Jakarta REST (JAX-RS) defines it’s own dependency injection using the @Context annotation. REST resources also support CDI injection if you enable CDI on the REST resource class (e.g. using a bean-defining annotation like @RequestScoped).
But injection doesn’t work out of the box on JAX-RS sub-resources. How to create sub-resources so that both injection mechanisms work also in sub-resources? I’ll show you, it’s very easy.
(more…)Services can often be optimized with asynchronous processing even without changing their behavior towards the outside world. The reason why some services aren’t efficient is that they need to wait for other services to provide a result to continue further. Let’s look how to call external REST services without waiting for them and also do multiple parallel calls independently and combine their results later with a reactive pipeline in Java EE 8.
(more…)