...

A demo called samples\jax_rs\basic_https shows you how to do communications using HTTPS.
TODO : do SpringSecurity demo Spring Security can be used too (see "JAXRS and Spring AOP" section for some general advice).

Configuring JAX-RS services

...

The other method, getTheBook() can not be dispatched to by a JAX-RS runtime as it's not possible to discover it through a JDK proxy. If this method also needs to be invoked then this method should either be added to the interface or CGLIB proxies have to be explicitly enabled (consult Spring AOP documentation for more details). For example :

<aop:config proxy-target-class="true"/>

Areas for improvement and TODO list.

...