diff --git a/src/test/java/HttpEventCollector_JavaLoggingTest.java b/src/test/java/HttpEventCollector_JavaLoggingTest.java
index 6c9ba56e..e5c007e1 100644
--- a/src/test/java/HttpEventCollector_JavaLoggingTest.java
+++ b/src/test/java/HttpEventCollector_JavaLoggingTest.java
@@ -278,7 +278,7 @@ public void errorHandlingInvalidToken() throws Exception {
 
 
         System.out.println("======print logEx");
-        System.out.println(logEx.toString());
+        System.out.println(logEx);
         System.out.println("======finish print logEx");
         Assert.assertEquals("Invalid token", logEx.get(1).getErrorText());
         Assert.assertEquals(4, logEx.get(1).getErrorCode());
@@ -338,9 +338,9 @@ public void errorHandlingDisabledHttpEventCollectorEndpoint() throws Exception {
             Assert.fail("didn't catch errors");
         Assert.assertEquals(1, errors.size());
 
-        System.out.println(logEx.toString());
+        System.out.println(logEx);
         if (!StringUtils.containsAny(logEx.toString(), "Failed to connect to", "Remote host terminated the handshake", "Connection reset"))
-            Assert.fail(String.format("Unexpected error message '%s'", logEx.toString()));
+            Assert.fail(String.format("Unexpected error message '%s'", logEx));
     }
 
 
diff --git a/src/test/java/HttpEventCollector_Log4j2Test.java b/src/test/java/HttpEventCollector_Log4j2Test.java
index 1d4b16fa..7cad5bf6 100644
--- a/src/test/java/HttpEventCollector_Log4j2Test.java
+++ b/src/test/java/HttpEventCollector_Log4j2Test.java
@@ -270,7 +270,7 @@ public void errorHandlingInvalidToken() throws Exception {
         }
 
         System.out.println("======print logEx");
-        System.out.println(logEx.toString());
+        System.out.println(logEx);
         System.out.println("======finish print logEx");
         Assert.assertEquals("Invalid token", logEx.get(1).getErrorText());
         Assert.assertEquals(4, logEx.get(1).getErrorCode());
@@ -327,7 +327,7 @@ public void errorHandlingDisabledHttpEventCollectorEndpoint() throws Exception {
 
         System.out.println(logEx);
         if (!StringUtils.containsAny(logEx.toString(), "Failed to connect to", "Remote host terminated the handshake", "Connection reset"))
-            Assert.fail(String.format("Unexpected error message '%s'", logEx.toString()));
+            Assert.fail(String.format("Unexpected error message '%s'", logEx));
     }
 
     /**
diff --git a/src/test/java/HttpEventCollector_LogbackTest.java b/src/test/java/HttpEventCollector_LogbackTest.java
index 96ca3c33..30860ebd 100644
--- a/src/test/java/HttpEventCollector_LogbackTest.java
+++ b/src/test/java/HttpEventCollector_LogbackTest.java
@@ -256,7 +256,7 @@ public void errorHandlingInvalidToken() throws Exception {
 
 
         System.out.println("======print logEx");
-        System.out.println(logEx.toString());
+        System.out.println(logEx);
         System.out.println("======finish print logEx");
         Assert.assertEquals("Invalid token", logEx.get(1).getErrorText());
         Assert.assertEquals(4, logEx.get(1).getErrorCode());
@@ -317,9 +317,9 @@ public void errorHandlingDisabledHttpEventCollectorEndpoint() throws Exception {
             Assert.fail("didn't catch errors");
         Assert.assertEquals(1, errors.size());
 
-        System.out.println(logEx.toString());
+        System.out.println(logEx);
         if (!StringUtils.containsAny(logEx.toString(), "Failed to connect to", "Remote host terminated the handshake", "Connection reset"))
-            Assert.fail(String.format("Unexpected error message '%s'", logEx.toString()));
+            Assert.fail(String.format("Unexpected error message '%s'", logEx));
     }
 
     /**