Adjust JFR checks for J9

Author: jbachorik

dd-java-agent/agent-profiling/src/main/java/com/datadog/profiling/agent/CompositeController.java

@@ -153,8 +153,11 @@ public static Controller build(ConfigProvider provider, ControllerContext contex
       }
       if (!isOracleJDK8) {
         try {
-          Class.forName("jdk.jfr.Event");
-          controllers.add(OpenJdkController.instance(provider));
+          Class<?> frClass = Class.forName("jdk.jfr.FlightRecorder");
+          boolean isJfrAvailable = (boolean)frClass.getMethod("isAvailable", new Class<?>[0]).invoke(null);
+          if (isJfrAvailable) {
+            controllers.add(OpenJdkController.instance(provider));
+          }
         } catch (Throwable ignored) {
           log.debug("Failed to load openjdk profiler", ignored);
         }

dd-java-agent/testing/src/test/groovy/AgentTestRunnerTest.groovy

@@ -181,8 +181,8 @@ class AgentTestRunnerTest extends AgentTestRunner {
 
   boolean isJFRSupported() {
     try {
-      Class.forName("jdk.jfr.Recording")
-      return true
+      Class<?> frClass = Class.forName("jdk.jfr.FlightRecorder");
+      return (boolean)frClass.getMethod("isAvailable", new Class<?>[0]).invoke(null);
     } catch (Throwable e) {
       return false
     }