Index: org/apache/tomcat/util/net/jsse/JSSESupport.java
===================================================================
--- org/apache/tomcat/util/net/jsse/JSSESupport.java	(revision 831814)
+++ org/apache/tomcat/util/net/jsse/JSSESupport.java	(working copy)
@@ -211,7 +211,7 @@
         byte [] ssl_session = session.getId();
         if ( ssl_session == null) 
             return null;
-        StringBuffer buf=new StringBuffer("");
+        StringBuilder buf=new StringBuilder();
         for(int x=0; x<ssl_session.length; x++) {
             String digit=Integer.toHexString((int)ssl_session[x]);
             if (digit.length()<2) buf.append('0');
Index: org/apache/tomcat/util/net/URL.java
===================================================================
--- org/apache/tomcat/util/net/URL.java	(revision 831814)
+++ org/apache/tomcat/util/net/URL.java	(working copy)
@@ -534,7 +534,7 @@
      */
     public String toExternalForm() {
 
-        StringBuffer sb = new StringBuffer();
+        StringBuilder sb = new StringBuilder();
         if (protocol != null) {
             sb.append(protocol);
             sb.append(":");
@@ -563,7 +563,7 @@
      */
     public String toString() {
 
-        StringBuffer sb = new StringBuffer("URL[");
+        StringBuilder sb = new StringBuilder("URL[");
         sb.append("authority=");
         sb.append(authority);
         sb.append(", file=");