protected Group[] getRoleSets() throws LoginException 
{
        String targetUser = getUsername();
        Enumeration users = roles.propertyNames();
        SimpleGroup rolesGroup = new SimpleGroup("Roles");
        ArrayList groups = new ArrayList();
        groups.add(rolesGroup);
        while( users.hasMoreElements() && targetUser != null )
        {
            String user = (String) users.nextElement();
            String value = roles.getProperty(user);
            // See if this entry is of the form targetUser[.GroupName]=roles
            int index = user.indexOf('.");
            boolean isRoleGroup = false;
            boolean userMatch = false;
            if( index  > 0 && targetUser.regionMatches(0, user, 0, index) == true )
                isRoleGroup = true;
            else
               userMatch = targetUser.equals(user);
            // Check for username.RoleGroup pattern
            if( isRoleGroup == true )
            {
                String groupName = user.substring(index+1);
                if( groupName.equals("Roles") )
                    parseGroupMembers(rolesGroup, value);
                else
                {
                    SimpleGroup group = new SimpleGroup(groupName);
                    parseGroupMembers(group, value);
                    groups.add(group);
                }
            }
            else if( userMatch == true )
            {
                // Place these roles into the Default "Roles" group
                parseGroupMembers(rolesGroup, value);
            }
        }
        Group[] roleSets = new Group[groups.size()];
        groups.toArray(roleSets);
        return roleSets;
}

Create the set of roles the user belongs to by parsing the roles.properties data for username=role1,role2,... and username.XXX=role1,role2,... patterns.

 protected String getUsersPassword() 
{
        String username = getUsername();
        String password = null;
        if( username != null )
            password = users.getProperty(username , null);
        return password;
}

 public  void initialize(Subject subject,
    CallbackHandler callbackHandler,
    Map sharedState,
    Map options) 
{
                                                       
        super.initialize(subject, callbackHandler, sharedState, options);
        try
        {
            // Check for usersProperties & rolesProperties
            String option = (String) options.get("usersProperties");
            if( option != null )
               usersRsrcName = option;
            option = (String) options.get("rolesProperties");
            if( option != null )
               rolesRsrcName = option;
            // Load the properties file that contains the list of users and passwords
            loadUsers();
            loadRoles();
        }
        catch(Exception e)
        {
            // Note that although this exception isn't passed on, users or roles will be null
            // so that any call to login will throw a LoginException.
            super.log.error("Failed to load users/passwords/role files", e);
        }
}

Initialize this LoginModule.

 public boolean login() throws LoginException 
{
        if( users == null )
            throw new LoginException("Missing users.properties file.");
        if( roles == null )
            throw new LoginException("Missing roles.properties file.");
        return super.login();
}

Method to authenticate a Subject (phase 1). This validates that the users and roles properties files were loaded and then calls super.login to perform the validation of the password.