Johannes Bechberger

When you come to the Java 26 talk, a custom-made "Java 26 is boring" shirt could be yours if you win our quiz.

Looking forward to seeing you again :)

The Simpsons - “Boring” YouTube video by AreaEightyNine

See www.youtube.com/watch?v=I6vy...

The submissions will be treated anonymously. Please send them our way at cap.in.the.pocket@gmail.com

I need your help: If anyone wants to send me an audio snippet saying "Boring" (as in "Java 26 is stable. It's boring."), I would happily accept them. I want to play this audio via a button press during a talk.

In other news: I'm speaking at @amsterdam.voxxeddays.com with @lutskedev.bsky.social.

I was in the talk and can confirm: I never learned so many things about Llamas (crias...).

Redacting Data from Heap Dumps via hprof-redact - Mostly nerdless Java Heap Dumps might contain sensitive information, with hprof-redact you can easily remove it. Learn more in this blog post.

Java Heap Dumps might contain sensitive information; with hprof-redact, you can easily remove it. Learn more in this blog post: mostlynerdless.de/blog/2026/02...

Femtocli: A small but mighty CLI library for small CLI tools in < 45KB - Mostly nerdless Command-line parser libraries don't have to be big to support everything you need: Introducing femtocli, which is smaller than 45KB.

Command-line parser libraries don't have to be big to support everything you need, like subcommands, validators, and Java-agent-style argument parsing: Introducing femtocli, with a 45KB JAR file.

Read more at mostlynerdless.de/blog/2026/02...

Redacting Sensitive Data from Java Flight Recorder Files - Mostly nerdless Redact sensitive data from Java Flight Recorder and JVM crash logs with jfr-redact, a tool for safely sharing profiling and error files.

Redact sensitive data from Java Flight Recorder and JVM crash logs with jfr-redact, a tool for safely sharing profiling and error files:

mostlynerdless.de/blog/2026/02...

Do you know the book "Street-Fighting Mathematics"? It is similar

streetfightingmath.com

Guess the Java version of a code snippet in this fun game A game that let's you guess the Java version of snippets, from Java 1.0 to Java 25

Think you really know Java? ☕
Guess the Java version from code snippets in my Java Version Quiz: mostlynerdless.de/java-game/

In this week's blog post, I explain how a chaotic eBPF-based scheduler helps reproduce rare concurrency bugs, illustrated with a real-world OpenJDK case: mostlynerdless.de/blog/2026/01...

"Align the syntax of a formal parameter declaration in an implicitly typed lambda expression with the syntax of a local variable declaration." (from the openjdk.org/jeps/323)

A tiny puzzler: Is this valid Java?

import java.util.function.Predicate;

public class Test {
Predicate<String> f = (var a) -> a.isEmpty();
}

Thanks :)

No, because I only analyse the used Java syntax, so I don't need to build the projects. I just need to parse the Java code.

I'm just trying to analyze which Java features existing libraries use. The plan is to implement a tiny code analysis for a (hopefully) upcoming talk.

I'm not looking for small projects, so kestra is good

I'm looking for suggestions for modern open-source Java applications and libraries for a code analysis project

Async-profiler has released an update that includes native lock profiling and a latency filter. Consequently, ap-loader, which wraps async-profiler in a platform-independent JAR, has also been updated: github.com/jvm-profilin...

Reading and Writing JFR Files Programmatically - Mostly nerdless JFR is great, but do you know how to read and write JFR files programmatically? Learn more in this week's blog post.

JFR is great, but do you know how to read and write JFR files programmatically? Learn more in this week's blog post: mostlynerdless.de/blog/2026/01...

I just released a new version of the cf-cli-java-plugin (github.com/SAP/cf-cli-j...), which solves a rare ssh connection issue by not using the plugin framework to call "cf ssh", but calling it directly via exec.Command

I have just released version 4.2.1-11 of ap-loader, which combines the 4.2.1 async-profiler maintenance release with a bug fix related to --jfr-sync in ap-loader itself. Get it via Maven or from the GitHub releases: github.com/jvm-profilin...

It will be a story of blood, sweat, and C++. I'm currently writing the first draft of the storyline. The first part of the talk will cover profiling, followed by an introduction to the new sampler (and why it's a good one), and will conclude with how I integrated the profiler into OpenJDK.

It will probably be one of the most in-depth views into how a feature turned from idea to code in four years. With all the ups and downs.

Java 25 got a new CPU time profiler, get into the details and the journey to get there in my talk at @jfokus.se early February: jfokus.se

The Fastest Way to get the Version of a Java Installation - Mostly nerdless Learn how I built the java-version to replace "java -version" and get you the version of a Java binary in less than a millisecond.

After last week's blog post that showed you how OpenJDK is faster than GraalVM, this week you will learn the quickest way to obtain the version of a Java binary (hint: it runs in less than a millisecond): mostlynerdless.de/blog/2026/01...

But the slight mislead apparently worked.

I updated the SEO description :)

... and so many different topics