8266410: jdk/jfr/javaagent/TestLoadedAgent.java failed with "Mismatch in TestEvent count"

Reviewed-by: mgronlun

test/jdk/jdk/jfr/javaagent/EventEmitterAgent.java

@@ -24,6 +24,7 @@
 package jdk.jfr.javaagent;
 
 import java.lang.instrument.Instrumentation;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 
@@ -31,6 +32,7 @@ import jdk.jfr.Configuration;
 import jdk.jfr.Event;
 import jdk.jfr.Name;
 import jdk.jfr.Recording;
+import jdk.jfr.consumer.RecordedEvent;
 import jdk.jfr.consumer.RecordingFile;
 import jdk.test.lib.Asserts;
 import jdk.test.lib.jfr.EventNames;
@@ -38,7 +40,7 @@ import jdk.test.lib.jfr.EventNames;
 // Java agent that emits events
 public class EventEmitterAgent {
 
-    private static final long EVENTS = 150_000;
+    private static final long EVENTS = 15_000;
     private static final Path DUMP_PATH = Paths.get("dump.jfr").toAbsolutePath();
 
     // Called when agent is loaded from command line
@@ -88,10 +90,21 @@ public class EventEmitterAgent {
     }
 
     public static void validateRecording() throws Exception {
-        long testEventCount = RecordingFile.readAllEvents(DUMP_PATH)
-                .stream()
-                .filter(e -> e.getEventType().getName().equals("Test"))
-                .count();
+        long testEventCount = 0;
+        try (RecordingFile rf = new RecordingFile(DUMP_PATH)) {
+            while (rf.hasMoreEvents()) {
+                RecordedEvent e = rf.readEvent();
+                switch (e.getEventType().getName()) {
+                case "Test":
+                    testEventCount++;
+                    break;
+                case "jdk.DataLoss":
+                    System.out.println(e);
+                    break;
+                }
+            }
+        }
+        System.out.println("File size: " + Files.size(DUMP_PATH));
         Asserts.assertEquals(testEventCount, EVENTS, "Mismatch in TestEvent count");
     }
 }