--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/lang/ClassLoader/deadlock/DelegateTest.java	Wed Jul 26 09:20:59 2017 +0800
@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2009, 2017, 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 4735126
+ * @summary (cl) ClassLoader.loadClass locks all instances in chain when delegating
+ * @modules java.base/java.lang:open
+ *          jdk.compiler
+ * @library /test/lib
+ * @build jdk.test.lib.compiler.CompilerUtils
+ * @run main/othervm -Xlog:class+load DelegateTest one-way
+ * @run main/othervm -Xlog:class+load DelegateTest cross
+ */
+
+import java.io.File;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import jdk.test.lib.compiler.CompilerUtils;
+
+public class DelegateTest implements Runnable {
+
+    private static final Path TEST_DIR = Paths.get(System.getProperty("user.dir", "."));
+    private static final Path SRC_DIR = Paths.get(System.getProperty("test.src"), "src");
+
+    private String id;
+    private DelegatingLoader dl;
+    private String startClass;
+
+    private static DelegatingLoader saLoader, sbLoader;
+
+    public static void log(String line) {
+        System.out.println(line);
+    }
+
+    public static void main(String[] args) throws Exception {
+        if (!CompilerUtils.compile(SRC_DIR, TEST_DIR)) {
+            throw new RuntimeException("Failed to compile "
+                    + SRC_DIR.toAbsolutePath().toString());
+        }
+
+        URL[] url = new URL[1];
+        try {
+            url[0] = new URL("file://" + TEST_DIR + File.separator);
+        } catch (MalformedURLException e) {
+            e.printStackTrace();
+        }
+        // Set up Classloader delegation hierarchy
+        saLoader = new DelegatingLoader(url);
+        sbLoader = new DelegatingLoader(url);
+
+        String[] saClasses = { "comSA.SupBob", "comSA.Alice" };
+        String[] sbClasses = { "comSB.SupAlice", "comSB.Bob" };
+
+        saLoader.setDelegate(sbClasses, sbLoader);
+        sbLoader.setDelegate(saClasses, saLoader);
+
+        // test one-way delegate
+        String testType = args[0];
+        if (testType.equals("one-way")) {
+            test("comSA.Alice", "comSA.SupBob");
+        } else if (testType.equals("cross")) {
+            // test cross delegate
+            test("comSA.Alice", "comSB.Bob");
+        } else {
+            System.out.println("ERROR: unsupported - " + testType);
+        }
+    }
+
+    private static void test(String clsForSA, String clsForSB) throws InterruptedException {
+        DelegateTest ia = new DelegateTest("SA", saLoader, clsForSA);
+        DelegateTest ib = new DelegateTest("SB", sbLoader, clsForSB);
+        Thread ta = new Thread(ia);
+        Thread tb = new Thread(ib);
+        ta.start();
+        tb.start();
+        ta.join();
+        tb.join();
+    }
+
+    public static void sleep() {
+        try {
+            Thread.sleep(500);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+            log("Thread interrupted");
+        }
+    }
+
+    private DelegateTest(String id, DelegatingLoader dl, String startClass) {
+        this.id = id;
+        this.dl = dl;
+        this.startClass = startClass;
+    }
+
+    public void run() {
+        log("Spawned thread " + id + " running");
+        try {
+            // To mirror the WAS deadlock, need to ensure class load
+            // is routed via the VM.
+            Class.forName(startClass, true, dl);
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+        log("Thread " + id + " terminating");
+    }
+}