--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/sun/management/jdp/DynamicLauncher.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2013, 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.testlibrary.OutputAnalyzer;
+import jdk.testlibrary.ProcessTools;
+import jdk.testlibrary.Utils;
+
+import java.util.UUID;
+
+
+/**
+ * This class will try to find an unused port and run a JdpTestCase using it.
+ * The unused port is needed for jmxremote.port.
+ * The problem with busy ports arises when running many automated tests on the same host.
+ * Note that jdp.port is a multicast port and thus it can be binded by different processes at the same time.
+ */
+public abstract class DynamicLauncher {
+
+    final String jdpName = UUID.randomUUID().toString();
+    OutputAnalyzer output;
+    int jmxPort;
+
+    protected void run() throws Exception {
+        int retries = 1;
+        boolean tryAgain;
+
+        do {
+            tryAgain = false;
+            jmxPort = Utils.getFreePort();
+            output = runVM();
+            try {
+                output.shouldNotContain("Port already in use");
+            } catch (RuntimeException e) {
+                if (retries < 3) {
+                    retries++;
+                    tryAgain = true;
+                }
+            }
+        } while (tryAgain);
+        output.shouldHaveExitValue(0);
+        // java.lang.Exception is thrown by JdpTestCase if something goes wrong
+        // for instance - see JdpTestCase::shutdown()
+        output.shouldNotContain("java.lang.Exception:");
+        output.shouldNotContain("Error: Could not find or load main class");
+    }
+
+    protected OutputAnalyzer runVM() throws Exception {
+        String[] options = this.options();
+        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(options);
+        OutputAnalyzer out = ProcessTools.executeProcess(pb);
+        System.out.println(out.getStdout());
+        System.err.println(out.getStderr());
+        return out;
+    }
+
+    protected abstract String[] options();
+
+    protected OutputAnalyzer getProcessOutpoutAnalyzer() {
+        return output;
+    }
+}