8269225: JFR.stop misses the written info when the filename is only s…

…pecified by JFR.start

Reviewed-by: egahlin

src/jdk.jfr/share/classes/jdk/jfr/internal/dcmd/DCmdStop.java

@@ -29,7 +29,9 @@
 import java.nio.file.Paths;
 
 import jdk.jfr.Recording;
+import jdk.jfr.internal.PrivateAccess;
 import jdk.jfr.internal.SecuritySupport.SafePath;
+import jdk.jfr.internal.WriteableUserPath;
 
 /**
  * JFR.stop
@@ -44,8 +46,9 @@ protected void execute(ArgumentParser parser)  throws DCmdException {
         String name = parser.getOption("name");
         String filename = parser.getOption("filename");
         try {
-            SafePath safePath = null;
             Recording recording = findRecording(name);
+            WriteableUserPath path = PrivateAccess.getInstance().getPlatformRecording(recording).getDestination();
+            SafePath safePath = path == null ? null : new SafePath(path.getRealPathText());
             if (filename != null) {
                 try {
                     // Ensure path is valid. Don't generate safePath if filename == null, as a user may

test/jdk/jdk/jfr/jcmd/TestJcmdStopWithoutFilename.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2021, Alibaba Group Holding Limited. 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.
+ */
+
+package jdk.jfr.jcmd;
+
+import jdk.test.lib.process.OutputAnalyzer;
+
+/**
+ * @test
+ * @summary The test verifies JFR.stop
+ * @key jfr
+ * @requires vm.hasJFR
+ * @library /test/lib /test/jdk
+ * @run main/othervm jdk.jfr.jcmd.TestJcmdStopWithoutFilename
+ */
+public class TestJcmdStopWithoutFilename {
+
+    public static void main(String[] args) throws Exception {
+
+        JcmdHelper.jcmd("JFR.start name=test");
+        OutputAnalyzer output = JcmdHelper.jcmd("JFR.stop name=test");
+        output.shouldNotContain("written to");
+
+        String filename = "output.jfr";
+        JcmdHelper.jcmd("JFR.start name=test filename=" + filename);
+        output = JcmdHelper.jcmd("JFR.stop name=test");
+        output.shouldContain("written to").shouldContain(filename);
+    }
+}
+