--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/vmTestbase/nsk/jdb/monitor/monitor002/monitor002.java	Tue Sep 10 09:08:52 2019 -0700
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2019, 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
+ *
+ * @summary JDB problem running monitor command
+ * VM Testbase keywords: [jpda, jdb]
+ * VM Testbase readme:
+ * DESCRIPTION
+ * Make sure 'monitor unmonitor 1' does not cause ConcurrentModificationException
+ * in the debugger.
+ * The jdb sets up line breakpoint at the debugged application. Then one command
+ * 'monitor unmonitor 1' is set. After resuming the debuggee stops at the breakpoint.
+ * The test passes if correct reply for "unmonitor 1" commanda is found in jdb stdout
+ * stream.
+ * The test consists of two program:
+ *   monitor002.java - launches jdb and debuggee, writes commands to jdb, reads the jdb output,
+ *   monitor002a.java - the debugged application.
+ *
+ * @library /vmTestbase
+ *          /test/lib
+ * @run driver jdk.test.lib.FileInstaller . .
+ * @build nsk.jdb.monitor.monitor002.monitor002
+ *        nsk.jdb.monitor.monitor002.monitor002a
+ * @run main/othervm PropertyResolvingWrapper nsk.jdb.monitor.monitor002.monitor002
+ *      -arch=${os.family}-${os.simpleArch}
+ *      -waittime=5
+ *      -debugee.vmkind=java
+ *      -transport.address=dynamic
+ *      -jdb=${test.jdk}/bin/jdb
+ *      -java.options="${test.vm.opts} ${test.java.opts}"
+ *      -workdir=.
+ *      -debugee.vmkeys="${test.vm.opts} ${test.java.opts}"
+ */
+
+package nsk.jdb.monitor.monitor002;
+
+import nsk.share.*;
+import nsk.share.jdb.*;
+
+import java.io.*;
+import java.util.*;
+
+public class monitor002 extends JdbTest {
+
+    public static void main (String argv[]) {
+        System.exit(run(argv, System.out) + JCK_STATUS_BASE);
+    }
+
+    public static int run(String argv[], PrintStream out) {
+        debuggeeClass =  DEBUGGEE_CLASS;
+        firstBreak = FIRST_BREAK;
+        lastBreak = LAST_BREAK;
+        return new monitor002().runTest(argv, out);
+    }
+
+    static final String PACKAGE_NAME = "nsk.jdb.monitor.monitor002";
+    static final String TEST_CLASS = PACKAGE_NAME + ".monitor002";
+    static final String DEBUGGEE_CLASS = TEST_CLASS + "a";
+    static final String FIRST_BREAK        = DEBUGGEE_CLASS + ".main";
+    static final String LAST_BREAK         = DEBUGGEE_CLASS + ".lastBreak";
+    static final int    LINE_NUMBER        = 47;
+
+    static final String[] CHECKED_COMMANDS = {
+        JdbCommand.unmonitor + "1"
+                                             };
+
+    protected void runCases() {
+        String[] reply;
+        Paragrep grep;
+        int count;
+        Vector v;
+        String found;
+
+        reply = jdb.receiveReplyFor(JdbCommand.stop_at + DEBUGGEE_CLASS + ":" + LINE_NUMBER);
+
+        for (int i = 0; i < CHECKED_COMMANDS.length; i++) {
+            reply = jdb.receiveReplyFor(JdbCommand.monitor + CHECKED_COMMANDS[i]);
+        }
+
+        int repliesCount = CHECKED_COMMANDS.length + 1;
+        reply = jdb.receiveReplyFor(JdbCommand.cont, true, repliesCount);
+
+        reply = jdb.receiveReplyFor(JdbCommand.monitor);
+        if (reply.length != 1) {
+            log.complain("Expected no active monitors after exectuting monitored command: " + CHECKED_COMMANDS[0]);
+            success = false;
+        }
+
+        jdb.contToExit(1);
+
+        reply = jdb.getTotalReply();
+
+        if (!checkCommands(reply)) {
+            success = false;
+        }
+    }
+
+    private boolean checkCommands(String[] reply) {
+        Paragrep grep;
+        boolean result = true;
+        int count;
+
+        grep = new Paragrep(reply);
+
+        if ((count = grep.find("Unmonitoring 1:  unmonitor 1")) != 1) {
+            log.complain("Wrong number of execution of monitored command: " + CHECKED_COMMANDS[0]);
+            log.complain("    Expected: 1; found: " + count);
+            result = false;
+        }
+
+        return result;
+    }
+}