Eclipse Vert.x 4.2.0.CR1 released!

We are ex­tremely pleased to an­nounce the first can­di­date re­lease of Vert.x 4.2.

Reactive SQL Client

Oracle client

The Re­ac­tive Or­a­cle Client joins the data­base clients fam­ily!

This client is in tech pre­view and we are eager to hear any feed­back you may have.

MSSQL client TLS and Azure support

Our MSSQL client now sup­ports TLS en­cryp­tion as well as Azure sup­port.

MQTT Server V5 supports

The MQTT Server has been up­graded to sup­port the ver­sion 5 of the pro­to­col par­tially (the auth mes­sage re­mains to be im­ple­mented).


Our Cas­san­dra client now sup­ports trac­ing, you can use it ei­ther with your favourite tracer.

Web Client enhancements

Our Web Client sup­ports now Oauth2 se­cu­rity.

WebClient client = WebClient.create(vertx);
OAuth2WebClient oauth2 = OAuth2WebClient.create(
    OAuth2Auth.create(vertx, new OAuth2Options(/* enter IdP config */)))

  // configure the initial credentials (needed to fetch if needed
  // the access_token
  .withCredentials(new TokenCredentials("some.jwt.token"));

It also of­fers an HTTP re­sponse caching fa­cil­ity.

WebClient client = WebClient.create(vertx);
WebClient cachingWebClient = CachingWebClient.create(client);


Dep­re­ca­tions and break­ing changes can be found on the wiki.

For this re­lease, there are no Docker im­ages.

The re­lease ar­ti­facts have been de­ployed to Maven Cen­tral and you can get the dis­tri­b­u­tion on Maven Cen­tral.

You can boot­strap a Vert.x 4.2.0.CR1 project using

The doc­u­men­ta­tion has been de­ployed on the web-​site:

That’s it! Happy cod­ing and see you soon on our user or dev chan­nels.

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