If you are using Maven or Gradle, add the following dependency to the _dependencies_ section of your
project descriptor to access the Vert.x Core API:

* Maven (in your `pom.xml`):

[source,xml,subs="+attributes"]
----
<dependency>
 <groupId>io.vertx</groupId>
 <artifactId>vertx-core</artifactId>
 <version>3.9.12</version>
</dependency>
----

* Gradle (in your `build.gradle` file):

[source,groovy,subs="+attributes"]
----
dependencies {
 compile 'io.vertx:vertx-core:3.9.12'
}
----