Changes in class not reflecting on successive program runs

Hi
My server is linux one...
my jsp program which is calling a class function is working fine for the first time.but if i made any changes to the class and after copied to the server, it is not working onthe successive runs.
I cheked the size of the class file and it reflects the changes.So problem witht he jsp,to receive the class changes.can anybody help to find where is the problem
when I copied this class to a new package and tried again, it will work on the first time. Again the changes to that class will not be reflected in jsp on successive runs.
Regards

My jsp code
<%@page language="java"
     import="java.sql.*,java.io.*,mySAP.*,java.net.URL;"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%!StringBuffer stringbuffer = new StringBuffer();
     int testemp;%>
<%
     String dofrom;
     String doto;
     String s;
     String s1;
     dofrom = request.getParameter("DOFrom");
     doto = request.getParameter("DOTo");
     ResultSet resultset;
     String flag = request.getParameter("dall");
     mySAP.JcoTest2 obj = new mySAP.JcoTest2();
     //StringBuffer sb = obj.fetchData("one", "two");
     String sb = obj.checking();
     out.println(sb);
     try {
          StringBuffer stringbuffer = new StringBuffer();
          String separator = System.getProperty("file.separator");
          String path = System.getProperty("user.dir") + separator;
     } catch (Exception e) {
          out.println("error%%%%%%%%%" + e);
%>
</body>
</html>here i am calling JcoTest2 from mySAP pack...
first time it is showing correct output of JcoTest2 .if i change JcoTest2 and copy and run .jsp is outputing the old program value.
.I used to complie my program in local machine and copy the class file and jsp file into the server(linux).
Regards

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