servlet access in the same time and the result "error"(urgent)

hai,

my question is why my servlet if access in the same time with two or more
user and the result is nor showing the right result. This error happen if
performance computer is low. How can i fix this problem ?

example:
user JAVA 1.4
win2000Server
MySQL 3.23.25
Servlet Name = test

user A access test and User B access test. Sometimes result for user A get
a user B Result otherwise User B get a result user A.


and my code is

 public void doGet(HttpServletRequest req,HttpServletResponse res)
  throws ServletException,IOException{
   synchronized(this){
    MainProcess(req,res);
   }
  }

  public void MainProcess(HttpServletRequest req,HttpServletResponse res)
  throws ServletException,IOException{
    //do something
  }

TIA,

andy

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