Javalin¶

We will be using a Java library called Javalin for building our REST API.

You need to add the following to the dependencies clause of build.gradle:

1 2	compile 'org.slf4j:slf4j-simple:1.8.0-beta4'; compile 'io.javalin:javalin:3.7.0';

Javalin needs slf4j (for logging).

Run a server locally!¶

Running Javalin is as easy as follows!

public class ApiServer {
  public static void main(String[] args) {
    Javalin app = Javalin.create().start(7000);
    app.get("/", ctx -> ctx.result("Hello World!"));
  }
}

After running the ApiServer, point your browser to http://localhost:7000/ to see the following message!

1	Hello World!

Notice the following statement

1	app.get("/", ctx -> ctx.result("Hello World!"));

The -> is part of Java's Lambda syntax. This syntax may be strange to you! If that is the case, read the next section (otherwise skip it).