--- /dev/null	2018-06-17 23:18:20.806999507 +0800
+++ new/test/jdk/jfr/cmd/TestPrintJSON.java	2019-01-29 11:02:29.579602989 +0800
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2016, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.cmd;
+
+import java.nio.file.Path;
+
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineManager;
+
+import jdk.jfr.ValueDescriptor;
+import jdk.jfr.consumer.RecordedEvent;
+import jdk.jfr.consumer.RecordedObject;
+import jdk.jfr.consumer.RecordingFile;
+import jdk.nashorn.api.scripting.JSObject;
+import jdk.testlibrary.Asserts;
+import jdk.testlibrary.OutputAnalyzer;
+import jdk.testlibrary.jfr.ExecuteHelper;
+
+/*
+ * @test
+ * @key jfr
+ * @summary Tests print --json
+ *
+ * @library /lib/testlibrary
+ * @modules jdk.scripting.nashorn
+ *          jdk.jfr
+ *
+ * @run main/othervm jdk.jfr.cmd.TestPrintJSON
+ */
+public class TestPrintJSON {
+
+    public static void main(String... args) throws Exception {
+
+        Path recordingFile = ExecuteHelper.createProfilingRecording().toAbsolutePath();
+
+        OutputAnalyzer output = ExecuteHelper.run("print", "--json", recordingFile.toString());
+        String json = output.getStdout();
+
+        // Parse JSON using Nashorn
+        String statement = "var jsonObject = " + json;
+        ScriptEngineManager factory = new ScriptEngineManager();
+        ScriptEngine engine = factory.getEngineByName("nashorn");
+        engine.eval(statement);
+        JSObject o = (JSObject) engine.get("jsonObject");
+        JSObject recording = (JSObject) o.getMember("recording");
+        JSObject events = (JSObject) recording.getMember("events");
+
+        // Verify events are equal
+        try (RecordingFile rf = new RecordingFile(recordingFile)) {
+            for (Object jsonEvent : events.values()) {
+                RecordedEvent recordedEvent = rf.readEvent();
+                double typeId = recordedEvent.getEventType().getId();
+                String startTime = recordedEvent.getStartTime().toString();
+                String duration = recordedEvent.getDuration().toString();
+                Asserts.assertEquals(typeId, ((Number) ((JSObject) jsonEvent).getMember("typeId")).doubleValue());
+                Asserts.assertEquals(startTime, ((JSObject) jsonEvent).getMember("startTime"));
+                Asserts.assertEquals(duration, ((JSObject) jsonEvent).getMember("duration"));
+                assertEquals(jsonEvent, recordedEvent);
+            }
+            Asserts.assertFalse(rf.hasMoreEvents(), "Incorrect number of events");
+        }
+    }
+
+    private static void assertEquals(Object jsonObject, Object jfrObject) throws Exception {
+        // Check object
+        if (jfrObject instanceof RecordedObject) {
+            JSObject values = (JSObject) ((JSObject) jsonObject).getMember("values");
+            RecordedObject recObject = (RecordedObject) jfrObject;
+            Asserts.assertEquals(values.values().size(), recObject.getFields().size());
+            for (ValueDescriptor v : recObject.getFields()) {
+                String name = v.getName();
+                assertEquals(values.getMember(name), recObject.getValue(name));
+                return;
+            }
+        }
+        // Check array
+        if (jfrObject != null && jfrObject.getClass().isArray()) {
+            Object[] jfrArray = (Object[]) jfrObject;
+            JSObject jsArray = (JSObject) jsonObject;
+            for (int i = 0; i < jfrArray.length; i++) {
+                assertEquals(jsArray.getSlot(i), jfrArray[i]);
+            }
+            return;
+        }
+        String jsonText = String.valueOf(jsonObject);
+        // Double.NaN / Double.Inifinity is not supported by JSON format,
+        // use null
+        if (jfrObject instanceof Double) {
+            double expected = ((Double) jfrObject);
+            if (Double.isInfinite(expected) || Double.isNaN(expected)) {
+                Asserts.assertEquals("null", jsonText);
+                return;
+            }
+            double value = Double.parseDouble(jsonText);
+            Asserts.assertEquals(expected, value);
+            return;
+        }
+        // Float.NaN / Float.Inifinity is not supported by JSON format,
+        // use null
+        if (jfrObject instanceof Float) {
+            float expected = ((Float) jfrObject);
+            if (Float.isInfinite(expected) || Float.isNaN(expected)) {
+                Asserts.assertEquals("null", jsonText);
+                return;
+            }
+            float value = Float.parseFloat(jsonText);
+            Asserts.assertEquals(expected, value);
+            return;
+        }
+        if (jfrObject instanceof Integer) {
+            Integer expected = ((Integer) jfrObject);
+            double value = Double.parseDouble(jsonText);
+            Asserts.assertEquals(expected.doubleValue(), value);
+            return;
+        }
+        if (jfrObject instanceof Long) {
+            Long expected = ((Long) jfrObject);
+            double value = Double.parseDouble(jsonText);
+            Asserts.assertEquals(expected.doubleValue(), value);
+            return;
+        }
+
+        String jfrText = String.valueOf(jfrObject);
+        Asserts.assertEquals(jfrText, jsonText, "Primitive values don't match. JSON = " + jsonText);
+    }
+}