Index: org/apache/coyote/ajp/AjpMessage.java
===================================================================
--- org/apache/coyote/ajp/AjpMessage.java	(revision 831814)
+++ org/apache/coyote/ajp/AjpMessage.java	(working copy)
@@ -431,7 +431,7 @@
 
 
     protected static String hexLine(byte buf[], int start, int len) {
-        StringBuffer sb = new StringBuffer();
+        StringBuilder sb = new StringBuilder();
         for (int i = start; i < start + 16 ; i++) {
             if (i < len + 4) {
                 sb.append(hex(buf[i]) + " ");
Index: org/apache/coyote/Response.java
===================================================================
--- org/apache/coyote/Response.java	(revision 831814)
+++ org/apache/coyote/Response.java	(working copy)
@@ -405,7 +405,7 @@
         contentLanguage = locale.getLanguage();
         if ((contentLanguage != null) && (contentLanguage.length() > 0)) {
             String country = locale.getCountry();
-            StringBuffer value = new StringBuffer(contentLanguage);
+            StringBuilder value = new StringBuilder(contentLanguage);
             if ((country != null) && (country.length() > 0)) {
                 value.append('-');
                 value.append(country);