Hands-On High Performance with Spring 5

runAsync() – running a task asynchronously

When we want to execute a background activity task asynchronously and do not want to return anything from that task, we can use the CompletableFuture.runAsync() method. It takes a parameter as a Runnable object and returns the CompletableFuture<Void> type.

Let's try to use the runAsync() method by creating another controller method in our BankController class, with the following example:

@RequestMapping(value = "/synccust")  @ResponseBody  public CompletableFuture<String> syncCustomerDetails() {    LOGGER.info("Entering in controller");    CompletableFuture<String> completableFuture = new     CompletableFuture<>();    CompletableFuture.runAsync(new Runnable() {            @Override      public void run() {        try {            completableFuture.complete(syncService.syncCustomerAccount() ...