MikeThomsen commented on a change in pull request #3613: NIFI-6502 Add 
padLeft() and padRight() functions to RecordPath functions
URL: https://github.com/apache/nifi/pull/3613#discussion_r315292045
 
 

 ##########
 File path: 
nifi-commons/nifi-properties/src/main/java/org/apache/nifi/util/StringUtils.java
 ##########
 @@ -78,25 +78,63 @@ public static String join(final Collection collection, 
String delimiter) {
         return sb.toString().substring(0, sb.lastIndexOf(delimiter));
     }
 
-    public static String padLeft(final String source, int length, char 
padding) {
-        if (source != null) {
+    public static String padLeft(final String source, int length, String 
padding) {
 
 Review comment:
   I also sent you a pull request for the verbiage for the top level `NOTICE` 
file.

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