I use serveletContainer to start the webconsole, but tips "missing the context root property", please tell us how to fix this problem.
thanks so much.

disclaimer: The webconsole and httpservice sub-projects are experimental and not production ready so your mileage will vary.

It would be helpful if you can provide reproduction steps to help us help you debug the issue.

The string; "missing the context root property" comes from ServletContainer.cpp:

std::shared_ptr<ServletHandler>
    ServletContainerPrivate::AddingService(ServiceReference<HttpServlet> const& reference)
    {
        Any contextRoot = reference.GetProperty(HttpServlet::PROP_CONTEXT_ROOT);
        if (contextRoot.Empty())
        {
            std::cout << "HttpServlet from " << reference.GetBundle().GetSymbolicName()
                      << " is missing the context root property." << std::endl;
            return nullptr;
        }
...

It seems like a HttpServlet service wasn't registered with an appropriate service property called org.cppmicroservices.HttpServlet.contextRoot. I suggest debugging the process and checking the registration of HttpServlet services.