I can build the OSGi examples into a Karaf distribution but http://localhost:8181/graphql/schema.json doesn't resolve. There are no errors in the Karaf log. It doesn't look like the GraphQL Servlet has been deploy. Do I need to create a servlet class and deploy it to Karaf as a web archive first? If so, how do I do that? Sorry about these basic questions? I'm a Karaf newbie.