JDK 8 has made a significant step forward in the world of asynchronous programming by enhancing Future with CompletableFuture. The main limitations of Future are:

• It cannot be explicitly complete.
• It doesn't support callbacks for performing actions on the result.
• They cannot be chained or combined for obtaining complex asynchronous pipelines.
• It doesn't provide exception handling.

A CompletableFuture doesn't have these limitations. A simple, but useless CompletableFuture can be written as follows:

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

The result can be obtained via the blocking get() method:

completableFuture.get();

In addition to this, let's see several examples of running asynchronous tasks in the context of an e-commerce platform. We add these examples in a helper class named CustomerAsyncs.