Index: org/apache/catalina/loader/WebappClassLoader.java
===================================================================
--- org/apache/catalina/loader/WebappClassLoader.java	(revision 831814)
+++ org/apache/catalina/loader/WebappClassLoader.java	(working copy)
@@ -808,7 +808,7 @@
      */
     public String toString() {
 
-        StringBuffer sb = new StringBuffer("WebappClassLoader\r\n");
+        StringBuilder sb = new StringBuilder("WebappClassLoader\r\n");
         sb.append("  delegate: ");
         sb.append(delegate);
         sb.append("\r\n");
Index: org/apache/catalina/loader/WebappLoader.java
===================================================================
--- org/apache/catalina/loader/WebappLoader.java	(revision 831814)
+++ org/apache/catalina/loader/WebappLoader.java	(working copy)
@@ -433,7 +433,7 @@
     /** Extra repositories for this loader
      */
     public String getRepositoriesString() {
-        StringBuffer sb=new StringBuffer();
+        StringBuilder sb=new StringBuilder();
         for( int i=0; i<repositories.length ; i++ ) {
             sb.append( repositories[i]).append(":");
         }
@@ -449,7 +449,7 @@
 
     public String getLoaderRepositoriesString() {
         String repositories[]=getLoaderRepositories();
-        StringBuffer sb=new StringBuffer();
+        StringBuilder sb=new StringBuilder();
         for( int i=0; i<repositories.length ; i++ ) {
             sb.append( repositories[i]).append(":");
         }
@@ -506,7 +506,7 @@
      */
     public String toString() {
 
-        StringBuffer sb = new StringBuffer("WebappLoader[");
+        StringBuilder sb = new StringBuilder("WebappLoader[");
         if (container != null)
             sb.append(container.getName());
         sb.append("]");
@@ -1073,7 +1073,7 @@
             }
         }
 
-        StringBuffer classpath = new StringBuffer();
+        StringBuilder classpath = new StringBuilder();
 
         // Assemble the class path information from our class loader chain
         ClassLoader loader = getClassLoader();