This is a simple demo project of how one may use Guice with Javalin.
In this example, I use a Multibinder to bind a "controller", which is really a class implementing the Javalin Plugin interface.
This controller class asks to be injected with an IDatabaseProvider class, which Guice provides as the MyDatabaseProvider implementation.
Finally, the JavalinContainer class receives all Plugin classes bound by the Multibinder in a set, and registers them on the Javalin instance.
To see the final product in action, simply run the project using gradle run, then navigate to http://localhost:7000/snacks/{key} where {key} is any of [key1, key2, key3], corresponding to the map in the MyDatabaseProvider class.
