--- a/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/CommandProcessor.java	Tue Jan 09 13:58:30 2018 -0500
+++ b/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/CommandProcessor.java	Thu Jan 11 11:35:35 2018 +0530
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2018, 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
@@ -1607,7 +1607,9 @@
                             if (!all) return;
                         }
                     }
-                    out.println("Couldn't find thread " + name);
+                    if (!all) {
+                        out.println("Couldn't find thread " + name);
+                    }
                 }
             }
         },

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/serviceability/sa/ClhsdbThread.java	Thu Jan 11 11:35:35 2018 +0530
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2018, 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.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import jdk.test.lib.apps.LingeredApp;
+
+/*
+ * @test
+ * @bug 8193352
+ * @summary Test clhsdb 'thread' and 'threads' commands
+ * @library /test/lib
+ * @run main/othervm ClhsdbThread
+ */
+
+public class ClhsdbThread {
+
+    public static void main(String[] args) throws Exception {
+        System.out.println("Starting ClhsdbThread test");
+
+        LingeredApp theApp = null;
+        try {
+            ClhsdbLauncher test = new ClhsdbLauncher();
+            theApp = LingeredApp.startApp();
+            System.out.println("Started LingeredApp with pid " + theApp.getPid());
+
+            List<String> cmds = List.of("thread", "thread -a", "threads");
+
+            Map<String, List<String>> expStrMap = new HashMap<>();
+            // Check for the presence of the usage string
+            expStrMap.put("thread", List.of( "Usage: thread { -a | id }"));
+            expStrMap.put("thread -a", List.of(
+                "State: BLOCKED",
+                "Stack in use by Java",
+                "Base of Stack",
+                "Last_Java_SP:",
+                "Address"));
+            expStrMap.put("threads", List.of(
+                "Finalizer",
+                "Signal Dispatcher",
+                "Common-Cleaner",
+                "Stack in use by Java:",
+                "State:",
+                "Base of Stack:",
+                "main"));
+            Map<String, List<String>> unExpStrMap = new HashMap<>();
+            unExpStrMap.put(
+                "thread -a",
+                List.of("Couldn't find thread -a"));
+
+            String consolidatedOutput = test.run(
+                theApp.getPid(),
+                cmds,
+                expStrMap,
+                unExpStrMap);
+
+            if (consolidatedOutput == null) {
+                // Output could be null due to attach permission issues.
+                System.out.println(
+                    "Output is empty. Probably due to attach permission issues.");
+                LingeredApp.stopApp(theApp);
+                return;
+            }
+
+            // Test the thread <id> command now. Obtain <id> from the
+            // output of the previous 'threads' command. The word before
+            // the token 'Finalizer' should denote the thread id of the
+            // 'Finalizer' thread.
+
+            String[] snippets = consolidatedOutput.split("Finalizer");
+            String[] wordTokens = snippets[0].split(" ");
+            String threadIdObtained = wordTokens[wordTokens.length - 1];
+
+            // Weed out newlines and blurb before that.
+            if (threadIdObtained.contains("\n")) {
+                String[] threadIdTokens = threadIdObtained.split("\n");
+                threadIdObtained = threadIdTokens[threadIdTokens.length - 1];
+            }
+
+            expStrMap = new HashMap<>();
+            System.out.println("Thread Id obtained is: " + threadIdObtained);
+
+            String cmd = "thread " + threadIdObtained;
+            expStrMap.put(cmd, List.of(
+                "Base of Stack:",
+                "State:",
+                "Last_Java_SP"));
+            cmds = List.of(cmd);
+            test.run(theApp.getPid(), cmds, expStrMap, null);
+        } catch (Exception ex) {
+            throw new RuntimeException("Test ERROR " + ex, ex);
+        } finally {
+            LingeredApp.stopApp(theApp);
+        }
+        System.out.println("Test PASSED");
+    }
+}