--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/swing/plaf/metal/MetalUtils/bug6190373.java	Wed Oct 28 15:41:42 2015 +0300
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2005, 2015, 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 java.awt.Graphics;
+import java.awt.image.BufferedImage;
+import java.util.concurrent.CyclicBarrier;
+
+import javax.swing.JButton;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.UnsupportedLookAndFeelException;
+
+import sun.awt.AppContext;
+import sun.awt.SunToolkit;
+
+import static javax.swing.UIManager.getInstalledLookAndFeels;
+
+/**
+ * @test
+ * @bug 6190373
+ * @summary Tests 6190373
+ * @author Scott Violet
+ * @modules java.desktop/sun.awt
+ */
+public final class bug6190373 {
+
+    private static AppContext app1;
+    private static AppContext app2;
+    private static final int LOOP_COUNT = 10000;
+    private static final CyclicBarrier barrier = new CyclicBarrier(2);
+
+    public static void main(final String[] args) throws Exception {
+        final Thread t1 = new Thread(new ThreadGroup("firstGroup"), () -> {
+            app1 = SunToolkit.createNewAppContext();
+            test(true);
+        });
+        final Thread t2 = new Thread(new ThreadGroup("secondGroup"), () -> {
+            app2 = SunToolkit.createNewAppContext();
+            test(false);
+        });
+
+        t1.start();
+        t2.start();
+        t1.join();
+        t2.join();
+        app1.dispose();
+        app2.dispose();
+    }
+
+    private static void test(final boolean lock) {
+        for (final UIManager.LookAndFeelInfo laf : getInstalledLookAndFeels()) {
+            try {
+                SwingUtilities.invokeAndWait(() -> setLookAndFeel(laf));
+                barrier.await();
+                SwingUtilities.invokeAndWait(() -> slam(lock));
+                barrier.await();
+            } catch (final Exception e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+    private static void slam(final boolean lock) {
+        JButton button = new JButton("HI");
+        button.setSize(100, 100);
+        BufferedImage image = new BufferedImage(100, 100,
+                                                BufferedImage.TYPE_INT_RGB);
+        for (int i = 0; i < LOOP_COUNT; i++) {
+            Graphics g = image.getGraphics();
+            if (lock) {
+                synchronized (button.getTreeLock()) {
+                    button.paint(g);
+                }
+            } else {
+                button.paint(g);
+            }
+            g.dispose();
+        }
+    }
+
+    private static void setLookAndFeel(final UIManager.LookAndFeelInfo laf) {
+        try {
+            UIManager.setLookAndFeel(laf.getClassName());
+            System.out.println("LookAndFeel: " + laf.getClassName());
+        } catch (ClassNotFoundException | InstantiationException |
+                UnsupportedLookAndFeelException | IllegalAccessException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}