weld-servlet-core has hard dependency on Jsp

 if (JspFactory.getDefaultFactory() != null) {
            JspApplicationContext jspApplicationContext = JspFactory.getDefaultFactory().getJspApplicationContext(context);

            // Register the ELResolver with JSP
            jspApplicationContext.addELResolver(manager.getELResolver());

            // Register ELContextListener with JSP
            try {
                jspApplicationContext.addELContextListener(new WeldELContextListener());
            } catch (Exception e) {
                throw WeldServletLogger.LOG.errorLoadingWeldELContextListener(e);
            }

            // Push the wrapped expression factory into the servlet context so that Tomcat or Jetty can hook it in using a container code
            context.setAttribute(EXPRESSION_FACTORY_NAME, manager.wrapExpressionFactory(jspApplicationContext.getExpressionFactory()));
        }