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foojay is a place for friends of OpenJDK, providing free, reference materials and blogs for daily Java usage.

Ever wonder how the JDK Flight Recorder (JFR) keeps track of the classes and methods it has collected for stack traces and more? In this …

DevPod is a nice tool around your toolbelt that allows your development team(s) to share the same machine configuration without hassle.

See how to implement a declarative API with Spring AOP and SpEL to perform tasks belonging to cross-cutting concerns like auditing.

Foojay Podcast #66: Let's Talk About Java Code! Diving into a few Foojay blog posts...

After working on a new online Spring Data Neo4j course, I learned a couple more things about updating an entity.

Build a sliding window log rate limiter with Redis and Java. Track requests in a rolling window, expire old entries, and test your setup for …

On Thursday, March 13, Azul is hosting a virtual celebration of 30 years of Java, starting at 09:00 PST / 17:00 GMT / 18:00 CET.

Here is the first overview of the JavaFX LinksOfTheMonth for 2025. You can find the weekly lists on jfx-central.com. Did we miss anything? …

In my previous company, I developed a batch job that tracked metrics across social media, such as Twitter, LinkedIn, Mastodon, Bluesky, …

The problem of some Kubernetes objects: they are cluster-wide and lock all teams working on the same cluster to use the same version.