I just released version 3.0.1 of "JSON:API for Spring HATEOAS". This is a patch release with dependency updates to Spring Boot 4.0.1, and Spring HATEOAS 3.0.1.

See https://github.com/toedter/spring-hateoas-jsonapi

Release Notes: https://github.com/toedter/spring-hateoas-jsonapi/releases/tag/v3.0.1

#java, #rest, #spring, #hateoas, #jsonapi

Alt...

json:api for spring hateoas

I broke down Event Sourcing in Quarkus using Java records, sealed types, pure functions, and a clean CQRS split.

Fully hands-on. No magic. Just data, folds, and clear architecture.
If you want to understand event sourcing without the hype, this one is for you.

👉 https://www.the-main-thread.com/p/event-sourcing-quarkus-java-records-cqrs-tutorial

#Java #Quarkus #EventSourcing #CQRS #DataOrientedDesign

We are happy to have JUG Amsterdam back as a partner of #JCON2026!

For all #JUG members we offer 1,000 free #JavaUserGroup tickets!
First come, firste serve!
#JCON #Java

Free JUG ticket: https://pretix.eu/impuls/europe2026/c/lGD4ytbW1/

Become a partner JUG: jcon.koeln/#partner

Happy Holidays!

Here is a late present for you: We just released Version 6.0.alpha4.
This release contains a couple of UX improvements, a handful of new features, and the usual bug fixes.
A brand new feature is now the support for date groups based on any date field. Also supports year, timestamp fields, etc.

For more info, check out our blog post and the changelog!

https://blog.jabref.org/2025/12/26/JabRef6-0-alpha4/

#javafx #java #academia #opensource #bibliography #biblatex #bibtex #texlaTeX
@foojay @frankdelporte

Alt...

Screenshot of the JabRef dialog group dialog showing the configuration options for date groups

Merry Christmas to all who celebrate and thanks for all your support!
Have a wonderful holiday season!
🎄🎅🏻
www.the-main-thread.com

#java

🎄 Our #Christmas gift to the #Java #community: The #JCON EUROPE 2026 schedule is LIVE!

#Browse the lineup, #bookmark your must-sees, and get ready for #code on the big screen-vibes + #hallwaytrack magic.
🎬 Apr 20–23 in #Cologne at #Cinedom

https://schedule.jcon.one/2026/
#JCON2026

JEP 500 prepares the Java ecosystem for final field integrity in JDK 26 by restricting deep reflection mutations - closing a long-standing loophole in the platform.

What's new:
• Enhances safety & performance
• Stricter encapsulation
• Introduces developer warnings when mutations are attempted

Find out more: https://bit.ly/3MPYTUL

#Java #JDK26 #JEP #InfoQ

🎄 Advent of Donations - Day 21 🎄

On day 21 we have the first project from the Java ecosystem. And it's with no doubt the most important project for the JVM: @junit I use it for testing in every JVM project that I work on.

Read more about Advent of Donations and JUnit in my latest blog update: https://britter.dev/blog/2025/12/01/advent-of-donations/#day-21---junit

#AdventOfDonations #java #testing #junit

Getting started with Java on the Raspberry Pi - UPDATE 2025: A lot of small and bigger examples to introduce you to Java, JavaFX, Pi4J, Spring, Queues... with hardware projects on the Raspberry Pi. https://leanpub.com/gettingstartedwithjavaontheraspberrypi by Frank Delporte is the featured book on the Leanpub homepage! https://leanpub.com #RaspberryPi #EmbeddedSystems #Java #Messaging #HomeAutomation #InternetOfThings #Software #Diy

Find it on Leanpub!

Early Xmas gift 🎄

The new Spring Boot Buildpack adds support for AOT Caching.
This long-awaited feature is expected to replace App CDS and is supported in Java 25.

I already had a look, and it is excellent. My apps are starting now much faster!

https://github.com/paketo-buildpacks/spring-boot

#SpringBoot #Java

I just released version 3.0.0 of "JSON:API for Spring HATEOAS". This is a major release with dependency updates to Spring Boot 4.0.0, Spring HATEOAS 3.0.0 and Jackson 3.

See https://github.com/toedter/spring-hateoas-jsonapi.

Version 3.0.0 removes all deprecated APIs from version 2.x.x. See the Migration Guide for details: https://toedter.github.io/spring-hateoas-jsonapi/3.0.0/reference/#migration-3-0-0

#java, #rest, #spring, #hateoas, #jsonapi

Alt...

json:api

GraphQL with Java and Spring https://leanpub.com/graphql-java by Andreas Marek and Donna Zhou is the featured book on the Leanpub homepage! https://leanpub.com #Java #books #career #technology

Learn first-hand from the founder of GraphQL Java and co-author of Spring for GraphQL how to develop GraphQL services in Java.

Find it on Leanpub!

With #SpringFramework 7.0.2 out today (https://spring.io/blog/2025/12/11/spring-framework-7-0-2-available-now), and #SpringBoot 4.0.1 out in 1 week, I guess I'll wait a bit to upgrade my projects.

Which is good, cuz I want to get my #Java #EventSourcing projection code complete before I embark on Upgrading All The Projects.

Big Kotlin pack https://leanpub.com/b/kotlin_mm by Marcin Moskała is the featured bundle of ebooks 📚 on the Leanpub homepage! https://leanpub.com #Kotlin #Android #Java #ComputerProgramming #Engineering

The following 5 books are included in this bundle...
Kotlin Essentials, Functional Kotlin, Advanced Kotlin, Kotlin Coroutines, and Effective Kotlin

Find it on Leanpub!

Hands-On Java with Kubernetes https://leanpub.com/hands-on-java-with-kubernetes by Piotr Mińkowski is the featured book on the Leanpub homepage! https://leanpub.com #Java #Kubernetes #SoftwareEngineering

Build. Deploy. Scale.

Find it on Leanpub!

My Twitch #Java live coding schedule this week is today (Monday), Wednesday, and Thursday starting at 8pm UTC.

Probably won’t stream on Tuesday so I can do final prep for my Testable Architecture talk on Wednesday.

https://jitterted.stream is the place!

I just released version 2.2.0 of "JSON:API for Spring HATEOAS". This is a minor release with 2 new features and dependency updates to Spring Boot 3.5.8.

See https://github.com/toedter/spring-hateoas-jsonapi

#java, #rest, #spring, #hateoas, #jsonapi

Alt...

json:api

I'll be adding this article (and enriching my talk on the topic) to my list of references. If you're interested in learning about event-sourcing from scratch (esp. in #Java), check out my Ted talk: https://ted.dev/talks/#event-sourcing-from-scratch-online-zoom-talk-(november-25%2C-2025)

New 📚 Release! Java Programming: Beginner to Intermediate by Gerry Byrne & David Wilson

Java Programming: Beginner to Intermediate is the ultimate resource for anyone who wants to learn Java fast and build real programming skills. Whether you’re a complete beginner, a career changer, or someone refreshing their knowledge, this book is designed to help you succeed.

Find it on Leanpub!

Link: https://leanpub.com/javaprogrammingbeginnertointermediate

#books #java #programming #javaprogramming #softwaredevelopment

On my #Java live coding stream today, when implementing the JDBC implementation of my Event Store, I talked about doing #TDD for Discovery and Design (learning about what the desired behavior should be), vs. implementing a known behavioral specification.

https://jitterted.stream

Instead of buying stuff during Black Friday that I don’t really need, I’m sponsoring open source #Java projects that I rely on. Today's donation is to Tatu Saloranta, the authot of the #Jackson JSON library (among other things!).

https://github.com/sponsors/cowtowncoder?sp=tedyoung

Instead of buying stuff during Black Friday that I don’t really need, I’m sponsoring open source #Java projects that I rely on. Today's donation is to the Apache Software Foundation, my longtime companion throughout my career. #Maven is still my go-to build tool!

Yay, one big step closer to the release of #IntelliJIDEA 2025.3! Check out the release candidate: https://blog.jetbrains.com/idea/2025/11/intellij-idea-2025-3-release-candidate/

#Java #JDK25 #Junit6 #SpringBoot4

Instead of spending Black Friday buying stuff I don’t really need, I’m sponsoring open source #Java projects that I rely on. Next up is SDKMAN! (https://sdkman.io). While I don’t use it as often as JUnit or AssertJ, it helps me manage my huge variety of JDKs installed.

Testing Spring Boot Applications Demystified by Philip Riecks is free with a Leanpub Reader membership! Or you can buy it for $9.00! http://leanpub.com/testing-spring-boot-applications-demystified #Java #Testing #AutomatedSoftwareTesting

Hey there! I'm hiring an EM to help lead our JVM Ecosystem team! From build time to run time, this is an opportunity to work with some really awesome engineers on the lowest levels of the #Netflix stack.

My DMs are open!

#java #JVM

https://explore.jobs.netflix.net/careers/job/790312532064?microsite=netflix.com

Instead of buying more stuff that I don’t really need, I’m sponsoring open source #Java projects that I rely on, starting with #JUnit and #AssertJ (via core maintainers Joel and Stefano).

If I was a big company using Java, I’d be embarrassed at not sponsoring these projects.

#Tokyo

An amazing #city

The largest city in the world

...Not anymore

"With an estimated population of nearly 42 million residents, #Indonesia's capital #Jakarta soared from 33rd place to surpass #Japan's Tokyo, according to a new #UnitedNations report"

A mind boggling fact for you:

The population of #Java is about 155 million

The population of #Russia is about 145 million

Java is about 2/3 the size of #GreatBritain!

That's what rich volcanic soil does

https://www.nbcnews.com/world/rcna245798

#cities

Big Kotlin pack https://leanpub.com/b/kotlin_mm by Marcin Moskała is the featured bundle of ebooks 📚 on the Leanpub homepage! https://leanpub.com #Kotlin #Android #Java #ComputerProgramming #Engineering

The following 5 books are included in this bundle...

Kotlin Essentials, Functional Kotlin, Advanced Kotlin, Kotlin Coroutines, and Effective Kotlin

Find it on Leanpub!

My online talk on Tuesday, Nov 25 at 6pm UTC is my #Java based "Event-Sourcing from Scratch" talk. Details and _free_ registration at https://luma.com/dt9fc391

Join live to ask questions, or watch for the recording later.

Event Sourcing is the storing of state-changing decisions made within a part of the domain.

(noodling with my intro for my upcoming talk on event sourcing: https://luma.com/dt9fc391)

#EventSourcing #Java

Spring Boot 4.0 is out, upgrade and enjoy Boot modularization, portfolio-wide null-safety, first class support for Java 25, API versioning for web applications and more! https://spring.io/blog/2025/11/20/spring-boot-4-0-0-available-now

#spring #java

Java Clean Code Fundamentals https://leanpub.com/b/javacleancodefundamentals by Martin Hock is the featured bundle of ebooks 📚 on the Leanpub homepage! https://leanpub.com #ComputerProgramming #Java

Find it on Leanpub!

IntelliJ IDEA 2025.3 Beta has been published, it provides first class support for JSpecify nullability annotations that are used in Spring Boot 4.0 which will be released today. https://www.jetbrains.com/idea/nextversion/

#java #spring

#rust I now have code that gives me a list with 24 time zones, one for each full-hour offset from UTC. It's not nice, but my #Java version wasn't nice either (https://codeberg.org/dtanzer/tzsh/src/branch/main/java).

I'll push the rust version when at least a few things work.