Jersey (JAX-RS) Notes Intro
Jersey (JAX-RS) is an open source production grade Java based API library to easily build Restful Web services server and client components.
It is also a reference implementation for JAX-RS (JSR 311 & JSR 339) API. Jersey is getting a lot of traction due to evolution of Restful API based product development.
Spring MVC and Apache CXF are few other products available in the Java eco system for developing Restful APIs. But Jersey stands tall due to its lean and exclusive implementation for Restful Web Services.