LOG.info("Set application version url to '" + applicationVersionURL
if (applicationVersionURL == null) { return; } LOG.info("Base of application version url is '" + applicationVersionURL
    public void init(ServletConfig config) throws ServletException {        super.init(config);        String applicationVersionURL = ServletTools.computeResourceURI(                getServletContext(), DEFAULT_APPLICATION_VERSION_URL,                getClass());        LOG.info("Set application version url to '" + applicationVersionURL                + "'.");        String expires = getParameter(EXPIRE_PARAMETER);        if (expires != null) {            expirationDate = ExpirationDate.parse(getServletName(),                    EXPIRE_PARAMETER, expires);        }        if (LOG.isInfoEnabled() && expirationDate != null) {            if (expirationDate.getExpiresDate() >= 0) {                LOG.info("Expire date setted to "                        + expirationDate.getExpiresDate() + "  for sevlet '"                        + getServletName() + "'.");            }            if (expirationDate.getExpiresDelay() >= 0) {                LOG.info("Expire delay setted to "                        + Delay.format(expirationDate.getExpiresDelay())                        + " for sevlet '" + getServletName() + "'.");            }        }        getServletContext().setAttribute(APPLICATION_VERSION_URL_PROPERTY,                applicationVersionURL);    }