Netty - the Java NIO Client Server Socket Framework

Netty is an asynchronous event-driven network application framework
for rapid development of maintainable high performance protocol servers & clients.

Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server. 'Quick and easy' doesn't mean that a resulting application will suffer from a maintainability or a performance issue. Netty has been designed carefully with the experiences earned from the implementation of a lot of protocols such as FTP, SMTP, HTTP, and various binary and text-based legacy protocols. As a result, Netty has succeeded to find a way to achieve ease of development, performance, stability, and flexibility without a compromise.

Status and Road Map

3.2.7.Final has been released on 24-Nov-2011. Please feel free to browse the documentation, check out the testimonials from the satisfied, grab a download, and join us on our community to open the future of network application development! The complete road map is available in our issue tracking system, and you are always welcome to report a bug or to contribute · request a new feature.

Features

Netty was designed and written from scratch to provide the best experience in network application development:

Design	Unified API for various transport types - blocking and non-blocking socket Based on a flexible and extensible event model which allows clear separation of concerns Highly customizable thread model - single thread, one or more thread pools such as SEDA True connectionless datagram socket support (since 3.1)
Ease of use	Well-documented Javadoc, user guide and examples No more big fat monolithic core which has unnecessary features No additional dependencies but JDK 1.5 (or above)
Performance	Better throughput, lower latency Less resource consumption Minimized unnecessary memory copy
Robustness	No more OutOfMemoryError due to fast, slow or overloaded connection. No more unfair read / write ratio often found in a NIO application under high speed network
Security	Complete SSL/TLS and StartTLS support Runs OK in a restricted environment such as Applet
Community	Release early, release often The author has been writing similar frameworks since 2003 and he still finds your feed back precious!