Vert.x applications are event-driven, asynchronous, and single-threaded. In this installment of the Open source Java projects series you'll learn about Vert.x, an event-driven framework similar to Node.js, that builds on the JVM and also extends it in some important new ways. Now a similar framework has emerged, which deploys servers inside a JVM, using JVM facilities to manage traffic to lightweight server processes. Rather than starting heavyweight containers that would service requests using multiple threads, Node.js starts multiple lightweight, single-threaded servers and routes traffic to them. When Node.js emerged a few years ago, many developers were excited about its unusual approach to building scalable server-side applications. This installment of the Open source Java projects series introduces Vert.x with two hands-on examples based on the newly released Vert.x 2.0: First, build a simple Vert.x web server, then discover for yourself how the Vert.x event bus handles publish/subscribe and point-to-point messaging for effective enterprise integration. If you were excited about Node.js, Vert.x could be the next big thing for you: a similarly architected enterprise system that is built on the JVM.
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