In RESTful Web services all requests are handled by resources. The JAX-RS APIs implement resources as a Java class. A resource class is a Java class that is annotated with one, or more, RAX-RS annotations. The core of a RESTful Web service implemented using JAX-RS is a root resource class. The root resource class is the entry point to the resource tree exposed by a service. It may handle all requests itself, or it may provide access to sub-resources that handle requests.
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