This is the first of me new blog series on Functional Optics for Modern Java. We start off with The Immutability Gap: Why Java Records Need Optics https://blog.scottlogic.com/2026/01/09/java-the-immutability-gap.html
#Java #FunctionalProgramming #Optics

Today is the first day in my life I'm running a Maven build in the debugger to examine a build failure. A Maven plugin had thrown an exception with a mostly useless message. Unfortunately, the original exception was wrapped in such a way as to hide the root cause (running with -e was not enough to expose it).

Things I learned on the way:
- IntelliJ IDEA supports running Maven in the debugger.
- IntelliJ does not support loading the sources (or the decompiled code) of the Maven plugins debugged in this way or to set line breakpoints.
- You can set method breakpoints manually by specifying the class and method names, and they actually work in this setup.
- IntelliJ then shows the stack trace and allows you to inspect the stack frame, but does not show the corresponding code. I had to look at the class names and line numbers in the stack trace, open the sources, and navigate there by hand – and follow along by hand while stepping through the program.
- Running the build in the debugger is awfully slow (giving me the time to write this). It took about half an hour to get to the interesting point (vs. 4.5 minutes when not debugging), and I'm still waiting for the exception to occur.

An interesting experience so far – but not one I would want to repeat often. 😅

#Programming #SoftwareDevelopment #Java #Maven #IntelliJ #Debugging

Here is the new #JavaFX #LinksOfTheWeek, published on https://www.jfx-central.com/links.

Thanks to
Patrik Karlström
Kawsar Technologies
iifx.dev
Matt Coley

Happy reading, and have a lovely #Java weekend!

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The new year brought some unexpected news: I've been impacted by a restructure at Broadcom.
Now open to new opportunities as a Senior/Staff Java Developer (remote from Madrid).
Happy to connect if there’s a potential fit.

👉🏼 https://www.linkedin.com/in/ivanlopezmartin/

#OpenToWork #Java #RemoteJobs

The 3rd edition of of my software design textbook is just out:

https://link.springer.com/book/10.1007/978-3-032-11821-9

I'm also updating the companion website with new and revised exercises and solutions:

https://github.com/prmr/DesignBook

BTW the text is 100% genuine. Not a single sentence was generated with AI, and this includes no autocomplete and no grammatical "suggestion". My only writing tool is the good ol' spellchecker.

#softwareDesign #Java #softwareEngineering #noai

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Cover of the book "Introduction to Software Design with Java" by Martin P. Robillard, showing an abstract blue pattern.

Stratospheric - From Zero to Production with Spring Boot and AWS: Hands-on online course to learn all you need to know to get a Spring Boot application into production with AWS. https://leanpub.com/courses/leanpub/stratospheric by Philip Riecks, Björn Wilmsmann, and Tom Hombergs is the featured course on the Leanpub homepage! https://leanpub.com #AmazonWebServices #Java #SoftwareArchitecture #SoftwareEngineering #CloudComputing

Looking forward to my appearance at the JChampions Conference this year. 🚀

Many strong talks in the pipeline, and participation is completely free.

Conference: https://jchampionsconf.com
Live streams: https://www.youtube.com/@JChampionsConf/streams
Tickets: https://www.eventbrite.com/e/jchampions-conference-online-tickets-1977195901165

#Java #JChampions

Angenommen ich habe hier ein altes #java #swing (#awt ?) Projekt von ca. 2006 und grundsätzlich spiele ich mit dem Gedanken das Zeug einfach mal aus eigenem Interesse etwas näher an den #stateoftheart zu bringen - was wäre das denn eigentlich aktuell?
#kotlin? #gradle? #maven?

Fällt mir gerade echt schwer mich hobbymäßig (!) ins JDK-Universum einzulesen nach knapp 10-15 Jahren #dotnet #ruby und so - das bisschen Java im Studium führte eher zu Verwirrung 😬

Bin für jede Starthilfe dankbar <3

Creating AI Agents with MCP - Model Context Protocol: Part of the series, "The Only Book You'll Need On..." https://leanpub.com/mcp by Lydia Evelyn and Bruce Hopkins is the featured book on the Leanpub homepage! https://leanpub.com #Ai #Python #Postgresql #Javascript #Java

Get started quickly, creating applications for the Model Context Protocol (MCP) using the official MCP SDKs for Python, Java 21, and Node.js.

Find it on Leanpub!

Here is the first #JavaFX #LinksOfTheWeek for the new year, published on https://www.jfx-central.com/links.

Thanks to
@jabref
LogoRRR
Mapton
@dlemmermann
Lee Wyatt
@foojay
Vlad Protsenko
Matt Coley
Craig Raw
Florian Enner
Carl Dea

Happy reading, and have a lovely #Java weekend!

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2025 was a great year for #Spring and #Java

https://spring.io/blog/2025/12/30/this-year-in-spring-december-30th-2025

Yesterday, on my live coding #Java stream, I spent some time (more than I expected) creating some very rough benchmarks for my #EventSourcing example app, JitterTicket.

I had #Junie write a data generator to create 100 concerts, 1,000 customers, each buying 2-4 tix per concert.

2026: The Year of Java in the Terminal

https://xam.dk/blog/lets-make-2026-the-year-of-java-in-the-terminal/

#HackerNews #Java #Terminal #2026 #JavaProgramming #TechTrends #DeveloperCommunity #HackerNews

Quickly Inspect your Java Application with JStall
https://mostlynerdless.de/blog/2025/12/30/quickly-inspect-your-java-application-with-jstall/
#java

Java as a scripting language?
Yes. And it’s actually good now.

I just published a hands-on guide to JBang: single-file Java, instant execution, inline deps, real CLI tools, even Quarkus APIs.

If you’ve ever wished Java “felt faster,” this one’s for you.
👇
https://www.the-main-thread.com/p/jbang-java-scripting-tutorial

#Java #JBang #Java21 #DeveloperExperience #Quarkus

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

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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

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

#java

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

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

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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.

Habe mal wieder einen Ausflug ins Backend gewagt und für das #JavaMagazin "Modularisierung pragmatisch – Anwendungen mit Spring Modulith" geschrieben.

👉 https://nilshartmann.net/a/spring-modulith-java-magazin

Viel Spaß beim Lesen... und beim Modularisieren 😊

#Java #Spring #SpringBoot #SpringModulith

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Architecture diagram showing modules of the example application

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Screenshot of VS Code showing an error message "Invalid reference to non-exposed type of module 'Inquiry'"

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Screenshot of IntelliJ's package explorer with annotated modules from Spring Modulith

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

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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

🚀 #ApproveJ v1.0 ("ONE-POINT-ZERO") was just released! 🎉🥳🍾

🧹 all deprecated methods have been removed
🪲 approving by file is now also possible in parameterized tests
📖 minor updates in the manual

https://github.com/mkutz/ApproveJ/releases/tag/v1.0

#approvaltesting #snapshottesting #java #kotlin #unittesting #release

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Release banner for v1.0

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!