Maven configuration changes

First, we need to add the following 2 dependencies to our project. Obviously we need the vertx-service-proxy APIs:

<dependency>
  <groupId>io.vertx</groupId>
  <artifactId>vertx-service-proxy</artifactId>
</dependency>

We need the Vert.x code generation module as a compilation-time only dependency (hence the provided scope):

<dependency>
  <groupId>io.vertx</groupId>
  <artifactId>vertx-codegen</artifactId>
  <scope>provided</scope>
</dependency>

Next we have to tweak the maven-compiler-plugin configuration to use code generation, which is done via a javac annotation processor:

<plugin>
  <artifactId>maven-compiler-plugin</artifactId>
  <version>3.5.1</version>
  <configuration>
    <source>1.8</source>
    <target>1.8</target>
    <useIncrementalCompilation>false</useIncrementalCompilation>
    <annotationProcessors>
      <annotationProcessor>io.vertx.codegen.CodeGenProcessor</annotationProcessor>
    </annotationProcessors>
    <generatedSourcesDirectory>${project.basedir}/src/main/generated</generatedSourcesDirectory>
    <compilerArgs>
      <arg>-AoutputDirectory=${project.basedir}/src/main</arg>
    </compilerArgs>
  </configuration>
</plugin>

Note that the generated code is put in src/main/generated, which some integrated development environments like IntelliJ IDEA will automatically pick up on the classpath.

It is also a good idea to update the maven-clean-plugin to remove those generated files:

<plugin>
  <artifactId>maven-clean-plugin</artifactId>
  <version>3.0.0</version>
  <configuration>
    <filesets>
      <fileset>
        <directory>${project.basedir}/src/main/generated</directory>
      </fileset>
    </filesets>
  </configuration>
</plugin>