Question 1

How do I set up an ActiveJ HTTP server quickly?

Accepted Answer

Use the HttpServer builder with an Eventloop and AsyncServlet, as shown in the README example. Start by running the eventloop, and define a servlet that returns an HttpResponse promise. The archetype command generates a basic project to get started.

Question 2

ActiveJ vs Spring Boot for microservices: which should I choose?

Accepted Answer

ActiveJ is better for high-performance, low-latency microservices with minimal dependencies, while Spring Boot offers a richer ecosystem and easier integration. Choose ActiveJ if performance and footprint are critical; otherwise, Spring's community support might be more practical.

Question 3

What are the performance benefits of ActiveJ Specializer?

Accepted Answer

ActiveJ Specializer optimizes classes at runtime by converting instances to static forms, enabling JVM optimizations like dead code elimination and inlining. This can significantly speed up compute-intensive operations, as demonstrated with expression evaluation examples.

Question 4

Can I use ActiveJ with existing Netty or RxJava code?

Accepted Answer

ActiveJ's Async.io is an alternative to Netty and RxJava, so direct integration isn't straightforward. You might need to refactor or use adapters, as ActiveJ promotes its own event-driven model without built-in compatibility layers.

Question 5

How does ActiveJ dependency injection compare to Guice?

Accepted Answer

ActiveJ Inject is faster and lighter, with benchmarks showing 5.5x speed over Guice. However, it uses custom annotations (@Provides) and may not support all Guice features, requiring code adaptation for migration.

Question 6

Is ActiveJ production-ready given its beta version?

Accepted Answer

While ActiveJ is used in some production scenarios, the beta status (6.0-beta2) implies potential instability and future breaking changes. Evaluate based on your risk tolerance and consider testing thoroughly before full deployment.

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