package chapter10;import javax.net.ssl.SSLServerSocket;import javax.net.ssl.SSLServerSocketFactory;import javax.net.ssl.SSLSocket;/** * Basic SSL Server with client authentication. */public class SSLServerWithClientAuthExample    extends SSLServerExample{    public static void main(        String[] args)        throws Exception    {        SSLServerSocketFactory fact = (SSLServerSocketFactory)SSLServerSocketFactory.getDefault();        SSLServerSocket        sSock = (SSLServerSocket)fact.createServerSocket(Utils.PORT_NO);            sSock.setNeedClientAuth(true);                SSLSocket sslSock = (SSLSocket)sSock.accept();                doProtocol(sslSock);    }}