Let's start by adding the required import statements to the top of the Main.groovy file after the package statement:
package webservice import java.sql.DriverManager import groovy.sql.Sql import io.vertx.core.AbstractVerticle import io.vertx.core.Future import io.vertx.core.Vertx import io.vertx.core.http.HttpMethod
A class that can handle Vert.x events is called a Verticle. By extending the abstract class, AbstractVerticle, provided by the Vert.x framework, we can easily change our class into a Verticle. Take the following line:
class Main { ... }
Change the preceding line to the following:
class Main extends AbstractVerticle { ... }
The most important method of the AbstractVerticle abstract class is called ...
