Use ArrayUtils#EMPTY_STRING_ARRAY instead of creating new empty String arrays.

src/main/java/org/apache/commons/lang3/StringUtils.java

@@ -7507,7 +7507,7 @@ public class StringUtils {
             currentType = type;
         }
         list.add(new String(c, tokenStart, c.length - tokenStart));
-        return list.toArray(new String[0]);
+        return list.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
     }
 
     /**
@@ -7735,7 +7735,7 @@ public class StringUtils {
             }
         }
 
-        return substrings.toArray(new String[0]);
+        return substrings.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
     }
 
     // -----------------------------------------------------------------------
@@ -7923,7 +7923,7 @@ public class StringUtils {
         if (match || preserveAllTokens && lastMatch) {
             list.add(str.substring(start, i));
         }
-        return list.toArray(new String[0]);
+        return list.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
     }
 
     /**
@@ -8022,7 +8022,7 @@ public class StringUtils {
         if (match || preserveAllTokens && lastMatch) {
             list.add(str.substring(start, i));
         }
-        return list.toArray(new String[0]);
+        return list.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
     }
 
     /**
@@ -8835,7 +8835,7 @@ public class StringUtils {
         if (list.isEmpty()) {
             return null;
         }
-        return list.toArray(new String[0]);
+        return list.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
     }
 
     /**

src/main/java/org/apache/commons/lang3/exception/ExceptionUtils.java

@@ -274,7 +274,7 @@ public class ExceptionUtils {
             }
             frames.addAll(trace);
         }
-        return frames.toArray(new String[0]);
+        return frames.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
     }
 
     /**
@@ -325,7 +325,7 @@ public class ExceptionUtils {
         while (frames.hasMoreTokens()) {
             list.add(frames.nextToken());
         }
-        return list.toArray(new String[0]);
+        return list.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
     }
 
     /**

src/main/java/org/apache/commons/lang3/text/StrTokenizer.java

@@ -604,10 +604,10 @@ public class StrTokenizer implements ListIterator<String>, Cloneable {
             if (chars == null) {
                 // still call tokenize as subclass may do some work
                 final List<String> split = tokenize(null, 0, 0);
-                tokens = split.toArray(new String[0]);
+                tokens = split.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
             } else {
                 final List<String> split = tokenize(chars, 0, chars.length);
-                tokens = split.toArray(new String[0]);
+                tokens = split.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
             }
         }
     }