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Markus Eisele
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Markus Eisele✓

@myfear

Something at @IBMResearch. Legal thinks you need to know that I'm speaking for myself here. I believe you knew.

1.7K Following29.8K Followers67.7K Posts
  2. Markus Eisele✓@myfear
    It’s been a pressure! 🙏
    Dr. Kate Holterhoff @KateHolterhoff
    Look who got to chat w @myfear at @IBM #TechXchange!! Naturally, we caught up on all the Bob news that dropped
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  4. Markus Eisele✓@myfear
    I looked back at seven years of Quarkus and how much we can now use through community extensions. Which extension has saved you the most integration code? #Quarkus #Java
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  6. Markus Eisele✓@myfear
    An agent asked to find a ticket may also have tools to change priorities or send replies. I explore how to define its job, separate drafts from delivery, and enforce the authority you actually intended to give it.
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  8. Markus Eisele✓@myfear
    How do you describe the UI you want a coding model to build? I explore a test-results viewer in four directions: Swiss report, editorial, developer workbench, and neo-brutalist. The examples include working filters and failure details, with prompts that specify layout, typography, and spacing. The screenshots come from one shared implementation session.
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  9. Markus Eisele✓@myfear
    I gave a deliberately broken Java pricing calculator 50 tests. Every one passed. So, what do your AI-generated tests actually prove? Three examples of checking the requirements, assertions, and inputs before trusting a green build.
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  10. Markus Eisele✓@myfear
    Markus Eisele
    RT @doodlestein: Everyone who owns hardware with abominable software (like Sonos players) owes a debt of gratitude to Venkatraman Srinivasan and the rest of the eMudhra gang in Bengaluru, Karnataka. Without their gross negligence, it'd be a lot harder to counterfeit certificates and fix the sw🙏
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  11. Markus Eisele✓@myfear
    If I can make a wish: throw less token at vulnerabilities and more at biology and medicine!
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  12. Markus Eisele✓@myfear
    I built a two-step Qute/HTMX form and followed validation, editing, and submission using the keyboard. A 422 response brings back the entered values and focuses the error summary. If I Tab away during a slow request, focus stays where I put it. The Java 25/Quarkus example includes Playwright tests, axe scans, and a manual screen-reader procedure.
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  13. Markus Eisele✓@myfear
    Markus Eisele
    RT @MaritvanDijk77: Reminder that the plural of regex is regrets...
    Gunnar Morling 🌍 @gunnarmorling
    Good reminder to avoid compiling regular expressions from unrestricted user input whenever you can. Even setting RCE aside, ReDoS is a real risk with backtracking engines. If you must, quote the input, use a linear-time engine like RE2, or bound match time.
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  14. Gunnar Morling 🌍✓@gunnarmorling
    Good reminder to avoid compiling regular expressions from unrestricted user input whenever you can. Even setting RCE aside, ReDoS is a real risk with backtracking engines. If you must, quote the input, use a linear-time engine like RE2, or bound match time.
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  15. Markus Eisele✓@myfear
    👇🏻 this! 💯
    Matt Pocock @mattpocockuk
    The code, not the spec, should be the center of your universe
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  16. Matt Pocock✓@mattpocockuk
    The code, not the spec, should be the center of your universe
    148531.3K115K
  17. Markus Eisele✓@myfear
    Sports update: in the Champions League of incident response, the SOC has lost 7:0 against a teenager with a Raspberry Pi. The manager blames the referee, the cloud, and "the sophistication of nation-state actors." It was a default password.
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  18. Markus Eisele✓@myfear
    An agent tool called search(query) still leaves the model guessing which data it searches and what syntax it accepts. I'd start with a specific name and a description of the actual search rules. Then define what an empty result and a failed call mean. Java, Quarkus, and LangChain4j examples: #Java #AIAgents
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  19. Markus Eisele✓@myfear
    The eMudhra CA Compromise: Why Your JVM Is Vulnerable (and How to Fix It Properly) @glaforge
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  20. Markus Eisele✓@myfear
    🤣👇🏻
    Grzegorz Piwowarek @pivovarit
    spec-driven development in practice
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  22. Markus Eisele✓@myfear
    My Java inventory example had one item and two callers. TLC found the overselling sequence in a TLA+ model; Lean checked a separate arithmetic rule. The Java tests stayed in the build. In this Main Thread Podcast episode, I revisit spec drift and the limits of those checks. Listen: #Podcasts
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  23. Markus Eisele✓@myfear
    MCP servers: because what your attack surface really needed was a plugin ecosystem written over a long weekend by strangers. Zero audits, infinite trust.
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  24. Markus Eisele✓@myfear
    Why searching for “Nesbo” returns nothing when Jo Nesbø is right there in the index. A classic Hibernate Search analyzer mismatch, and the small asciifolding change that fixes it. Hands-on diagnosis + the regression test that keeps it fixed. #Java #HibernateSearch #Quarkus
    Download
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  25. Markus Eisele✓@myfear
    Markus Eisele
    RT @myfear: I added a transactional outbox to a Quarkus checkout: order and event commit together in PostgreSQL, then a scheduler publishes to Kafka. The walkthrough covers JVM crashes after commit and after Kafka acknowledgement, plus an idempotent fulfillment insert. I also explain where Debezium's embedded Quarkus engine fits.
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