In the previous chapter, we introduced you to the JAX-RS APIs for building RESTful web services. We also discussed how to build interceptors and filters for a RESTful web service application and their usage in real-life use cases. This chapter is a continuation of what we discussed in the previous chapter. This chapter will take you further into the JAX-RS APIs, and some complex use cases and their solutions.

The following topics are covered in this chapter:

• Understanding subresources and subresource locators in JAX-RS
• Dynamic dispatching and request matching
• Response builder explained
• Exception handling in JAX-RS
• Introducing validations in JAX-RS applications
• Supporting custom request-response message formats
• Asynchronous RESTful web services
• Asynchronous RESTful web service client
• Server-Sent Events
• Managing the HTTP cache in a RESTful web service
• Understanding filters and interceptors in JAX-RS
• Understanding the JAX-RS resource life cycle

Discussions on the JAX-RS framework would not be complete without covering the advanced features offered by the framework for building subresources, validations, exception handling, and extensions for handling various message types. Take a deep breath and get ready for a deep dive into the JAX-RS API.