaults.java

@@ -44,9 +44,7 @@ import java.awt.Font;
 import java.awt.Color;
 import java.awt.Insets;
 import java.awt.Dimension;
-import java.lang.reflect.Method;
 import java.beans.PropertyChangeListener;
-import java.beans.PropertyChangeEvent;
 import java.security.AccessController;
 import java.security.AccessControlContext;
 import java.security.PrivilegedAction;
@@ -74,7 +72,7 @@ import sun.util.CoreResourceBundleControl;
  */
 public class UIDefaults extends Hashtable<Object,Object>
 {
-    private static final Object PENDING = "Pending";
+    private static final Object PENDING = new Object();
 
     private SwingPropertyChangeSupport changeSupport;
 
@@ -168,7 +166,7 @@ public class UIDefaults extends Hashtable<Object,Object>
      * Looks up up the given key in our Hashtable and resolves LazyValues
      * or ActiveValues.
      */
-    private Object getFromHashtable(Object key) {
+    private Object getFromHashtable(final Object key) {
         /* Quickly handle the common case, without grabbing
          * a lock.
          */

src/share/classes/sun/swing/plaf/synth/DefaultSynthStyle.java

@@ -28,7 +28,6 @@ import javax.swing.plaf.synth.*;
 import java.awt.*;
 import java.util.*;
 import javax.swing.*;
-import javax.swing.border.Border;
 import javax.swing.plaf.*;
 
 /**
@@ -44,7 +43,8 @@ import javax.swing.plaf.*;
  * @author Scott Violet
  */
 public class DefaultSynthStyle extends SynthStyle implements Cloneable {
-    private static final String PENDING = "Pending";
+
+    private static final Object PENDING = new Object();
 
     /**
      * Should the component be opaque?

test/javax/swing/UIDefaults/7180976/Pending.java

+/*
+ * Copyright (c) 2014, 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.
+ */
+
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+
+/**
+ * @test
+ * @bug 7180976
+ * @author Sergey Bylokhov
+ */
+public final class Pending implements Runnable {
+
+    private static volatile boolean passed;
+
+    public static void main(final String[] args) throws Exception {
+        SwingUtilities.invokeLater(new Pending());
+        Thread.sleep(10000);
+        if (!passed) {
+            throw new RuntimeException("Test failed");
+        }
+    }
+
+    @Override
+    public void run() {
+        UIManager.put("foobar", "Pending");
+        UIManager.get("foobar");
+        passed = true;
+    }
+}
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