From ac9da84c8649f2a80f594e13a269db6df319a813 Mon Sep 17 00:00:00 2001
From: PJ Fanning <fanningpj@apache.org>
Date: Mon, 7 Aug 2023 19:11:54 +0000
Subject: [PATCH] use of junit internal StringUtils is causing build issues

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1911519 13f79535-47bb-0310-9956-ffa450edef68
---
 .../test/java/org/apache/poi/stress/TestAllFiles.java  | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/poi-integration/src/test/java/org/apache/poi/stress/TestAllFiles.java b/poi-integration/src/test/java/org/apache/poi/stress/TestAllFiles.java
index 4d21916baa..446375affd 100644
--- a/poi-integration/src/test/java/org/apache/poi/stress/TestAllFiles.java
+++ b/poi-integration/src/test/java/org/apache/poi/stress/TestAllFiles.java
@@ -275,10 +275,12 @@ public class TestAllFiles {
     }
 
     private static boolean isBlank(final String str) {
-        final int strLen = str.length();
-        for (int i = 0; i < strLen; i++) {
-            if (!Character.isWhitespace(str.charAt(i))) {
-                return false;
+        if (str != null) {
+            final int strLen = str.length();
+            for (int i = 0; i < strLen; i++) {
+                if (!Character.isWhitespace(str.charAt(i))) {
+                    return false;
+                }
             }
         }
         return true;