code: public JspConfigType<WebAppDescriptor> getOrCreateJspConfig()
     {
        List<Node> nodeList = model.get("jsp-config");
        if (nodeList != null &&  nodeList.size() > 0)
        {
           return new JspConfigTypeImpl<WebAppDescriptor>(this, "jsp-config", model, nodeList.get(0));
        }
        return createJspConfig();
     }
docs: If not already created, a new <code>jsp-config</code> element will be created and returned.
  Otherwise, the first existing <code>jsp-config</code> element will be returned.
  @return the instance defined for the element <code>jsp-config</code>