diff --git a/spring-test/src/test/java/org/springframework/test/context/testng/TrackingTestNGTestListener.java b/spring-test/src/test/java/org/springframework/test/context/testng/TrackingTestNGTestListener.java
index b529e29fc0..5ce4dd8b80 100644
--- a/spring-test/src/test/java/org/springframework/test/context/testng/TrackingTestNGTestListener.java
+++ b/spring-test/src/test/java/org/springframework/test/context/testng/TrackingTestNGTestListener.java
@@ -17,6 +17,7 @@
 package org.springframework.test.context.testng;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 
@@ -33,28 +34,25 @@ import org.testng.ITestResult;
  */
 public class TrackingTestNGTestListener implements ITestListener {
 
-	public final List<Throwable> throwables = new ArrayList<>();
-
 	public final AtomicInteger testStartCount = new AtomicInteger();
 
 	public final AtomicInteger testSuccessCount = new AtomicInteger();
 
 	public final AtomicInteger testFailureCount = new AtomicInteger();
 
+	public final List<Throwable> throwables = Collections.synchronizedList(new ArrayList<>());
+
 	public final AtomicInteger failedConfigurationsCount = new AtomicInteger();
 
 
 	@Override
-	public void onFinish(ITestContext testContext) {
-		this.failedConfigurationsCount.addAndGet(testContext.getFailedConfigurations().size());
+	public void onTestStart(ITestResult testResult) {
+		this.testStartCount.incrementAndGet();
 	}
 
 	@Override
-	public void onStart(ITestContext testContext) {
-	}
-
-	@Override
-	public void onTestFailedButWithinSuccessPercentage(ITestResult testResult) {
+	public void onTestSuccess(ITestResult testResult) {
+		this.testSuccessCount.incrementAndGet();
 	}
 
 	@Override
@@ -68,17 +66,8 @@ public class TrackingTestNGTestListener implements ITestListener {
 	}
 
 	@Override
-	public void onTestSkipped(ITestResult testResult) {
-	}
-
-	@Override
-	public void onTestStart(ITestResult testResult) {
-		this.testStartCount.incrementAndGet();
-	}
-
-	@Override
-	public void onTestSuccess(ITestResult testResult) {
-		this.testSuccessCount.incrementAndGet();
+	public void onFinish(ITestContext testContext) {
+		this.failedConfigurationsCount.addAndGet(testContext.getFailedConfigurations().size());
 	}
 
 }