Hands-On High Performance with Spring 5

CompletableFuture with Spring Async

The CompletableFuture class was introduced in Java 8, and it provides a simple way to write asynchronous, multithreaded, non-blocking code. With Spring MVC, it is also possible to use CompletableFuture with controllers, services, and repositories from public methods annotated with @Async. CompletableFuture implements the Future interface, which provides the result of an asynchronous computation.

We can create CompletableFuture in the following simple way:

CompletableFuture<String> completableFuture = new CompletableFuture<String>();

To get the result of this CompletableFuture, we can call the CompletableFuture.get() method. This method will be blocked until Future is completed. For that, we can manually ...