GraphQL is a new style of protocol open sourced by Facebook and it is getting popular
especially in Mobile and Single Page Application as front end. GraphQL provides a complete
and understandable description of the data in your API, gives clients the power to ask for
exactly what they need and nothing more, makes it easier to evolve APIs over time, and
enables powerful developer tools.
The most important tool for GraphQL application is GraphiQL which is an web interface that
allow you to introspect the GraphQL server and execute queries and mutations. Once you have
your light-graphql-4j application up and running, the GraphiQL is served at