Behaviour of methods returning CompletionStage with and without @Asynchronous

It is not clear what’s the difference, in the expected behavior, when returning a CompletableFuture from a method annotated with @Asynchronous and from a method without that annotation. Examples:

    import org.eclipse.microprofile.faulttolerance.Asynchronous;

    @Asynchronous
    public CompletionStage<String> serviceA() {
        CompletableFuture<String> future = new CompletableFuture<>();
        ...
        return future;
    }

    public CompletionStage<String> serviceA() {
        CompletableFuture<String> future = new CompletableFuture<>();
        ...
        return future;
    }

This is especially important when we are using the @Retry annotation in the methods. What will happen when a retry is performed in both serviceA() and serviceB()?

[Emily-Jiang]

Method without @Asynchronous annotation returning CompletionStage will not be retried even if Retry annotation is specified and the completionStage is completed exceptionally, which is the previous behaviour.

@Retry
public CompletionStage<String> serviceA() {
        CompletableFuture<String> future = new CompletableFuture<>();
        ...
        return future;
    }

In the above method, the serviceA returned exceptionally will not be retried.

[Emily-Jiang]

@brunobat @carlosdlr @Azquelt agreed the above statement on 19th Dec.