Hi, all

last few days i tried to make connection on database through connection pool.
the code i used is:

<%
...
String error = null;
try{
    error = "Setting property...";
    java.util.Properties params = new java.util.Properties();
    params.setProperty(Context.INITIAL_CONTEXT_FACTORY ,
                                 "com.ibm.websphere.naming.WsnInitialContextFactory ");

    error = "Initializing InitialContext...";
javax.naming.Context ctx = new javax.naming.InitialContext(params); //here is error
    error = "getting DataSource...";
    javax.sql.DataSource ds = (javax.sql.DataSource)ctx.lookup("java:comp/env/jdbc/myDS");

    error = "getting connection...";
    java.sql.Connection conn = ds.getConnection(username, password);
    System.out.println("DataSource works!!");
}
catch (Exception e){
    System.out.println(error + e);
}
...
%>
i used variable error to detect where is problem.

when i start this application on Websphere server 4.0 i got following exception:

Initializing InitialContext...

javax.naming.NoInitialContextException:
Cannot instantiate class: com.ibm.websphere.naming.WsnInitialContextFactory
[Root exception is java.lang,ClassCastException]

if you have some ideas, or you have sollution,
please help.

thanks