diff --git a/src/java.base/share/classes/java/lang/Integer.java b/src/java.base/share/classes/java/lang/Integer.java
index 2e33818963d32..60677f23de0fa 100644
--- a/src/java.base/share/classes/java/lang/Integer.java
+++ b/src/java.base/share/classes/java/lang/Integer.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1994, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1994, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -627,7 +627,7 @@ public static int parseInt(String s, int radix)
          */
 
         if (s == null) {
-            throw new NumberFormatException("null");
+            throw new NumberFormatException("Cannot parse null string");
         }
 
         if (radix < Character.MIN_RADIX) {
@@ -832,7 +832,7 @@ public static int parseInt(String s) throws NumberFormatException {
     public static int parseUnsignedInt(String s, int radix)
                 throws NumberFormatException {
         if (s == null)  {
-            throw new NumberFormatException("null");
+            throw new NumberFormatException("Cannot parse null string");
         }
 
         int len = s.length();
diff --git a/src/java.base/share/classes/java/lang/Long.java b/src/java.base/share/classes/java/lang/Long.java
index 8965032101831..d85c8966f4f0b 100644
--- a/src/java.base/share/classes/java/lang/Long.java
+++ b/src/java.base/share/classes/java/lang/Long.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1994, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1994, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -682,7 +682,7 @@ public static long parseLong(String s, int radix)
               throws NumberFormatException
     {
         if (s == null) {
-            throw new NumberFormatException("null");
+            throw new NumberFormatException("Cannot parse null string");
         }
 
         if (radix < Character.MIN_RADIX) {
@@ -893,7 +893,7 @@ public static long parseLong(String s) throws NumberFormatException {
     public static long parseUnsignedLong(String s, int radix)
                 throws NumberFormatException {
         if (s == null)  {
-            throw new NumberFormatException("null");
+            throw new NumberFormatException("Cannot parse null string");
         }
 
         int len = s.length();