Index: org/apache/catalina/tribes/group/GroupChannel.java
===================================================================
--- org/apache/catalina/tribes/group/GroupChannel.java	(revision 831814)
+++ org/apache/catalina/tribes/group/GroupChannel.java	(working copy)
@@ -367,7 +367,7 @@
      * @throws ChannelException
      */
     protected void checkOptionFlags() throws ChannelException {
-        StringBuffer conflicts = new StringBuffer();
+        StringBuilder conflicts = new StringBuilder();
         ChannelInterceptor first = interceptors;
         while ( first != null ) {
             int flag = first.getOptionFlag();
Index: org/apache/catalina/tribes/group/RpcChannel.java
===================================================================
--- org/apache/catalina/tribes/group/RpcChannel.java	(revision 831814)
+++ org/apache/catalina/tribes/group/RpcChannel.java	(working copy)
@@ -251,7 +251,7 @@
     }
     
     protected static String bToS(byte[] data) {
-        StringBuffer buf = new StringBuffer(4*16);
+        StringBuilder buf = new StringBuilder(4*16);
         buf.append("{");
         for (int i=0; data!=null && i<data.length; i++ ) buf.append(String.valueOf(data[i])).append(" ");
         buf.append("}");
Index: org/apache/catalina/tribes/group/RpcMessage.java
===================================================================
--- org/apache/catalina/tribes/group/RpcMessage.java	(revision 831814)
+++ org/apache/catalina/tribes/group/RpcMessage.java	(working copy)
@@ -72,7 +72,7 @@
     }
     
     public String toString() {
-        StringBuffer buf = new StringBuffer("RpcMessage[");
+        StringBuilder buf = new StringBuilder("RpcMessage[");
         buf.append(super.toString());
         buf.append("] rpcId=");
         buf.append(Arrays.toString(rpcId));