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I really cant understand what really is jersey..
What I know is that Jax-RS is an API for building REST web services, and jersey? I got some information and all say the same: "jersey is an implementation of Jax-RS". But what it means?
If jax-rs is an API, why we need jersey for create a rest web service? Is jersey a couple of more libs to aim with jax-rs? if yes, jax-rs is an incomplete API?
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Both Jersey and RESTEasy provide their own implementation. The difference is that Jersey additionally provides something called Chunked Output. It allows the server to send back to the client a response in parts (chunks).
Jersey is Sun's production quality reference implementation for JSR 311: JAX-RS: The Java API for RESTful Web Services. Jersey implements support for the annotations defined in JSR-311, making it easy for developers to build RESTful web services with Java and the Java JVM.
Using Spring Boot and JerseySpring Boot provides the spring-boot-starter-jersey module that allows you to use the JAX-RS programming model for the REST endpoints instead of Spring MVC. It works quite well with Jersey 2. x. For a complete example of creating a web application with Jersey 2.
JAX-RS is only a specification and it needs a compatible implementation to be used. On the other hand, Spring MVC is a complete framework with REST capabilities. Like JAX-RS, it also provides us with useful annotations to abstract from low-level details.
JAX-RS is an specification (just a definition) and Jersey is a JAX-RS implementation.
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Straight from the jersey site
Jersey framework is more than the JAX-RS Reference Implementation. Jersey provides its own API that extend the JAX-RS toolkit with additional features and utilities to further simplify RESTful service and client development. Jersey also exposes numerous extension SPIs so that developers may extend Jersey to best suit their needs.
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