--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/sun/tools/jhsdb/AlternateHashingTest.java	Wed Apr 26 15:01:43 2017 +0530
@@ -0,0 +1,128 @@
+/*
+ * Copyright (c) 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 8030750
+ * @summary Test alternate hashing of strings in Serviceability Agent.
+ * @library /test/lib
+ * @library /lib/testlibrary
+ * @compile AlternateHashingTest.java
+ * @run main/timeout=240 AlternateHashingTest
+ */
+
+import java.io.BufferedReader;
+import java.io.OutputStream;
+import java.io.InputStreamReader;
+import java.io.IOException;
+import java.util.Arrays;
+import jdk.testlibrary.JDKToolLauncher;
+import jdk.test.lib.apps.LingeredApp;
+import jdk.test.lib.Platform;
+
+public class AlternateHashingTest {
+
+    private static LingeredAppWithAltHashing theApp = null;
+
+    /**
+     *
+     * @param vmArgs  - tool arguments to launch jhsdb
+     * @return exit code of tool
+     */
+    public static void launch(String expectedMessage, String cmd) throws IOException {
+
+        System.out.println("Starting LingeredApp");
+        try {
+            theApp = new LingeredAppWithAltHashing();
+            LingeredApp.startApp(Arrays.asList("-Xmx256m"), theApp);
+
+            System.out.println("Starting clhsdb against " + theApp.getPid());
+            JDKToolLauncher launcher = JDKToolLauncher.createUsingTestJDK("jhsdb");
+            launcher.addToolArg("clhsdb");
+            launcher.addToolArg("--pid=" + Long.toString(theApp.getPid()));
+
+            ProcessBuilder processBuilder = new ProcessBuilder(launcher.getCommand());
+            processBuilder.redirectError(ProcessBuilder.Redirect.INHERIT);
+            Process toolProcess = processBuilder.start();
+
+            try (OutputStream out = toolProcess.getOutputStream()) {
+                out.write(cmd.getBytes());
+                out.write("quit\n".getBytes());
+            }
+
+            boolean result = false;
+            try (BufferedReader reader =
+                 new BufferedReader(new InputStreamReader(toolProcess.getInputStream()))) {
+                String line;
+
+                while ((line = reader.readLine()) != null) {
+                    line = line.trim();
+                    System.out.println(line);
+
+                    if (line.contains(expectedMessage)) {
+                        result = true;
+                        break;
+                    }
+                }
+            }
+
+            toolProcess.waitFor();
+
+            if (toolProcess.exitValue() != 0) {
+                throw new RuntimeException("FAILED CLHSDB terminated with non-zero exit code " + toolProcess.exitValue());
+            }
+
+            if (!result) {
+                throw new RuntimeException(cmd + " command output is missing the message " + expectedMessage);
+            }
+
+        } catch (Exception ex) {
+            throw new RuntimeException("Test ERROR " + ex, ex);
+        } finally {
+            LingeredApp.stopApp(theApp);
+        }
+    }
+
+
+    public static void testAltHashing() throws IOException {
+
+        launch("Stack in use by Java", "threads\n");
+    }
+
+    public static void main(String[] args) throws Exception {
+
+        if (!Platform.shouldSAAttach()) {
+            // Silently skip the test if we don't have enough permissions to attach
+            System.err.println("Error! Insufficient permissions to attach - test skipped.");
+            return;
+        }
+
+
+        testAltHashing();
+
+        // The test throws RuntimeException on error.
+        // IOException is thrown if LingeredApp can't start because of some bad
+        // environment condition
+        System.out.println("Test PASSED");
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/sun/tools/jhsdb/LingeredAppWithAltHashing.java	Wed Apr 26 15:01:43 2017 +0530
@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 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.
+ */
+import jdk.test.lib.apps.LingeredApp;
+
+public class LingeredAppWithAltHashing extends LingeredApp {
+
+    public static void main(String args[]) {
+        LingeredApp.main(args);
+    }
+
+    // Following strings generate the same hashcode
+
+    static final String str1 = "AaAaAaAaAaAaAa";
+    static final String str2 = "AaAaAaAaAaAaBB";
+    static final String str3 = "AaAaAaAaAaBBAa";
+    static final String str4 = "AaAaAaAaAaBBBB";
+    static final String str5 = "AaAaAaAaBBAaAa";
+    static final String str6 = "AaAaAaAaBBAaBB";
+    static final String str7 = "AaAaAaAaBBBBAa";
+    static final String str8 = "AaAaAaAaBBBBBB";
+    static final String str9 = "AaAaAaBBAaAaAa";
+    static final String str10 = "AaAaAaBBAaAaBB";
+    static final String str11 = "AaAaAaBBAaBBAa";
+    static final String str12 = "AaAaAaBBAaBBBB";
+    static final String str13 = "AaAaAaBBBBAaAa";
+    static final String str14 = "AaAaAaBBBBAaBB";
+    static final String str15 = "AaAaAaBBBBBBAa";
+    static final String str16 = "AaAaAaBBBBBBBB";
+    static final String str17 = "AaAaBBAaAaAaAa";
+    static final String str18 = "AaAaBBAaAaAaBB";
+    static final String str19 = "AaAaBBAaAaBBAa";
+    static final String str20 = "AaAaBBAaAaBBBB";
+    static final String str21 = "AaAaBBAaBBAaAa";
+    static final String str22 = "AaAaBBAaBBAaBB";
+    static final String str23 = "AaAaBBAaBBBBAa";
+    static final String str24 = "AaAaBBAaBBBBBB";
+    static final String str25 = "AaAaBBBBAaAaAa";
+    static final String str26 = "AaAaBBBBAaAaBB";
+    static final String str27 = "AaAaBBBBAaBBAa";
+    static final String str28 = "AaAaBBBBAaBBBB";
+    static final String str29 = "AaAaBBBBBBAaAa";
+    static final String str30 = "AaAaBBBBBBAaBB";
+    static final String str31 = "AaAaBBBBBBBBAa";
+    static final String str32 = "AaAaBBBBBBBBBB";
+    static final String str33 = "AaBBAaAaAaAaAa";
+    static final String str34 = "AaBBAaAaAaAaBB";
+    static final String str35 = "AaBBAaAaAaBBAa";
+    static final String str36 = "AaBBAaAaAaBBBB";
+    static final String str37 = "AaBBAaAaBBAaAa";
+    static final String str38 = "AaBBAaAaBBAaBB";
+    static final String str39 = "AaBBAaAaBBBBAa";
+    static final String str40 = "AaBBAaAaBBBBBB";
+    static final String str41 = "AaBBAaBBAaAaAa";
+    static final String str42 = "AaBBAaBBAaAaBB";
+    static final String str43 = "AaBBAaBBAaBBAa";
+    static final String str44 = "AaBBAaBBAaBBBB";
+    static final String str45 = "AaBBAaBBBBAaAa";
+    static final String str46 = "AaBBAaBBBBAaBB";
+    static final String str47 = "AaBBAaBBBBBBAa";
+    static final String str48 = "AaBBAaBBBBBBBB";
+    static final String str49 = "AaBBBBAaAaAaAa";
+    static final String str50 = "AaBBBBAaAaAaBB";
+    static final String str51 = "AaBBBBAaAaBBAa";
+    static final String str52 = "AaBBBBAaAaBBBB";
+    static final String str53 = "AaBBBBAaBBAaAa";
+    static final String str54 = "AaBBBBAaBBAaBB";
+    static final String str55 = "AaBBBBAaBBBBAa";
+    static final String str56 = "AaBBBBAaBBBBBB";
+    static final String str57 = "AaBBBBBBAaAaAa";
+    static final String str58 = "AaBBBBBBAaAaBB";
+    static final String str59 = "AaBBBBBBAaBBAa";
+    static final String str60 = "AaBBBBBBAaBBBB";
+    static final String str61 = "AaBBBBBBBBAaAa";
+    static final String str62 = "AaBBBBBBBBAaBB";
+    static final String str63 = "AaBBBBBBBBBBAa";
+    static final String str64 = "AaBBBBBBBBBBBB";
+    static final String str65 = "BBAaAaAaAaAaAa";
+    static final String str66 = "BBAaAaAaAaAaBB";
+    static final String str67 = "BBAaAaAaAaBBAa";
+    static final String str68 = "BBAaAaAaAaBBBB";
+    static final String str69 = "BBAaAaAaBBAaAa";
+    static final String str70 = "BBAaAaAaBBAaBB";
+    static final String str71 = "BBAaAaAaBBBBAa";
+    static final String str72 = "BBAaAaAaBBBBBB";
+    static final String str73 = "BBAaAaBBAaAaAa";
+    static final String str74 = "BBAaAaBBAaAaBB";
+    static final String str75 = "BBAaAaBBAaBBAa";
+    static final String str76 = "BBAaAaBBAaBBBB";
+    static final String str77 = "BBAaAaBBBBAaAa";
+    static final String str78 = "BBAaAaBBBBAaBB";
+    static final String str79 = "BBAaAaBBBBBBAa";
+    static final String str80 = "BBAaAaBBBBBBBB";
+    static final String str81 = "BBAaBBAaAaAaAa";
+    static final String str82 = "BBAaBBAaAaAaBB";
+    static final String str83 = "BBAaBBAaAaBBAa";
+    static final String str84 = "BBAaBBAaAaBBBB";
+    static final String str85 = "BBAaBBAaBBAaAa";
+    static final String str86 = "BBAaBBAaBBAaBB";
+    static final String str87 = "BBAaBBAaBBBBAa";
+    static final String str88 = "BBAaBBAaBBBBBB";
+    static final String str89 = "BBAaBBBBAaAaAa";
+    static final String str90 = "BBAaBBBBAaAaBB";
+    static final String str91 = "BBAaBBBBAaBBAa";
+    static final String str92 = "BBAaBBBBAaBBBB";
+    static final String str93 = "BBAaBBBBBBAaAa";
+    static final String str94 = "BBAaBBBBBBAaBB";
+    static final String str95 = "BBAaBBBBBBBBAa";
+    static final String str96 = "BBAaBBBBBBBBBB";
+    static final String str97 = "BBBBAaAaAaAaAa";
+    static final String str98 = "BBBBAaAaAaAaBB";
+    static final String str99 = "BBBBAaAaAaBBAa";
+    static final String str100 = "BBBBAaAaAaBBBB";
+    static final String str101 = "BBBBAaAaBBAaAa";
+    static final String str102 = "BBBBAaAaBBAaBB";
+    static final String str103 = "BBBBAaAaBBBBAa";
+    static final String str104 = "BBBBAaAaBBBBBB";
+    static final String str105 = "BBBBAaBBAaAaAa";
+    static final String str106 = "BBBBAaBBAaAaBB";
+    static final String str107 = "BBBBAaBBAaBBAa";
+    static final String str108 = "BBBBAaBBAaBBBB";
+    static final String str109 = "BBBBAaBBBBAaAa";
+    static final String str110 = "BBBBAaBBBBAaBB";
+    static final String str111 = "BBBBAaBBBBBBAa";
+    static final String str112 = "BBBBAaBBBBBBBB";
+    static final String str113 = "BBBBBBAaAaAaAa";
+    static final String str114 = "BBBBBBAaAaAaBB";
+    static final String str115 = "BBBBBBAaAaBBAa";
+    static final String str116 = "BBBBBBAaAaBBBB";
+    static final String str117 = "BBBBBBAaBBAaAa";
+    static final String str118 = "BBBBBBAaBBAaBB";
+    static final String str119 = "BBBBBBAaBBBBAa";
+    static final String str120 = "BBBBBBAaBBBBBB";
+    static final String str121 = "BBBBBBBBAaAaAa";
+    static final String str122 = "BBBBBBBBAaAaBB";
+    static final String str123 = "BBBBBBBBAaBBAa";
+    static final String str124 = "BBBBBBBBAaBBBB";
+    static final String str125 = "BBBBBBBBBBAaAa";
+    static final String str126 = "BBBBBBBBBBAaBB";
+    static final String str127 = "BBBBBBBBBBBBAa";
+    static final String str128 = "BBBBBBBBBBBBBB";
+ }