Flaky GitHub Pull Request builds are an annoying reality in many projects. Just when you think a change is complete and good to merge, you are greeted with an ❌. To unblock your PR, you need to rerun lengthy test pipeline just because of one rogue test.

If you have a Java project on GitHub, TestLens can help you:

https://testlens.app/blog/2027/05/07/reuse-test-results/

Drop me a message, if you would like to join or beta program.

#Java #JUnit #Gradle #Maven #GitHub

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TestLens control buttons in a comment on your GitHub Pull Request. They offer a 'Only rerun the tests that failed or were muted before' checkbox to activate before triggering a rerun through the 'Rerun job' checkbox.

If you deleted all assertions, would your coverage drop? Probably not by much, and that’s the problem. Julius Mischok explains why #PIT mutation testing is the missing layer on top of JaCoCo.

Test your tests with PIT: https://javapro.io/2026/01/21/test-your-tests-mutation-testing-in-java-with-pit/

#Java #TDD #MutationTesting #JUnit5

Do you love a good mystery? Do you know what the type "java.util.Collections$2" is in #Java? I didn't know until I blogged about it.👇

In my latest blog, I explain this and other mysterious class names you may encounter in Java.

Thanks for reading! 🙏
https://donraab.medium.com/what-if-java-consistently-used-intention-revealing-names-for-types-7b9cbc39f65f?source=friends_link&sk=38d28dba7f021f2bcf7f41378e6600e8

Spring Boot 4.1 allows to filter which Internet addresses an application is allowed to call - nice additional protection that everyone should include:
https://docs.spring.io/spring-boot/4.1-SNAPSHOT/reference/io/rest-client.html#io.rest-client.global-configuration.inetaddress-filtering

#java #spring #springboot #security

Targeted to JDK 27: JEP 532: Primitive Types in Patterns, instanceof, and switch (Fifth Preview): https://openjdk.org/jeps/532 #jdk27 #openjdk #java

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

Thanks to
@hansolo_
Street_Humor_7861
Striking_Creme864
@dlemmermann
BabyDevCode
Artur Skowroński
@foojay

Happy reading, and have a lovely #Java weekend!

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Proposed to target JDK 27: JEP 531: Lazy Constants (Third Preview): https://openjdk.org/jeps/531 #jdk27 #openjdk #java

Big Kotlin pack by Marcin Moskała is the featured bundle of ebooks 📚 on Leanpub!

Link: https://leanpub.com/b/kotlin_mm

#kotlin #android #java #computer_programming #engineering

A Short Guide to Naming: Understand how and why to better name modules, classes, functions, and variables. by Tim Ottinger is the featured book 📖 on Leanpub!

if you've read my chapter on naming in a famous software book (first or second edition) you may want to go a little deeper. Same author, same topic, all-new content!

Link: https://leanpub.com/naming_shortguide

#computer_programming #python #javascript #java #web_development #refactoring

A Short Guide to Naming by Tim Ottinger is free with a Leanpub Reader membership! Or you can buy it for $5.00! https://leanpub.com/naming_shortguide #computer_programming #python #javascript #java #web_development #refactoring

Great series of articles about Ecotone, a PHP #EventSourcing library (framework?), and this one about projections was nice to read as it confirms my current implementation (and/or design) in my ES library for #Java.

https://blog.ecotone.tech/when-one-worker-cant-keep-up-scaling-projections/

Design Patterns in Modern Java by Jitin Kayyala is a new release on Leanpub!

Link: https://leanpub.com/designpatternsinmodernjava

#books #ebooks #newreleases #leanpublishing #selfpublishing #java

What you need to know about MCP servers - with Java and spring-boot by Peter Isberg is a new release on Leanpub!

Link: https://leanpub.com/wyntka-mcpservers-withjava

#books #ebooks #newreleases #leanpublishing #selfpublishing #java

Check out what the awesome @teapot418 sent me.

Paper cheat sheet to complement my talk "Painless organisation and maintenance of Apache Maven Builds" that I will give tomorrow @jcon

Check it out

👉 https://schedule.jcon.one/2026/session/1051725

#java #maven #JCON2026

Exploring Java Libraries: A Developer's Guide (Volume 2): Advanced Text Processing, AWT, Swing GUI, and Accessibility in Java by Solis Dynamics is a new release on Leanpub!

Link: https://leanpub.com/java-libraries-guide-2

#books #ebooks #newreleases #leanpublishing #selfpublishing #computer_programming #software #java #software_architecture

Compose & Android Deep Dive Package (Jetpack Compose internals + Manifest Android Interview) by Jaewoong and Jorge Castillo is the featured bundle of ebooks 📚 on Leanpub!

Link: https://leanpub.com/b/android-deep-dive-package

#computer_programming #android #kotlin #engineering #software #software_engineering #software_architecture #java

Jetpack Compose internals by Jorge Castillo is on sale on Leanpub! Its suggested price is $49.99; get it for $17.50 with this coupon: https://leanpub.com/composeinternals/c/LeanPublishingDaily20260416 #Software #ComputerProgramming #Java #Kotlin #SoftwareArchitecture

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

Thanks to
Steve Hannah
Viktor Karpyuk
Striking_Creme864
Catherine Edelveis
Johannes Rabauer
Ryan Jarvinen
Olivier Pillods

Happy reading, and have a lovely #Java weekend!

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More live coding #EventSourcing in #Java notes...

This stream was working on the new Projector design, with some good discussion around Concurrency and Consistency.

Also demonstrated my "Reverse Olive Test Maneuver" 🫒

https://ted.dev/articles/2026/04/15/live-coding-journal-apr-15-2026/

RE #JSpecify and #Nullaway…

This #Maven plugin works as promised, nice:

https://github.com/making/nullability-maven-plugin

#Java

I published the first release of MelodyMatrix, a #JavaFX desktop app that lets you experience music in a new way with real-time MIDI recording, multiple visualization views, and powerful playback features. Together with Steve Hannah, the creator of #jDeploy, we finetuned the project and GitHub Actions to build V1.0.0 live on camera!

You can watch the full video on YouTube:
https://www.youtube.com/watch?v=_-IL7uHalIU

More information in this blog post:
https://webtechie.be/post/2026-04-16-first-release-of-melodymatrix-with-jdeploy/

#MelodyMatrix #Java #LookAtMusic

Someone should acquire #Sun^H^H^H Oracle Labs.

Or #Oracle should spin it out as a separate company.

I would love to see the #Graal ecosystem be an independent player in the Java/managed runtime space.

There is too much #Java value locked up in a company that seems to be competing with itself.

#InfoQ dives deep into #SpringFramework 7 & #SpringBoot 4 with the team behind the code.

🛠️ Key Focus: the shift toward core resilience by integrating features such as retry and concurrency throttling directly into the framework, alongside the performance benefits of modularizing auto-configurations.

🔗 Read now: https://bit.ly/3OIoz6W

#Java #AIcoding #Microservices #SoftwareDevelopment

New candidate JEP: 534: Compact Object Headers by Default: https://openjdk.org/jeps/534 #openjdk #java

Elegant Design Principles by Narayanan Jayaratchagan is free with a Leanpub Reader membership! Or you can buy it for $19.00! https://leanpub.com/elegant_design_principles_fsd #ObjectOrientedProgramming #ComputerProgramming #Java #SoftwareArchitecture #FunctionalProgramming

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

Thanks to
No-Security-7518
@leewyatt
@dlemmermann
Hidekazu Kubota
Daniel Harris

Happy reading, and have a lovely #Java weekend!

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So, #Microsoft says Co-Pilot is a tool for entertainment and the other #AI company nobody talks about sounds like this

> Generative AI tools, by their nature, make it easy to create large quantities of plausible-looking code, with plausible-looking tests, which is nonetheless incorrect or, even if it is correct, is poorly designed and therefore difficult to maintain.

This is from #Oracle in there “OpenJDK Interim Policy on Generative AI”

https://openjdk.org/legal/ai

#OpenJDK #Java #Doppeldenk

I'll be doing some of the work on my live coding stream on Fridays, starting April 10th at 12pm PDT (7pm UTC). That'll be a short, 1-hour stream, due to other commitments. Future streams will be ~3 hours and you'll be able to AMA on #Java, #Spring, etc.

https://jitterted.stream/

A Short Guide to Naming by Tim Ottinger is free with a Leanpub Reader membership! Or you can buy it for $5.00! https://leanpub.com/naming_shortguide #ComputerProgramming #Python #Javascript #Java #WebDevelopment #Refactoring

@xilerk Good catch! This command did the trick:

$ mvn -D versions.outputLineWidth=${COLUMNS} versions:display-dependency-updates

Of course, ${COLUMS} could be set to some arbitrary huge value to help better ensure single line per dependency.

Thanks a bunch for the suggestion! :-)

#Maven #Java #Programming

This is not easily parsed by machines (or even humans). Some version numbers are on the same line, others are on a separate line.

There's extraneous and unneeded info.

And there's no way to influence the appearance of the output. For example, the ps command as the -w flag to explicitly set wide text output mode.

#Maven #Java #Programming

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Screenshot of `mvn versions:display-dependency-updates`

My Java Modules with @ASFMavenProject (4) series continues!

Cleanly separate API and implementation in Java modules — and why mixing both is a common antipattern.

https://maven.aschemann.net/blog/2026/03/26/api-and-implementation/

#Java #Maven #JavaModules #ApacheMaven

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Blog Series about Java Modules with Maven 4: "Separating API and Implementation" — using dedicated modules and requires transitive in Java Modules with Maven 4. With a portrait of the author.

Another stream, another set of notes. So much "new"!

I try out a new design for Projectors, splitting EventConsumer into two pieces. Test-driving shows how it's about design exploration, not just writing tests.

https://ted.dev/articles/2026/04/06/live-coding-journal-apr-6-2026/

#Java #EventSourcing #TDD

Notes from my #Java #EventSourcing work, where I looked at event consumers that only get events they're interested in.

Struggled with Java's MethodHandle (docs could be better!), but otherwise works well.

Thoughts about Projector design.

Read more at: https://ted.dev/articles/2026/04/02/live-coding-journal-apr-2-2026/

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

Thanks to
PDFSam
@dlemmermann
@hansolo_
@foojay

Happy reading, and have a lovely #Java weekend!

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I wrote an article for JAVAPRO about the Foreign Function and Memory (FFM) API, added in #Java 22, and how it got used to add a new and better plugin to @pi4j

You can read it here:
https://javapro.io/2026/04/01/the-ffm-api-openjdk-changed-the-game-for-native-interactions-and-javaonraspberrypi/

#JavaOnRaspberryPi