--- /dev/null	2018-06-17 23:18:20.806999507 +0800
+++ new/test/jdk/jfr/jvm/TestGetAllEventClasses.java	2019-01-29 11:05:30.680311488 +0800
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2018, 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.jvm;
+
+import jdk.jfr.Event;
+import jdk.jfr.internal.JVM;
+
+import java.util.List;
+
+/*
+ * @test TestGetAllEventClasses
+ * @key jfr
+ * @library /lib/testlibrary
+ * @modules jdk.jfr/jdk.jfr.internal
+ *
+ * @build jdk.jfr.jvm.HelloWorldEvent1
+ * @build jdk.jfr.jvm.HelloWorldEvent2
+ * @run main/othervm jdk.jfr.jvm.TestGetAllEventClasses
+ */
+public class TestGetAllEventClasses {
+
+    public static void main(String... args) throws ClassNotFoundException {
+        JVM jvm = JVM.getJVM();
+        // before creating  native
+        assertEmptyEventList(jvm);
+        jvm.createNativeJFR();
+        // after creating native
+        assertEmptyEventList(jvm);
+
+        // Test event class load is triggered and only once
+        Class<? extends Event> clazz = initialize("jdk.jfr.jvm.HelloWorldEvent1");
+        // check that the event class is registered
+        assertEventsIncluded(jvm, clazz);
+        // second active use of the same event class should not add another class
+        // to the list - it would already be loaded
+        clazz = initialize(clazz);
+        assertEventsIncluded(jvm, clazz);
+
+        // second event class
+        Class<? extends Event> clazz2 = initialize("jdk.jfr.jvm.HelloWorldEvent2");
+        // the list of event classes should now have two classes registered
+        assertEventsIncluded(jvm, clazz, clazz2);
+
+        // verify that an abstract event class is not included
+        Class<? extends Event> abstractClass = initialize(MyAbstractEvent.class); // to run <clinit>
+        assertEventsExcluded(jvm, abstractClass);
+
+        // verify that a class that is yet to run its <clinit> is not included in the list of event classes
+        assertEventsExcluded(jvm, MyUnInitializedEvent.class);
+
+        // ensure old classes are not lost
+        assertEventsIncluded(jvm, clazz, clazz2);
+
+        jvm.destroyNativeJFR();
+    }
+
+    private static Class<? extends Event> initialize(String name) throws ClassNotFoundException {
+        // Class.forName() will force the class to run its <clinit> method
+        return Class.forName(name).asSubclass(Event.class);
+    }
+
+    private static Class<? extends Event> initialize(Class<? extends Event> event) throws ClassNotFoundException {
+        return initialize(event.getName());
+    }
+
+    private static void assertEmptyEventList(JVM jvm) {
+        if (!jvm.getAllEventClasses().isEmpty()) {
+            throw new AssertionError("should not have any event classes registered!");
+        }
+    }
+
+    @SafeVarargs
+    private static void assertEventsExcluded(JVM jvm, Class<? extends Event>... targetEvents) {
+        assertEvents(jvm, false, targetEvents);
+    }
+
+    @SafeVarargs
+    private static void assertEventsIncluded(JVM jvm, Class<? extends Event>... targetEvents) {
+        assertEvents(jvm, true, targetEvents);
+    }
+
+    @SafeVarargs
+    private static void assertEvents(JVM jvm, boolean inclusion, Class<? extends Event>... targetEvents) {
+        final List<Class<? extends Event>> list = jvm.getAllEventClasses();
+        for (Class<? extends Event> ev : targetEvents) {
+           if (list.contains(ev)) {
+               if (inclusion) {
+                   continue;
+               }
+               throw new AssertionError(ev.getName() + " in list but should not be!");
+           }
+           if (!inclusion) {
+               continue;
+           }
+           throw new AssertionError(ev.getName() + " in not in list but should be!");
+       }
+    }
+
+    private static abstract class MyAbstractEvent extends Event {}
+    private static class MyUnInitializedEvent extends Event {}
+}