JSession - проблема при передаче своего объекта - Разработка расширений для Joomla 1.5

        //на всякий случай положил ужо класс в общее место includes, до этого лежал у меня в компоненте
        JLoader::register('Salary', JPATH_SITE.DS.'includes'.DS.'classes'.DS.'salary.php');
        require_once(JPATH_SITE.DS.'includes'.DS.'classes'.DS.'salary.php');                //здесь определение моего класса Salary
        ............................
	$form = new Salary();
	$form->set('infotype', JRequest::getVar( 'infotype'));
	............................
	$session =& JFactory::getSession();

	//Комментарий 1
        //$session->restart();

	$session->set('salary', $form, md5('zp'));

        //Комментарий 2
	//$salary =& $session->get('salary', null, md5('zp'));
	//$infotype =& $salary->get('infotype');
	//echo "You enrer: ".$infotype;

	$mainframe->redirect( 'index.php?option=com_user&view=login' );

	require_once(JPATH_SITE.DS.'includes'.DS.'classes'.DS.'salary.php');

	$session =& JFactory::getSession();

        //Комментарий 3 
	//$session->restart();
    	//$session->fork();

	$salary =& $session->get('salary', null, md5('zp'));
	$infotype  =&  $salary->get('infotype');
        ..............................

java.lang.RuntimeException: PHP Fatal error:  UserViewLogin::display() [<a href='function.UserViewLogin-display'>function.UserViewLogin-display</a>]: The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition &quot;Salary&quot; of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition  in C:\env\apache-tomcat-6.0.16\webapps\test-joomla\components\com_user\views\login\view.html.php on line 125

	php.java.servlet.fastcgi.FastCGIServlet$CGIRunner.parseBody(FastCGIServlet.java:473)
	php.java.servlet.fastcgi.FastCGIServlet$CGIRunner.doExecute(FastCGIServlet.java:368)
	php.java.servlet.fastcgi.FastCGIServlet$CGIRunner.execute(FastCGIServlet.java:376)
	php.java.servlet.CGIServlet.handle(CGIServlet.java:400)
	php.java.servlet.PhpCGIServlet.handle(PhpCGIServlet.java:355)
	php.java.servlet.CGIServlet.doGet(CGIServlet.java:469)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

javax.servlet.ServletException: java.lang.RuntimeException: PHP Fatal error:  Call to a member function get() on a non-object in C:\env\apache-tomcat-6.0.16\webapps\test-joomla\components\com_user\views\login\view.html.php on line 125

	php.java.servlet.PhpCGIServlet.handle(PhpCGIServlet.java:389)
	php.java.servlet.CGIServlet.doGet(CGIServlet.java:469)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

$salary =& $session->get('salary', null, md5('zp'));
	$infotype  =&  $salary->get('infotype');

JLoader::register('Salary', JPATH_SITE.DS.'includes'.DS.'classes'.DS.'salary.php');

<?php
class Salary extends JObject {
	public $position;

	public function getPosition() {
		return $this->position;
	}
		
        public function __sleep() {
                return array('position');
        }

}
?>

JLoader::register('Salary', JPATH_SITE.DS.'includes'.DS.'classes'.DS.'salary.php');