in the com.opensymphony.webwork.dispatcher.ActionContextCleanUp atribute is always false.

  public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        try {
            req.setAttribute(CLEANUP_PRESENT, Boolean.TRUE);
            chain.doFilter(req, res);
        } finally {
            req.setAttribute(CLEANUP_PRESENT, Boolean.FALSE); // always executed
            cleanUp(req);
        }
    }

Always cleanup

 protected static void cleanUp(ServletRequest req) {
        // should we clean up yet?
        Boolean dontClean = (Boolean) req.getAttribute(CLEANUP_PRESENT);
        if (dontClean != null && dontClean.booleanValue()) {
            return;
        }