How to consume a Oauth2 project API with Vert.x

VertxOauth2Client.java

// setup an Oauth2 provider for Keycloak
OAuth2Auth oauth2 = KeycloakAuth.create(vertx, OAuth2FlowType.PASSWORD, config());

// credentials
JsonObject credentials = new JsonObject()
  .put("username", username)
  .put("password", password);

// create an WebClient to make request
final WebClient client = WebClient.create(vertx);

// get a OAuth2 token using the Client Credential Flow
oauth2.getToken(credentials, getToken -> {
  if (getToken.failed()) {
    getToken.cause().printStackTrace(System.err);
    return;
  }

  AccessToken token = getToken.result();

  // Make the real request to the protected resource
  client
    .get(apiEndPoint)
    .putHeader("Authorization", "Bearer " + token.principal().getString("access_token"))
    .send(req -> {
      if (req.failed()) {
        req.cause().printStackTrace(System.err);
        return;
      }

      System.out.println(req.result().body().toString());
    });
});