Tomcat JAAS Authentication

[mjmatch]

I have configured Tomcat to do JAAS authentication using a custom login/error
page.  I am getting a nullponterexception as defined below.  Log messages
indicate that my JAAS authentication module is invoked and returning 'true'
from the auth module ::commit function.  I have defined my own User and Role
principle and specified in server.xml file.  Any suggestions on how to debug
the NPE that isn't in my code?  I'm not sure what to look at next... 
Thanks.
--Marco

Exception
=======
INFO: Server startup in 9775 ms
Aug 11, 2010 4:52:12 PM org.apache.catalina.connector.CoyoteAdapter service
SEVERE: An exception or error occurred in the container during the request
processing
java.lang.NullPointerException
        at java.util.Arrays.binarySearch0(Arrays.java:2001)
        at java.util.Arrays.binarySearch(Arrays.java:1943)
        at
org.apache.catalina.realm.GenericPrincipal.hasRole(GenericPrincipal.java:211)
        at org.apache.catalina.realm.RealmBase.hasRole(RealmBase.java:872)
        at
org.apache.catalina.realm.RealmBase.hasResourcePermission(RealmBase.java:795)
        at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:545)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
        at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
        at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:619)

Realm Definition
==========
<Realm className = "org.apache.catalina.realm.JAASRealm"
             appName="mikros"
             userClassNames="mikros.UserPrincipal"
             roleClassNames="mikros.RolePrincipal" />

JAAS Login Module
===========
public class Authenticator implements LoginModule {
    private static Logger log = Logger.getLogger(Authenticator.class);

    String loginName;
    CallbackHandler handler;
    Subject subject;
    Map<String, ?> sharedState; 
    Map<String, ?> options;
    
    
    private boolean loginPassed = false;
    
    public Authenticator() {
        
    }
    
    @Override
    public boolean abort() throws LoginException {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean commit() throws LoginException {
        try {
            UserPrincipal user = new UserPrincipal(loginName);
                RolePrincipal role = new RolePrincipal("admin");
         
                subject.getPrincipals().add(user);
                subject.getPrincipals().add(role);
                log.debug("Added user and role principals.");
        } catch (Exception e) {
            throw new LoginException(e.getMessage());
            }
        
        return true;
    }

    @Override
    public void initialize(Subject subject, 
                           CallbackHandler callbackHandler,
                           Map<String, ?> sharedState, 
                           Map<String, ?> options) {
        this.subject = subject;
        this.handler = callbackHandler;
        this.sharedState = sharedState;
        this.options = options;

    }

    @Override
    public boolean login() throws LoginException {
        log.debug("::login");
        
        String name = "";
        String pass = "";
        
        Context env = null;
        boolean passed = false;
        Callback[] callbacks = new Callback[2];
        
        callbacks[0] = new NameCallback("Username:");
        callbacks[1] = new PasswordCallback("Password:", false);
        
        try {
            handler.handle(callbacks);

            NameCallback nameCallback = (NameCallback) callbacks[0];
            name = nameCallback.getName();
            PasswordCallback passwordCallback = (PasswordCallback)
callbacks[1];
            pass = new String(passwordCallback.getPassword());

            log.debug("log in name:" + name + "  password:" + pass);
            
            if (name.equals("foo") &&
                pass.equals("bar")) {
                loginPassed = true;
                loginName = name;
                log.debug("login passed.");
            } else {
                loginPassed = false;
                log.debug("login failed.");
            }
            
            return loginPassed;
        }
        catch (Exception e) {
            throw new LoginException(e.getMessage());
        }
    }

    @Override
    public boolean logout() throws LoginException {
        try {
            UserPrincipal user = new UserPrincipal(loginName);
            RolePrincipal role = new RolePrincipal("admin");
            subject.getPrincipals().remove(user);
            subject.getPrincipals().remove(role);
            log.debug("Logged out:" + loginName);
        } catch (Exception e) {
            throw new LoginException(e.getMessage());
        }
        
        return true;
    }
}

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