Netty (software)

Netty is a non-blocking I/O client-server framework for the development of Java network applications such as protocol servers and clients. The asynchronous event-driven network application framework and tools are used to simplify network programming such as TCP and UDP socket servers.^[2] Netty includes an implementation of the reactor pattern of programming. Originally developed by JBoss, Netty is now developed and maintained by the Netty Project Community.

Netty

Original author(s)	Trustin Heuiseung Lee
Developer(s)	Netty Project Community
Stable release	4.2.0[1]  / 3 April 2025; 35 days ago (3 April 2025)
Preview release	5.0.0.Alpha5 / September 28, 2022; 2 years ago (2022-09-28)
Repository	Netty Repository
Written in	Java
Type	Enterprise Integration Patterns Message Oriented Middleware
License	Apache License 2.0
Website	netty.io

Besides being an asynchronous network application framework, Netty also includes built-in implementations of SSL/TLS, HTTP, HTTP/2, HTTP/3, WebSockets, DNS, Protocol Buffers, SPDY and other protocols. Netty is not a Java web container, but is able to run inside one, and supports message compression. Netty has been actively developed since 2004.^[3]

Beginning with version 4.0.0, Netty also supports the usage of NIO.2 as a backend, along with NIO and blocking Java sockets.

See also

• Free and open-source software portal

• Application server
• Node.js
• Twisted (software)
• Apache MINA
• List of application servers § Java