I evaluated CPU & memory consumption of Leyden & GraalVM Native Image for a simple javac benchmark. Native Image is still much faster than Leyden for short workloads but GraalCE can be 2x slower for longer runs & only GraalEE with G1 & PGO beats HotSpot: github.com/simonis/Leyden…

Project Leyden Ships Third Option for Faster Application Start with JEP 483 in Java 24 bit.ly/3DKUUom by Karsten Silz

And the old group coordinator implementation is gone from Apache Kafka - love it when open-source projects can delete large chunks of complex code. github.com/apache/kafka/p…

Looks like Bazel is looking to enable compact headers when using the embedded JDK: github.com/bazelbuild/baz… cc Roman Kennke 🗽

IO_uring Network Zero-Copy Receive Lands In Linux 6.15 phoronix.com/news/Linux-6.1…

"This speeds up some Loom operations by almost an order of magnitude (and similarly for CompletableFuture). Further incremental improvements may be possible, but delay scheduling overhead is now unlikely to be a common performance concern." github.com/openjdk/jdk/pu…

I am excited to finally announce the release of #netty 4.2.0.Final which is in the making for quite some time! This release comes with a lot of new exciting features, including the highly anticipated #io_uring support. See netty.io/news/2025/04/0…

Proud to have contributed formal verification (TLA+) for three key improvements in Kafka 4.0: ✅ KIP-966: Strengthens the replication protocol. ✅ KIP-996: Introduces PreVote for more stable KRaft leadership. ✅ KIP-848: Delivers more efficient, predictable rebalancing.

Async-Profiler v4.0 Heatmaps and Native memory profiling and VMStructs-based stack walker github.com/async-profiler…

Yesterday Async-profiler 4.0 was released. One of the new feature is "native memory profiling". One of the use case is finding native memory leaks. More on that topic in my new article: krzysztofslusarski.github.io/2025/03/31/nat…

Looks like the experimental tag is being removed from Compact Object Headers in Java 25 github.com/openjdk/jdk/pu…

Cute edge case allowed by javac (the PR fixes it) github.com/openjdk/jdk/pu…

The super power of var-handles in the JVM for the upcoming value types world :-) cr.openjdk.org/~jrose/values/… "Java for the AI world" #java #Valhalla #ValueType

Scoped Values to be finalized in Java 25 openjdk.org/jeps/506

Are you curious to see how Netty 4.2 with io_uring perform with a novel integration with Virtual Threads? Check techempower.com/benchmarks/#se… :)

Java 25 will have built-in HTTP/3 client support github.com/openjdk/jdk/pu…

A taste what is already delivered and what is coming to JDKs with Project Leyden. The warmup curve for javac compile tasks clearly improve the further you go into the AOT woods.

JFR is getting a new method sampler that walks stacks at safepoints in JDK 25. Learn all about the new sampler in this week's blog post: mostlynerdless.de/blog/2025/05/2…