JAX-RS 2.0 introduces Link class, which serves as a representation of Web Link defined in RFC 5988. The JAX-RS Link class adds API support for providing additional metadata in HTTP messages, for example, if you are consuming a REST interface of a public library, you might have a resource returning description of a single book. Then you can include links to related resources, such as a book category, author, etc. to make the produced response concise but complete at the same time. Clients are then able to query all the additional information they are interested in and are not forced to consume details they are not interested in. At the same time, this approach relieves the server resources as only the information that is truly requested is being served to the clients.
Read full article from Chapter 12. URIs and Links
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