Software engineer building #DistributedSystems for fun and living 🤓 Tweets #Java #architecture #Kafka #craftsmanship & beyond 🚀 Mikes his own opinions & bytes
Joined March 2014
- Tweets 2,449
- Following 250
- Followers 2,406
- Likes 5,672
173 Photos and videos
Pinned Tweet
8 Aug 2022
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…
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Mike Kowalski retweeted
Jun 1
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.
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Mar 12
#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…
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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…
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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
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10 Dec 2025
Great engineers, just like great doctors, keep asking “why?” mikemybytes.com/2025/12/10/g…
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Mike Kowalski retweeted
9 Jun 2025
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 🔥
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Mike Kowalski retweeted
4 Jun 2025
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!
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Mike Kowalski retweeted
28 Apr 2025
Apache Kafka @apachekafka 4.0 says goodbye to ZooKeeper! Take a look at what other important changes it brings.
softwaremill.com/apache-kafk…
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26 Apr 2025
Excellent ZGC deep dive 🤿
22 Apr 2025
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
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13 Apr 2025
Testcontainers is one of a few technologies that have truly revolutionised the way I work. Thank you and happy birthday!
12 Apr 2025
Happy 10th birthday (counted from the first public commit on GitHub) to @testcontainers 🥳🍰
Thank you for changing our lives in many, sometimes unexpected ways ☺️
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9 Apr 2025
📢 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…
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27 Feb 2025
Prescription without diagnosis is malpractice. It applies to medicine, coaching, and software architecture 🧑⚕️
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Mike Kowalski retweeted
26 Feb 2025
Java thread pinning detection using JFR Event Streaming with Spring Boot
github.com/mikemybytes/jfr-t…
@mikemybytes
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10 Feb 2025
"Immutability makes code more reasonable" 💯
8 Feb 2025
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…
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5 Feb 2025
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…
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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.
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12 Nov 2024
I can’t remember the last time I was so excited about one of my articles becoming obsolete! mikemybytes.com/2024/02/28/c…
12 Nov 2024
Virtual threads in OpenJDK trunk are no longer pinned to a platform/physical/carrier thread when in Synchronized block 🎉
github.com/openjdk/jdk/pull/…
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Mike Kowalski retweeted
31 Oct 2024
🥳 JEP proposed to target JDK 24: 450: Compact Object Headers (Experimental) 🎉
mail.openjdk.org/pipermail/j…
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Mike Kowalski retweeted
16 Oct 2024
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…
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Mike Kowalski retweeted
14 Oct 2024
#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
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