Maarten Mulders on foojay.io - Friends of OpenJDK

Announcing: Sustainability for Java Developers

Mon, 02 Feb 2026 11:04:54 +0000

Java developers from around the world are writing a book about a question that’s becoming impossible to ignore: how do we write software that’s good for both our projects and the planet?

Sustainability for Java Developers: Towards an Understanding of Sustainable Java Software Development is now freely available on Leanpub, bringing together Java Champions, architects, and technical writers to look at sustainability from every angle.

The book covers everything from the environmental footprint of our data centers to the ethics of open source supply chains, from efficient data formats to the often-overlooked topic of career longevity.

Foojay Podcast #81: Maven 4 - The Future of Java Build Automation

Mon, 03 Nov 2025 06:03:12 +0000

Maven 4 is approaching its release, bringing many improvements to the build tool powering millions of Java projects.

In this Foojay Podcast episode, we talk about Apache Maven 4, a significant milestone that has been years in the making. Maven has been the backbone of Java dependency management and build automation since the early 2000s; however, the road to version 4 has been a long and deliberate one. With significant performance improvements, a modernized API for plugin developers, and changes that affect how we think about project structure, Maven 4 represents both an evolution and a revolution. What does this mean for the millions of developers who depend on Maven daily? How should teams prepare for the transition? And what’s the story behind the Maven Central Repository changes that have been making headlines? To answer these questions and more, we’re joined by a few of the many contributors who are actually building Maven 4 and stewarding its ecosystem.

Foojay Podcast #19: Working Free For Fun Brings Fame & Fortune

Mon, 17 Apr 2023 12:35:51 +0000

Many developers spend a lot of their time on side projects. It’s an opportunity to learn new techniques and get involved in communities.

But sometimes it can also lead to a new job.

Or even starting a business based on such a project.

Today we are talking to people who achieved such a transition and became famous and rich, or at least some of each…

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Use git bisect to Pinpoint a Bug

Wed, 23 Feb 2022 14:44:51 +0000

During some recent work on Maven, I found a very specific bug. The error message wasn’t that clear, and I couldn’t make a guess what might’ve caused it.

I had read about git bisect a few times and figured that this time, I would use that tool to find the bug.

So what does git bisect do? It helps you find the exact commit that introduced a bug, using binary search.

Introduction to Maven Toolchains

Tue, 25 Jan 2022 08:20:47 +0000

Java evolves at a much faster pace than it used to do.

But not all of the projects we work on keep up with that pace.

I have projects on Java 8, 11, and 17 and sometimes I want to play with early access builds of newer versions as well.

How to make sure I can build them without having to constantly switch Java runtimes?

Switching Java versions the whole day long

Switching Java versions on the command line doesn’t have to be hard . In my case, it’s as easy as typing j8, j11, j17. But doing that every time you’re seeing that “release version 17 not supported” is a bit tedious. More importantly, it doesn’t solve the root cause of the issue.