Has anyone granted special permission to a special principal in policy file?   
It doesn't work for me at J2SDK 1.4.2. When I use Subject.doAs the permission is denied,
but if I use Subject.doAsPrivileged I ever get granted permission for anybody.

The source code is:

SimplePermission.java

package spike.jaas;

import java.security.BasicPermission;

public class SimplePermission extends BasicPermission {
    public SimplePermission(String name) {
        super(name);
    }

    public SimplePermission(String name, String actions) {
        super(name, actions);
    }
}

SimplePrincipal.java

package spike.jaas;

import java.security.Principal;

public class SimplePrincipal implements Principal {
    public String getName() {
        return "name";
    }

    public String toString() {
        return "SimplePrincipal - " + getName();
    }
}

Main.java

package spike.jaas;

import javax.security.auth.Subject;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;
import java.security.*;

public class Main {
    public static void main(String[] args) throws LoginException {
        Policy original = Policy.getPolicy();
        LoggedPolicy loggedPolicy = new LoggedPolicy(original);
        Policy.setPolicy(loggedPolicy);

        Security.setProperty("login.config.url.1", "file:g:/projects/jaas-spike/login.rule");

        doTask();
    }

    private static void doTask() throws LoginException {
        LoginContext loginContext = new LoginContext("Sample");

        loginContext.login();

        Subject subject = loginContext.getSubject();

        final Permission permission = new SimplePermission("permission");

        Subject.doAs(subject, new PrivilegedAction() {
            public Object run() {

                SecurityManager securityManager = System.getSecurityManager();
                if (securityManager == null) {
                    securityManager = new SecurityManager();
                }

                securityManager.checkPermission(permission);
                return null;
            }
        });
    }
}

POLICY FILE
grant {
    permission java.security.SecurityPermission "getPolicy";
    permission java.security.SecurityPermission "setPolicy";
    permission java.security.SecurityPermission "setProperty.login.config.url.1";
    permission javax.security.auth.AuthPermission "createLoginContext.Sample";
    permission javax.security.auth.AuthPermission "modifyPrincipals";
    permission javax.security.auth.AuthPermission "doAs";
    permission javax.security.auth.AuthPermission "getSubject";
};

grant principal spike.jaas.SimplePrincipal "name" {
    permission spike.jaas.SimplePermission "permission";
};