Tomcat: how to access (session) Manager from servlet

for Tomcat:

   ApplicationContextFacade appContextFacadeObj = (ApplicationContextFacade)    request.getSession().getServletContext();

    try
    {
        Field applicationContextField = appContextFacadeObj.getClass().getDeclaredField("context");
        applicationContextField.setAccessible(true);
        ApplicationContext appContextObj = (ApplicationContext) applicationContextField.get(appContextFacadeObj);
        Field standardContextField = appContextObj.getClass().getDeclaredField("context");
        standardContextField.setAccessible(true);
        StandardContext standardContextObj = (StandardContext) standardContextField.get(appContextObj);
        Manager persistenceManager = standardContextObj.getManager();
    }
    catch(SecurityException e)
    {
        logger.error(e);
    }
    catch(NoSuchFieldException e)
    {
        logger.error(e);
    }
    catch(IllegalArgumentException e)
    {
        logger.error(e);
    }
    catch(IllegalAccessException e)
    {
        logger.error(e);
    }

As opposed to Ihor's code, this code uses a little less abstraction by getting Manager from HttpSession:

private Manager manager(HttpSession session) throws Exception {

    Field facadeSessionField = StandardSessionFacade.class.getDeclaredField("session");
    facadeSessionField.setAccessible(true);
    StandardSession stdSession = (StandardSession) facadeSessionField.get(session);

    return stdSession.getManager();
}