The Main Thread
Markus Eisele, Alex Soto BuenoDeep dives into Quarkus, AI tooling, and the architecture decisions that actually matter for senior Java engineers.
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the-main-thread.comLatest Issues
AI Coding Still Needs Specs, Contracts, and Verification
After The Spec Trap, one pushback came back fast. A coworker said something a lot of people say right now: natural language is ambiguous, code is precise, therefore code is the only spec that matters.
This is a smart but wrong objection....
Build a Local AI Jury in Quarkus with Ollama
Single-model AI demos often treat the first confident answer as if it were a decision. A local model can be fast, cheap, and still wrong in a very polished way. When the text is sarcastic, mixed, or culturally loaded, “the model answered” d...
Quarkus Repository Guardrails for Agent-Generated Java Code
Better models help, but they still ship familiar mistakes.
Agentic coding tools are good at producing a diff that compiles, passes the happy path, and looks finished in review. They are less reliable with the dull rules that keep Java code...
IBM Bob Cost Control Starts With Context Hygiene
Use .bobignore, narrower MCP toolsets, smaller @ mentions, and fresh chats to keep Bob useful and Bobcoins boring.
Open Bob and watch the token counter in the top-right corner before you ask it to do anything clever. That little number...
Using JaCoCo and AI to Prioritize Test Coverage in Quarkus Teams
In the latest video, my co-author Alex Soto shows a test coverage workflow I actually like. I do not care about 100% coverage as a badge. I care about whether the important parts of the system are tested. Past that point, the number gets ex...
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Authors
The writers behind this newsletter.
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.
IBMer, Java Champion, Teacher, Radio Collaborator in Onda Cero, and Writer of several books for O'Reilly and Manning
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