MicroProfile Fault Tolerance

So, we have our service configured and we can check its health. The next step for a microservice to become cloud-native is adding some resilience. The service should be able to self-heal within certain limits.

There are six annotations available within MicroProfile Fault Tolerance that can help make your service more robust:

• @Asynchronous
• @Retry
• @Timeout
• @Bulkhead
• @CircuitBreaker
• @Fallback

It is good to know that these annotations can be added to both CDI beans and public methods within those beans. Under the hood, they are implemented via interceptors.

@Asynchronous

@Asynchronous adds, well, asynchronous behavior to the method it annotates. It wraps them into a method that returns CompletableStage on which the other fault tolerance annotation can be applied.

@Asynchronous allows your code to run concurrently. Let’s have a look at an example:

@Inject
// is annoted with @Asynchronous
private CustomerDetailsService...