Best java libraries for seamless web development.

javacv

Java interface to OpenCV and more

Java DSL for easy testing of REST services

An authentication plugin for Play Framework 2.x (Java) Play! Authenticate

Unified Queries for Java Querydsl - Unified Queries for Java querydsl

TCP/UDP client/server library for Java, based on Kryo

An Open Source XMPP Client Library written in Java for JVMs and Android Ignite Realtime: Smack API

Java JsonPath implementation json-path - Java JsonPath implementation - Google Project Hosting

Runtime code generation for the Java virtual machine. Byte Buddy - runtime code generation for the Java virtual machine