import javax.security.auth.*;
import javax.security.auth.callback.*;
import javax.security.auth.login.*;
import com.sun.security.auth.callback.TextCallbackHandler;

public class JaasAcn {

    public static void main(String[] args) {

	LoginContext lc = null;
	try {
	    lc = new LoginContext("JaasSample", new TextCallbackHandler());
	} catch (LoginException le) {
	    System.err.println("Cannot create LoginContext. " + le.getMessage());
	    System.exit(-1);
	} catch (SecurityException se) {
	    System.err.println("Cannot create LoginContext. " + se.getMessage());
	    System.exit(-1);
	} 

    try {
	lc.login();
    } catch (LoginException le) {
	System.err.println("Authentication failed: ");
	System.err.println("  " + le.getMessage());
	System.exit(-1);
    }

    System.out.println("Authentication succeeded!");

    for (Object o : lc.getSubject().getPrivateCredentials())
	System.out.println (o);
    }
}