Use `CompletableFuture` in Java for staged async workflows, fan-out and join patterns, and explicit failure handling across task graphs.
CompletableFuture gives Java a standard way to represent work that finishes later and to compose that work into larger asynchronous flows. It is most useful when the design problem is not raw concurrency alone, but dependency management between async steps.
That makes it a good fit for fan-out and join workflows, remote-call aggregation, staged transformations, and controlled recovery logic. It is a poor fit when the code becomes a long callback graph that would be clearer as blocking logic on virtual threads or as a bounded structured-concurrency scope.
The pages in this section focus on the two questions that matter most in reviews: how to compose async stages without hiding control flow, and how to handle failure without leaving partial work or unreadable recovery branches behind.