Johannes Bechberger
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mostlynerdless.de
Johannes Bechberger
@mostlynerdless.de
OpenJDK hacker at SapMachine, works on hello-ebpf for fun
Having a last name that comes early when sorted alphabetically sometimes has its advantages:
November 13, 2025 at 7:09 AM
Sneak peek into my upcoming blog post:
August 22, 2025 at 10:22 AM
RIP Java Applets. You made Java popular and helped it grow to what it is today.

JEP 504: Remove the Applet API has been proposed to target (openjdk.org/jeps/504), so there will be no more applets with the next JDK (JDK 26).
July 7, 2025 at 2:53 PM
I just updated the JFR events collection (sapmachine.io/jfrevents). It now includes JDK 25 and JDK 26 with my CPUTimeSample event:
June 10, 2025 at 12:44 PM
June 4, 2025 at 10:10 PM
Well...
June 4, 2025 at 12:30 PM
I needed a QR code for a presentation and found nythrox.github.io/halftone-qrc.... It allows you to add a picture to your QR code in a few different ways.
May 28, 2025 at 12:52 PM
And in what outfit are you giving your talks?
May 13, 2025 at 10:31 AM
The good old days of console apps on your phone, it even supports touch:
May 8, 2025 at 12:47 PM
My favourite picture from @amsterdam.voxxeddays.com
April 8, 2025 at 2:33 PM
12 am is midnight @officialgrammarly.bsky.social :D
February 25, 2025 at 7:50 AM
When all you do is wait. Thanks to perf and @firefoxperformance.bsky.social FirefoxProfiler I found why my code didn't work (profiler.firefox.com/public/a6s9g...):
February 20, 2025 at 8:47 AM
February 19, 2025 at 2:29 PM
I had a missed connection in Frankfurt. So here's a picture of the empty upper level of the Frankfurt Airport train station at 7am
February 1, 2025 at 9:33 AM
On my way to @fosdem.bsky.social to give three talks today (see fosdem.org/2025/schedul...)
February 1, 2025 at 3:54 AM
On my way to @fosdem@fosstodon.org to give three talks today (see fosdem.org/2025/schedul...)
February 1, 2025 at 3:52 AM
I'm on the train to Malmö to give my first talk of the year, talking on Linux scheduler, eBPF and Java
January 20, 2025 at 7:12 AM
And I'm busy preparing the talk:
January 19, 2025 at 2:00 PM
I did a few conferences last year, I guess:
January 8, 2025 at 10:32 AM
The following is the only CPU arch specific code for JFR:
November 20, 2024 at 9:36 AM
TIL: The zero VM doesn't support JFR
November 19, 2024 at 11:37 AM
Many JFR events don't have any descriptions, so sapmachine.io/jfrevents/ now includes code snippets from the events usage in OpenJDK:
October 31, 2024 at 6:47 AM