It looks like Vertx 3 is a very significant release. Vertx3 is a Java Reactive Microservice Framework. It fills many gaps and fixes direction with Vertx 2 (which was already very compelling). Vertx 3 seems even more targeted at the reactive microservices space. It adds support for pluggable messaging, it has more than one cluster manager, it has async MySQL support, as well as async support for Redis, and PostgreSQL support, and MongoDB. It adds support for microservices monitoring, stats and metrics. It is a lighter weight, non-container focus (no more classloader focus). It is much more like a lib and a lot less like a traditional Java EE container. It is a new direction for Vertx, and quite an improvement from Vertx 2.