__PHP_Incomplete_Class when trying to access an object stored in session

by user615274   Last Updated September 09, 2019 21:10 PM

I work on implementing single sign on with joomla and simplesamlphp.

I try to use the simpleamlphp api in the context of a joomla plugin in the onAfterInitialise event.

To that end, the plugin in the onAfterInitialise event detects if there are in the parameters sent by the HTTP request one with name simplesamlphp and with valuesso, if it is true I start the object \SimpleSAML\Auth\Simple and start the authentication process by calling the requireAuth() method. This shows the simpleamlphp authentication form and by providing valid credentials redirects me to the site that initiated the authentication process, here I try to access the attributes of the authenticated user.

My problem is that I cannot access the attributes of the authenticated user in simplesamlphp because I cannot access the original instance of the \SimpleSAML\ Auth\Simple object

I am now trying to save the object in a session variable but I am getting the class error __PHP_Incomplete_Class

This is the code I'm trying


defined( '_JEXEC' ) or die( 'Restricted access' );

jimport( 'joomla.plugin.plugin' );


class plgSystemMysamlredirect extends JPlugin
    public function onAfterInitialise()
        $application = JFactory::getApplication();
        $session = JFactory::getSession();

        $jinput = $application->input;

        $get = (object) $jinput->get->getArray();

        if (isset($get->simplesamlphp) && $get->simplesamlphp === 'sso') {
            $auth = new SimpleSAML_Auth_Simple('default-sp');

            $session->set('auth', $auth);


        $auth = $session->get('auth');

        if (!is_null($auth)) {
            if ($auth->isAuthenticated()) {
                $attributes = $auth->getAttributes();


I welcome your comments and suggestions

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