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The Main Thread

Markus Eisele, Alex Soto Bueno

The Main Thread publishes practical, opinionated articles about modern Java, Quarkus, and real-world system architecture.

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Substack
PricingOnly free issuesPublishesDaily
Issues416SubscribersRead the-main-thread.com

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Latest Issues

Recent posts by this newsletter. Browse the email archive.

API Versioning in Quarkus: The Part AI Doesn’t Solve

Versioning a REST API is one of those architectural chores that everyone knows they need to do, but nobody actually wants to implement. As your data models evolve, you have to maintain backward compatibility for existing clients while servi...

6 days ago
1
0

Why Smart Developers Get Bad Results from AI Tools

You’ve probably already tried it. A colleague demoed GitHub Copilot, or you read enough about Cursor to give it a weekend. You asked it something real, not a toy problem, something from your actual work, and what came back was plausible eno...

7 days ago
2
1

Java Can Call COBOL Now. That Doesn’t Solve Your Problem.

There are more COBOL transactions processed every day than there are Google searches. An estimated $3 trillion moves through COBOL systems daily. More new COBOL is written each year than Go. And as of right now, you can have a working COBOL...

8 days ago
1
0

Hibernate Statistics in Quarkus: Catch N+1 Before Production

Most performance problems in JPA applications are invisible until they’re catastrophic. You ship, traffic arrives, and suddenly your database is fielding ten queries where you expected one. Hibernate has had a built-in observability mechani...

9 days ago
3
0

Authors

The writers behind this newsletter.

  • Markus Eisele

    I’ve spent 20+ years helping Java systems adapt without breaking. Here I share the architecture, tools, and thinking behind that work. Java Champion · Developer · IBM Research.

  • Alex Soto Bueno

    IBMer, Java Champion, Teacher, Radio Collaborator in Onda Cero, and Writer of several books for O'Reilly and Manning

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