December 2025 - Garden State JUG - Quarkus for Spring Developers

https://gsjug.org/meetings/2025/dec2025a.html

In this session, Eric will show concepts and conventions familiar to Spring developers and how those same concepts and conventions can be implemented in Quarkus, all while highlighting similarities and differences between them. Additionally, he will show similarities and differences in how testing is done, highlighting Quarkus Dev Services.

This session will be mostly live coding while minimizing the amount of slides. Eric will introduce an existing Spring application with a full test suite and build a Quarkus equivalent version of it, live.

1. @edeandrea Eric Deandrea Sr. Principal Software Engineer IBM for Developers
2. @edeandrea Who’s on Stage Today? Eric Deandrea 🤘 26+ years software development experience Java Champion 🤘 Contributor to Open Source projects Quarkus LangChain4j (& Quarkus LangChain4j) Docling Java Spring Boot, Spring Framework, Spring Security Wiremock Microcks 🤘 Boston Java Users ACM Chapter Vice Chair 🤘 Published author
3. @edeandrea • How Quarkus enables modern Java development & the Kubernetes-native experience • Introduce familiar Spring concepts, constructs, & conventions and how they map to Quarkus • Emphasis on testing patterns & practices https://red.ht/quarkus-spring-devs
4. @edeandrea https://youtu.be/spJwsa4KFrU RIP Java
5. @edeandrea Java,The Enterprise Workhorse
6. @edeandrea Monolith J2SE / J2EE Java / Jakarta EE Java,The Enterprise Workhorse
7. @edeandrea Cloud-Native Microservices Spring Boot MicroProfile Java,The Enterprise Workhorse J2SE / J2EE Java / Jakarta EE Monolith
8. @edeandrea Java,The Enterprise Workhorse J2SE / J2EE Java / Jakarta EE Spring Boot MicroProfile Monolith Cloud-Native Microservices
9. @edeandrea
10. @edeandrea The Warmup Issue with Java https://youtu.be/bWmuqh6wHgE (Simon Ritter - Azul Systems)
11. @edeandrea The Quarkus Difference
12. @edeandrea Build Time Runtime Packaging (maven, etc) gradle…) Load config file from file system Parse it Classpath scanning to find annotated classes Attempt to load class to enable/disable features Build its model of the world. Start the management (thread, pool…) @ @ </> How Does a Framework Start?
13. @edeandrea The Quarkus Way Runtime Build Time @ @ </> Package model
14. @edeandrea JVM Build Time @ @ </> Package model Native The Quarkus Way enables Native Compilation
15. @edeandrea Unification of Imperative & Reactive Unification of Imperative and Reactive
16. @edeandrea 🤘Zero-config Live coding 🤘Auto-provision services 🤘Continuous testing 🤘Dev UI 🤘CLI Enhancing Developer Joy
17. @edeandrea IT’S STILL JAVA!
18. @edeandrea Is it a Jedi Mind Trick?
19. @edeandrea What’s the Secret Sauce? 🤘Don’t be dynamic Holly Cummins - https://youtu.be/vnrXXvnqriA
20. @edeandrea What’s the Secret Sauce? 🤘Don’t be dynamic 🤘Dead code elimination / inlining Holly Cummins - https://youtu.be/vnrXXvnqriA
21. @edeandrea What’s the Secret Sauce? 🤘Don’t be dynamic 🤘Dead code elimination / inlining 🤘Extensible build process so libraries can participate 🤘Jandex Indexing (offline reflection) Holly Cummins - https://youtu.be/vnrXXvnqriA
22. @edeandrea What’s the Secret Sauce? 🤘Don’t be dynamic 🤘Dead code elimination / inlining 🤘Extensible build process so libraries can participate 🤘Jandex Indexing (offline reflection) 🤘Don’t make humans tell the computer what it knows Holly Cummins - https://youtu.be/vnrXXvnqriA
23. @edeandrea What’s the Secret Sauce? 🤘Don’t be dynamic 🤘Dead code elimination / inlining 🤘Extensible build process so libraries can participate 🤘Jandex Indexing (offline reflection) 🤘Don’t make humans tell the computer what it knows 🤘Continuous profiling & shaving 🤘Be reactive without forcing humans to do reactive Holly Cummins - https://youtu.be/vnrXXvnqriA
24. @edeandrea
25. @edeandrea Jam Time! https://github.com/quarkusio/spring-quarkus-perf-comparison
26. @edeandrea https://github.com/quarkusio/benchmarks Don’t Take My Word For It!
27. @edeandrea https://github.com/quarkusio/benchmarks Don’t Take My Word For It!
28. @edeandrea 🤘 Spring Boot 3 application contents: ◦ 35,843 classes ◦ 50,908 fields ◦ 170,828 methods ◦ Reflection: ◦ 11,887 classes ◦ 1,895 fields ◦ 13,164 methods 🤘 Quarkus 3 application contents: ◦ 22,158 classes ◦ 28,962 fields ◦ 104,915 methods ◦ Reflection: ◦ 7,304 classes ◦ 234 fields ◦ 6,519 methods 🤘 The Quarkus application has: ◦ 13,685 (38%) less classes ◦ 21,946 (43%) less fields ◦ 65,913 (39%) less methods ◦ 4,583 (39%) less classes using reflection ◦ 1,661 (88%) less fields using reflection ◦ 6,645 (50%) less methods using reflection A Real Example https://github.com/quarkusio/benchmarks
29. @edeandrea 🤘 Spring Boot 4 application contents: ◦ 37,635 classes ◦ 52,792 fields ◦ 178,894 methods ◦ Reflection: ◦ 12,929 classes ◦ 4,465 fields ◦ 19,529 methods 🤘 Quarkus 3 application contents: ◦ 22,158 classes ◦ 28,962 fields ◦ 104,915 methods ◦ Reflection: ◦ 7,304 classes ◦ 234 fields ◦ 6,519 methods 🤘 The Quarkus application has: ◦ 15,477 (41%) less classes ◦ 23,830 (45%) less fields ◦ 73,979 (41%) less methods ◦ 5,625 (44%) less classes using reflection ◦ 4,231 (95%) less fields using reflection ◦ 13,010 (67%) less methods using reflection A Real Example https://github.com/quarkusio/benchmarks
30. @edeandrea Success Stories
31. @edeandrea Don’t Take Our Word For It! https://www.redhat.com/en/resources/etat-du-valais-customer-case-study
32. @edeandrea https://quarkus.io/blog/orange-telco-core-network-api-management-with-quarkus
33. @edeandrea https://www.youtube.com/live/YNxz3KaTz5Y
34. @edeandrea https://quarkus.io/blog/tag/user-story Don’t Take Our Word For It!
35. @edeandrea https://quarkus.io/blog/tag/user-story Don’t Take Our Word For It!
36. @edeandrea Additional Resources
37. @edeandrea https://www.redhat.com/en/resources/greener-java-applications-detail Setup 🤘 AWS (us-east-1) 🤘 SLA > 99% 🤘 800 req/sec over 20 days 🤘 50% load The Cost / Carbon Impact
38. @edeandrea https://github.com/quarkusio/quarkus-super-heroes https://quarkus.io/quarkus-workshops/super-heroes Quarkus Superheroes
39. @edeandrea Open Source Open Foundation Open Governance
40. @edeandrea
41. @edeandrea Thank You!