diff -r 50b3f2982b59 -r de0c1d3ed1c5 jdk/test/javax/swing/text/AbstractDocument/7146146/bug7146146.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/swing/text/AbstractDocument/7146146/bug7146146.java	Tue Apr 10 18:53:15 2012 +0300
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2012, 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 7146146
+   @summary Deadlock between subclass of AbstractDocument and UndoManager
+   @author Pavel Porvatov
+*/
+
+import javax.swing.text.BadLocationException;
+import javax.swing.text.PlainDocument;
+import javax.swing.text.StringContent;
+import javax.swing.undo.UndoManager;
+
+public class bug7146146 {
+    public static void main(String[] args) throws Exception {
+        for (int i = 0; i < 1000; i++) {
+            System.out.print("Iteration " + i);
+
+            test();
+
+            System.out.print(" passed");
+        }
+    }
+
+    private static void test() throws Exception {
+        final PlainDocument doc = new PlainDocument(new StringContent());
+        final UndoManager undoManager = new UndoManager();
+
+        doc.addUndoableEditListener(undoManager);
+        doc.insertString(0, "<Test 1>", null);
+
+        Thread t1 = new Thread("Thread 1") {
+            @Override
+            public void run() {
+                try {
+                    doc.insertString(0, "<Test 2>", null);
+                } catch (BadLocationException e) {
+                    throw new RuntimeException(e);
+                }
+            }
+        };
+
+        Thread t2 = new Thread("Thread 2") {
+            @Override
+            public void run() {
+                undoManager.undo();
+            }
+        };
+
+        t1.start();
+        t2.start();
+
+        t1.join();
+        t2.join();
+    }
+}