Index: org/apache/catalina/LifecycleException.java
===================================================================
--- org/apache/catalina/LifecycleException.java	(revision 831814)
+++ org/apache/catalina/LifecycleException.java	(working copy)
@@ -127,7 +127,7 @@
      */
     public String toString() {
 
-        StringBuffer sb = new StringBuffer("LifecycleException:  ");
+        StringBuilder sb = new StringBuilder("LifecycleException:  ");
         if (message != null) {
             sb.append(message);
             if (throwable != null) {