Problem in creating Java Web Service

hi,
i am trying to create a simple java webservice through eclipse and tomcat.
this is my code: -----
package com.test;
public class addfunc {
     static StringBuffer sb = null;
     static String n3 = null;
     * @param args
     public void confunc(String n1, String n2, StringBuffer sb) {
          n3 = n1 + "~" + n2;
          sb = new StringBuffer(n3);
          System.out.println("inside confunc:" + sb);
     public static void main(String[] args) {
          // TODO Auto-generated method stub
          String n1 = "test1";
          String n2 = "test2";
          addfunc c = new addfunc();
          c.confunc(n1, n2, sb);
          sb = new StringBuffer(n3);
          System.out.println("before split : " + sb);
but i am not able to proceed through....while trying to create a web service i am getting the following error:---------------------------
The service class "com.test.addfunc" does not comply to one or more requirements of the JAX-RPC 1.1 specification, and may not deploy or function correctly.
The method "confunc" on the service class "com.test.addfunc" uses a data type, "java.lang.StringBuffer", that is not supported by the JAX-RPC specification. Instances of the type may not serialize or deserialize correctly. Loss of data or complete failure of the Web service may result.
Kindly suggest me the steps......
thanks!

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