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A flexible performant web server written in java
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What is Undertow?

It is a flexible performant web server written in java, providing both blocking and non-blocking API’s based on NIO. It has a composition based architecture that allows you to build a web server by combining small single purpose handlers. The gives you the flexibility to choose between a full Java EE servlet 4.0 container, or a low level non-blocking handler, to anything in between.
Undertow is a tool in the Web Servers category of a tech stack.

Who uses Undertow?

12 companies reportedly use Undertow in their tech stacks, including MercadoLibre, Biting Bit, and Red Bull Media House.

9 developers on StackShare have stated that they use Undertow.

Undertow Integrations

Why developers like Undertow?

Here’s a list of reasons why companies and developers use Undertow
Top Reasons
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Undertow's Features

  • Flexible Web Server
  • composition based architecture

Undertow Alternatives & Comparisons

What are some alternatives to Undertow?
It is a flexible, lightweight, managed application runtime that helps you build amazing applications. It supports the latest standards for web development.
Apache Tomcat
Apache Tomcat powers numerous large-scale, mission-critical web applications across a diverse range of industries and organizations.
Jetty is used in a wide variety of projects and products, both in development and production. Jetty can be easily embedded in devices, tools, frameworks, application servers, and clusters. See the Jetty Powered page for more uses of Jetty.
Writing scalable server applications in the Java™ programming language has always been difficult. Before its advent, thread management issues made it impossible for a server to scale to thousands of users. This framework has been designed to help developers to take advantage of the Java™ NIO API.
nginx [engine x] is an HTTP and reverse proxy server, as well as a mail proxy server, written by Igor Sysoev. According to Netcraft nginx served or proxied 30.46% of the top million busiest sites in Jan 2018.
See all alternatives

Undertow's Followers
7 developers follow Undertow to keep up with related blogs and decisions.
John Alton
Brandon Adams