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New blogpost: Learn how to build JDK 21 and JDK 25 with the HotSpot Disassembler (HSDIS) plugin enabled for Linux. `hsdis` is a tool to inspect the JVM’s JIT-compiled assembly code, and this post explains how to configure it: 🔗jjfumero.github.io/posts/2025/02/… #java #disassembler

Today I have delivered my rather geeky talk about advancing Java profiling at JavaOne speakerdeck.com/jbachorik/java… (recording will be available ~soon) Thanks to the audience for bearing with me and I hope I brought something interesting up. #java #javaone #jvm #performance #profiling

vibe coding, where 2 engineers can now create the tech debt of at least 50 engineers

Heading home this morning after my first JavaOne. What a week of learning and connecting with new and old friends. I’m inspired to go home and do more for this community I hold in such high regard. Thank you to everyone who helped put on an amazing conference 🤩

Meet the LOCAL open source Robot from EngineAI. Shiqin Dai and his team of less than 100 is already shipping and has back orders. Price: $13,000 Target price $8,000 Can do some house chores, walk the dog, carry items from the car oh and can choreograph dance moves…

Join us and ask all your. NET memory-related questions!

Aaand, it’s a wrap. After long wait we had a really lovely JavaOne this year. Really enjoyed it a lot. Huge thanks to all the organizers, participants and Oracle for having it at its premises. @sharat_chander, great job!

🌎 45 Countries represented ☕ 900 Cups of specialty coffee served 🏎️ 300 Oracle Red Bull Racing Simulator laps 📸 20,600 Stickers Thank you to everyone who attended #JavaOne 2025 and helped make it a HUGE success! Until next time. ✌️

TIL that with libc MUSL x86_64 if you do signal based profiling and you land in a syscall, there is 'trampoline' involved which effectively removes any chance of unwinding behind that trampoline (SP and FP is gone and garbage).

Debugging HotSpot is fun. Could not understand why is_in_asgct() returned false when _in_asgct was explicitly set to true. Turns out JavaThread has TWO different fields with exactly the same name (one of them in the parent class). bugs.openjdk.org/browse/JDK-835…

JEP 509 ("JFR CPU-Time Profiling (Experimental)") added. See openjdk.org/jeps/509

JEP 8325147 ("Ahead-of-Time Method Profiling") updated: Status changed from "Draft" to "Submitted". See openjdk.org/jeps/8325147

I was recently asked why we do not teach students to write code in Python... completely skipping the perils of memory management and pointers. Some prestigious computer science departments have taken this route. A cynical voice in my head warns that it is because the professors

pattern matching instanceof defines a variable in the outer scope not just the inner scope

Self optimization with just two rules: Attract Repulse Systems do not take much to prosper. Order out of chaos.

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…

JEP 509 ("JFR CPU-Time Profiling (Experimental)") updated: Status changed from "Candidate" to "Proposed to target for version 25". See openjdk.org/jeps/509

TIL: Since #Java 9, AtomicBoolean has a setPlain() method for "plain write access", which effectively lets you use an AtomicBoolean as a simple, mutable boolean holder in lambda expressions without feeling so bad about having done so. 😎

These days, lot of OpenJDK Loom fun: github.com/franz1981/Nett… Do you know that VT schedulers are inherited? Which means that if you have your own and clinit some Key OpenJDK class, u risk to make your scheduler to leak into some JDK class (!)

JEP 509 ("JFR CPU-Time Profiling (Experimental)") updated: Status changed from "Proposed to target for version 25" to "Targeted for version 25". See openjdk.org/jeps/509