tang7526 commented on a change in pull request #10012:
URL: https://github.com/apache/kafka/pull/10012#discussion_r572543598



##########
File path: clients/src/main/java/org/apache/kafka/common/utils/Utils.java
##########
@@ -1334,4 +1334,13 @@ public static long getDateTime(String timestamp) throws 
ParseException, IllegalA
     public static <S> Iterator<S> covariantCast(Iterator<? extends S> 
iterator) {
         return (Iterator<S>) iterator;
     }
+
+    /**
+     * Checks if a string is null, empty or whitespace only.
+     * @param str a string to be checked
+     * @return true if the string is null, empty or whitespace only; 
otherwise, return false.
+     */    
+    public static boolean isBlank(String str) {

Review comment:
       > How about applying this helper method to code base?
   @chia7712  OK.  I will do it on next PR.
   




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