Software engineer building #DistributedSystems for fun and living 🤓 Tweets #Java #architecture #Kafka #craftsmanship & beyond 🚀 Mikes his own opinions & bytes
Poznań, Poland
Joined March 2014
- Tweets2.4K
- Following250
- Followers2.4K
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I've just published a small library that allows you to write #JUnit5 parameterized tests in a human-readable way. Just provide a format and use it to define your test cases 👇 github.com/mikemybytes/junit…
Mike Kowalski retweeted
JDK 27 reaches general availability on September 14. Two of its JEPs change your memory footprint and GC behavior with zero code change. A third headline feature is entering its twelfth incubation. Telling those two groups apart is the actual senior-dev read.
1/7
#Java + #Kubernetes quirk: if you remove CPU limits to avoid throttling, the #JVM may suddenly think it can use all CPUs on the node, which can mean dozens of extra threads (GC, JIT, ForkJoinPool...) 🤯
Luckily, there’s a way to address that 👇 mikemybytes.com/2026/03/12/k…
My 'Awesome lost & found' collection is back!
In this release: Java memory growth that isn’t a leak, how bytecode actually runs, and why growing organizations lose cost visibility 👇
github.com/mikemybytes/aweso…
Mike Kowalski retweeted
Put on your comfy shoes, because we're walking through some of the many notable performance improvements and features in JDK 25. 🚶 social.ora.cl/6011A7thd
Great engineers, just like great doctors, keep asking “why?” mikemybytes.com/2025/12/10/g…
Mike Kowalski retweeted
github.com/apple/containeriz…
This is interesting! Not only for containers, it also allows spawning lightweight virtual machines 👀
And it being OSS adds to the news 🔥
Mike Kowalski retweeted
We are working on a new big project for @GraalVM — Project Crema: github.com/oracle/graal/issu….
It will lift Native Image's default closed-world assumption by allowing dynamic loading and execution of classes at run time.
Stay tuned for updates!
Mike Kowalski retweeted
Apache Kafka @apachekafka 4.0 says goodbye to ZooKeeper! Take a look at what other important changes it brings.
softwaremill.com/apache-kafk…
Excellent ZGC deep dive 🤿
How ZGC efficiently allocates memory and balances physical memory mapping to minimize overall runtime memory usage. While assessing memory usage, you may want to look at how good the GC is at reclaiming unused memory to the OS.
joelsiks.com/posts/zgc-heap-…
#Java #GC #ZGC #OpenJDK
Testcontainers is one of a few technologies that have truly revolutionised the way I work. Thank you and happy birthday!
Happy 10th birthday (counted from the first public commit on GitHub) to @testcontainers 🥳🍰
Thank you for changing our lives in many, sometimes unexpected ways ☺️
📢 New post: #Java 24 - Thread pinning revisited
I don't remember being so excited about some of my past articles becoming obsolete! mikemybytes.com/2025/04/09/j…
Prescription without diagnosis is malpractice. It applies to medicine, coaching, and software architecture 🧑⚕️
Mike Kowalski retweeted
Java thread pinning detection using JFR Event Streaming with Spring Boot
github.com/mikemybytes/jfr-t…
@mikemybytes
"Immutability makes code more reasonable" 💯
Blogged: Restrict Mutability of State
"Much code that we consider complex is considered complex because of the mental highwire act we perform when trying to understand what (the hell) is going on. Thinking about code should not be a circus performance."
kevlinhenney.medium.com/rest…
Making a bigger impact without working more? Last year, I discovered that it's not only possible but also effective. It was a year of scaling myself. mikemybytes.com/2025/02/05/a…
Mike Kowalski retweeted
We're coming towards the end of #AWSreinvent 2024 and we've seen an impressive set of releases, so here is my top 10 announcements I find most impactful for this years #AWS re:Invent.
I can’t remember the last time I was so excited about one of my articles becoming obsolete! mikemybytes.com/2024/02/28/c…
Virtual threads in OpenJDK trunk are no longer pinned to a platform/physical/carrier thread when in Synchronized block 🎉
github.com/openjdk/jdk/pull/…
Mike Kowalski retweeted
🥳 JEP proposed to target JDK 24: 450: Compact Object Headers (Experimental) 🎉
mail.openjdk.org/pipermail/j…
Mike Kowalski retweeted
My open source library - @springboot & @wiremock integration has been adopted by WireMock and is now THE official integration for these two projects:
github.com/wiremock/wiremock…
Mike Kowalski retweeted
#Java Time Tip: Watch out for equals() vs isEqual() in date-time classes! ZonedDateTime, OffsetDateTime, and OffsetTime behave different:
equals(): Compares all fields (including zone/offset) isEqual(): Compares instants (ignoring zone/offset)
Same moment, different result
