This conversation was recorded at GOTO Copenhagen 2025. #GOTOcon #GOTOcph
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Arjen Poutsma - Practical Insights from a Spring Framework Veteran @apoutsma 

RESOURCES
https://bsky.app/profile/poutsma.bsky.social
https://fosstodon.org/@poutsma
https://github.com/poutsma
https://www.linkedin.com/in/arjen-poutsma-288ba6
https://poutsma-principles.com

ABSTRACT
How do you evolve a framework over nearly two decades without losing the trust of millions of developers? In this talk, I will reflect on 19 years of working on Spring, the Java application framework—from the early days of XML configuration, through the rise of annotations, to the advent of functional programming.

I will share the lessons that come not just from designing APIs and writing code, but from practicing open source stewardship over time. That includes how to innovate under constraints, how to evolve APIs responsibly, how to serve a growing community, and why empathy and restraint are essentials skills when it comes to maintaining open source.

This talk is for anyone willing to learn from my past mistakes, so they can make entirely new ones. [...]

TIMECODES
00:00 Intro
02:10 Anecdote: Academic background
04:35 Web controllers
11:37 Anecdote: Bubble sort in Spring MVC
16:16 HTTP clients
20:05 Anecdote: URI methods
23:11 Anecdote: 5 years to fix a mistake
30:07 Closing thoughts
35:58 Outro

Download slides and read the full abstract here:
https://gotocph.com/2025/sessions/3731

RECOMMENDED BOOKS
Rod Johnson • Expert One-On-One J2Ee Design and Development • https://amzn.to/48oCxAJ
Thomas Vitale • Cloud Native Spring in Action • https://amzn.to/3kLu1ns
Mauricio Salatino • Platform Engineering on Kubernetes • https://amzn.to/3X14qZK
Mark Heckler • Spring Boot: Up & Running • https://amzn.to/3c0NK19
Johnson, Höller, Arendsen, Risbert & Sampaleanu • Professional Java Development with the Spring Framework • https://amzn.to/44J4SRb

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GOTO's resource offers insights, tutorials, and resources for software developers, architects, and technology leaders. Readers can learn about emerging technologies, industry trends, and best practices for software development. With articles, talks, and workshops, GOTO provides  guidance and expertise for staying ahead in the ever-evolving world of technology.

A Long Spring: 19 Years of Living with Your Past Mistakes • Arjen Poutsma • GOTO 2025