--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/security/Security/ClassLoaderDeadlock/ClassLoaderDeadlock.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,91 @@
+/*
+ * Copyright 2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+// See bug 5094825 / ClassLoadDeadlock.sh
+
+import java.net.*;
+
+import java.security.*;
+
+public class ClassLoaderDeadlock {
+
+    public static void main(String[] args) throws Exception {
+        // create a new classloader
+        URL url = new URL("file:provider/");
+        final DelayClassLoader cl = new DelayClassLoader(url);
+
+        // install a provider on the custom class loader as the most prefered provider
+        Class clazz = cl.loadClass("HashProvider");
+        Provider p = (Provider)clazz.newInstance();
+        Security.insertProviderAt(p, 1);
+
+        // add a delay in class loading for reproducability
+        cl.delay = 1000;
+
+        new Thread() {
+            public void run() {
+                try {
+                    // load a random system class
+                    // this locks the DelayClassLoader and after the delay the system class loader
+                    Class c1 = cl.loadClass("java.lang.String");
+                    System.out.println(c1);
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+            }
+        }.start();
+
+        // make sure the other thread got a chance to run and grab the lock
+        Thread.sleep(200);
+
+        // load a random class from a signed JAR file to trigger JAR signature verification
+        // locks system class loader first and then tries to lock DelayClassLoader to load the hashes
+        // DEADLOCK HAPPENS HERE
+        Class c2 = Class.forName("com.abc.Tst1");
+
+        // NOT REACHED
+        System.out.println(c2);
+
+        System.out.println("OK");
+    }
+
+    static class DelayClassLoader extends URLClassLoader {
+
+        volatile int delay;
+
+        DelayClassLoader(URL url) {
+            super(new URL[] {url});
+        }
+
+        protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
+            System.out.println("-loadClass(" + name + "," + resolve + ")");
+            try {
+                // delay so that we hold the lock for a longer period
+                // makes it much easier to reproduce
+                Thread.sleep(delay);
+            } catch (InterruptedException e) { e.printStackTrace(); }
+            return super.loadClass(name, resolve);
+        }
+    }
+
+}