How to authenticate  a Servlet-- HELP!!!!!!!!

I have a Java client that try to contact with a servlet using a user and a password.
I know that the authentication is correct, because the message "User OK" (showed
below) appear, but I don't know what to do now to obtain an UrlConnection with
the servlet.
Every time a do conn = url.openConnection(), I obtain this exception:
java.io.FileNotFoundException: http://localhost:80/myappp/server
Please, help me!!!!!!!
The code is:
try{
URL url = new URL("http://"+ host+":"+port+"/myapp/server");
Environment env = new Environment();
env.setProviderUrl("t3://localhost:80/myapp/server");
env.setSecurityPrincipal("system");
env.setSecurityCredentials("password");
Subject s = new Subject();
Context ctx = null;
ctx = env.getInitialContext();
Authenticate.authenticate(env, s);
ctx.lookup("");
System.out.println("User OK");
conn = url.openConnection();
catch (Exception e)
{System.out.println("User not authenticated :" + e.toString();}
Thank you very much,
Ivan

No, well not how you've described it.
Instead Do your implementation as a bean, then use that bean in your servlet and in your 'class' (application/applet).

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