Architecting Modern Java EE Applications

Asynchronous and reactive JAX-RS

JAX-RS supports asynchronous behavior to not unnecessarily block request threads on the server-side. Even if an HTTP connection is currently waiting for a response, the request thread could potentially handle other requests while the long-running process on the server is handled. Request threads are pooled by the container and this pool only has a certain size. In order to not unnecessarily occupy a request thread, JAX-RS asynchronous resource methods submit tasks that are executed while the request thread returns and is free to be reused again. The HTTP connection is being resumed and responded after the asynchronous task has been finished or when a timeout occurs. The following code shows an asynchronous ...