Bucharest Tech Week 2026 - Guardians of the Cloud-Native Galaxy

The galaxy is vast, and microservices chaos is real. Guardians, assemble!

Join us to explore the Quarkus Superheroes saga - a reference architecture uniting REST, event-driven, and some AI infusion. You’ll be equipped with tactical gear for victory: mastering local dev flows, isolating "upstream" dependencies for bulletproof testing, and deploying to cloud-native environments.

Whether building reactive or traditional apps, you'll learn to fight bugs like supervillains. Suit up! It’s time to rescue your code from the void and become a true Guardian of the Cloud.

Transcript

2. @edeandrea BUT FIRST, A WORD FROM OUR SPONSOR
3. @edeandrea • Java Champion • 27+ years software development experience • Works on Open Source projects Quarkus LangChain4j, Quarkus LangChain4j Docling Java Langfuse Java, Quarkus Langfuse Spring Boot, Spring Framework, Spring Security Testcontainers Wiremock Microcks • Boston Java Users ACM Chapter Vice Chair & Board Member • Published Author • Cat lover Who am I?
4. @edeandrea • Showcase & explain Quarkus, how it enables modern Java development & the Kubernetes- native experience • Introduce familiar Spring concepts, constructs, & conventions and how they map to Quarkus • Equivalent code examples between Quarkus and Spring as well as emphasis on testing patterns & practices 4 https://red.ht/quarkus-spring-devs
8. @edeandrea https://www.multiplayer.app/blog/6-best-practices-for-backend-design-in-distributed-system/
11. @edeandrea OFF TO THE RESCUE! Image: https://www.thethings.com/forgotten-facts-about-christopher-reeves-superman
12. @edeandrea Help Me Superman! Need sample set of “real-world” applications that are… • More than “hello world” • Solves modern & real-world problems • Fully documented • Fully automated CI/CD • Full & complete test suite • Simple to demo, run, & deploy (local & remote) • Observable • Help facilitate local development of independent microservices • Fun Image: https://www.dailyrecord.co.uk/entertainment/celebrity/encounter-lois-lane-superman-actress-8711437
13. @edeandrea Image: https://www.pinterest.com/pin/518899188292555550
14. @edeandrea UNDER THE CAPE!
15. @edeandrea https://quarkus.io/quarkus-super-heroes https://github.com/quarkusio/quarkus-super-heroes https://quarkus.io/blog/quarkus-superheroes-to-the-rescue
16. @edeandrea Hero Service • Reactive & fully non-blocking HTTP microservice exposing CRUD operations • Hero information stored in PostgreSQL database ◦ Identical domain model as Villain Service • REST layer ◦ Jakarta RESTful service with reactive endpoints ◦ Implements PATCH/partial update via Mapstruct • Persistence layer ◦ Hibernate Reactive • Testing ◦ Pact contract verification ◦ Mocking/spying of beans ◦ Running tests in isolated transactions • Quarkus Qute templating engine for simple UI • Favors constructor injection of beans over field injection • 2 container images available (JVM Java 21, Native (amd64/arm64)) https://quarkus.io/quarkus-super-heroes/rest-heroes/
17. @edeandrea Villain Service • Classical HTTP microservice exposing CRUD operations on Virtual Threads • Villain information stored in PostgreSQL database ◦ Identical domain model as Hero Service • REST layer ◦ Jakarta RESTful service with blocking endpoints ◦ Implements PATCH/partial update via Mapstruct • Persistence layer ◦ Java Persistence API (Hibernate) • Custom configuration • Testing ◦ Pact contract verification ◦ Mocking/spying of beans ◦ Running tests in isolated transactions • Quarkus Qute templating engine for simple UI • Favors field injection of beans over constructor injection • 2 container images available (JVM Java 21, Native (amd64/arm64)) https://quarkus.io/quarkus-super-heroes/rest-villains/
18. @edeandrea Location Service • gRPC microservice exposing CRUD operations • Implemented in Kotlin • Location information stored in MariaDB database • Persistence layer ◦ Java Persistence API (Hibernate) • Testing ◦ Mocking/spying of beans ◦ Running tests in isolated transactions • Favors constructor injection of beans over field injection • 2 container images available (JVM Java 21, Native (amd64/arm64)) https://quarkus.io/quarkus-super-heroes/grpc-locations/
19. @edeandrea Narration Service • Classical HTTP microservice using LangChain4j with OpenAI • REST layer ◦ Jakarta RESTful service with blocking endpoints • Custom configuration via ConfigMapping objects • Testing ◦ Pact contract verification ◦ Mocking/spying of beans • 2 container images available (JVM Java 21, Native (amd64/arm64)) https://quarkus.io/quarkus-super-heroes/rest-narration/
20. @edeandrea Fight Service • Reactive & fully non-blocking HTTP microservice exposing CRUD & fight operations • Fight information stored in MongoDB database • Jakarta RESTful service with reactive endpoints • Persistence layer ◦ MongoDB persistence layer • Custom configuration via ConfigMapping objects • HTTP calls to Hero, Villain, Locations, & Narration services ◦ Uses SmallRye Stork service discovery & client-side load balancing ◦ Calls to Hero service using Quarkus rest client ◦ Calls to Villain service using JAX-RS client API ◦ Protected using resilience patterns (retry/timeout/fallback/circuit breaking) • gRPC calls to Location service • Emits Fight events to Kafka • Testing ◦ Pact contract verification ◦ Pact consumer-driven contracts ◦ Mocking/spying of beans ◦ Wiremock mocking of downstream REST endpoints ◦ In-memory Kafka connector & KafkaCompanion for message verification • Favors constructor injection of beans over field injection • 2 container images available (JVM Java 21, Native (amd64/arm64)) https://quarkus.io/quarkus-super-heroes/rest-fights/
21. @edeandrea Event Statistics Service • Event-driven microservice exposing WebSocket HTTP layer • Receives Fight events from Kafka ◦ Maintains top 10 winners with # of wins for each ◦ Maintains # of wins for heroes & villains • HTML/jQuery frontend ◦ Consumes stat data real-time via WebSockets • Testing ◦ Inject KafkaCompanion into tests using DevServices • Mixes constructor & field injection of beans • 2 container images available (JVM Java 21, Native (amd64/arm64)) https://quarkus.io/quarkus-super-heroes/event-statistics/
22. @edeandrea Super Hero UI • React app deployed inside Quarkus Quinoa • Full set of Jest tests • Communicates to Fight service via REST • 2 container images available (JVM Java 21, Native (amd64/arm64)) https://quarkus.io/quarkus-super-heroes/ui-super-heroes/
23. @edeandrea HOW CAN THEY HELP ME?
25. @edeandrea What can the Superheroes do for me? • Help me learn about Quarkus
26. @edeandrea https://sonarcloud.io/organizations/quarkusio-quarkus-super-heroes
27. @edeandrea What can the Superheroes do for me? • Help me learn about Quarkus • Provide easy sample application to deploy to showcase other “stuff” ◦ Metrics gathering, distributed tracing, AI integration, etc
29. @edeandrea What can the Superheroes do for me? • Help me learn about Quarkus • Provide easy sample application to deploy to showcase other “stuff” ◦ Metrics gathering, distributed tracing, AI integration, etc • Show how to implement fully automated CI/CD ◦ Pull request building ◦ Unit & integration testing ◦ Multi-arch image building & pushing (amd64 & arm64)
30. @edeandrea Quarkus Superheroes CI/CD https://github.com/quarkusio/quarkus-super-heroes/blob/main/docs/automation.md https://status.quarkus.io
31. @edeandrea
32. @edeandrea What can the Superheroes do for me? • Help me learn about Quarkus • Provide easy sample application to deploy to showcase other “stuff” ◦ Metrics gathering, distributed tracing, AI integration, etc • Show how to implement fully automated CI/CD ◦ Pull request building ◦ Unit & integration testing ◦ Multi-arch image building & pushing (amd64 & arm64) • Help me develop a microservice that’s part of a larger system?
33. @edeandrea LOCAL DEVELOPMENT
34. @edeandrea REMOTE DEVELOPMENT
35. @edeandrea Quarkus Remote Dev
36. @edeandrea Local Developer IDE Local Quarkus App Live Coding Incremental update Developer laptop k8s cluster Quarkus Remote Dev
37. @edeandrea Image: https://wallpaperaccess.com/the-incredibles
38. @edeandrea https://quarkus.io @quarkusio https://quarkus.io/community
39. @edeandrea @edeandrea Thank You! Slides https://bit.ly/ro-galaxy-guardians