title: Configuring a thread pool for Spring Boot asynchronous TaskExecutors?
body: <p>I'm going through <a href="https://www.javacodegeeks.com/2015/07/understanding-callable-and-spring-deferredresult.html" rel="nofollow noreferrer">this tutorial</a> which explains the difference between using a <code>Callable</code> and a <code>DeferredResult</code> with the servlet 3.0 spec and Spring.  For <code>Callable</code>s spring manages the thread, so I presume then that we need to configure a thread pool?  How is this configured for Spring Boot?</p>