Adjust JFR checks for J9

Author: jbachorik

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

@@ -153,7 +153,8 @@ public static Controller build(ConfigProvider provider, ControllerContext contex
       }
       if (!isOracleJDK8) {
         try {
-          Class.forName("jdk.jfr.Event");
+          Class<?> clz = Class.forName("jdk.jfr.Recording");
+          clz.newInstance();
           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

@@ -50,6 +50,9 @@ class AgentTestRunnerTest extends AgentTestRunner {
           if (!jfrSupported && info.name.startsWith("datadog.trace.bootstrap.instrumentation.jfr.")) {
             continue // skip exception-profiling classes - they won't load if JFR is not available
           }
+          if (info.name.startsWith("datadog.trace.bootstrap.instrumentation.jfr.")) {
+            println("===> ${info.name} : ${jfrSupported}")
+          }
           try {
             Class<?> bootstrapClass = Class.forName(info.getName())
             if (bootstrapClass.getClassLoader() != BOOTSTRAP_CLASSLOADER) {
@@ -181,7 +184,8 @@ class AgentTestRunnerTest extends AgentTestRunner {
 
   boolean isJFRSupported() {
     try {
-      Class.forName("jdk.jfr.Recording")
+      Class<?> clz = Class.forName("jdk.jfr.Recording")
+      clz.newInstance()
       return true
     } catch (Throwable e) {
       return false