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Building agents on the JVM with Embabel · Part 9
Ask the same question twice in one session and the planner drops a step. Not a cache — a consequence of A* refusing to schedule an action whose output is already on the blackboard, for better and for worse.
I got annoyed at 'free' CV builders that paywall the download button, so I built one that is actually free: a guided wizard with a live A4 preview, French and English, and a PDF that never touches my server. Here is the product thinking, the architecture, and the near-outage a code review caught.
Spring Data JDBC takes DDD aggregates literally. Here's a one-question rule for drawing aggregate boundaries — and how to avoid N+1 once you have them, verified against the real generated SQL.
The Model Context Protocol, hands on
How I turned Apache Kafka into a set of tools an AI client can call — using Spring AI's MCP server, a handful of @Tool methods, and one ugly-but-necessary servlet filter.
Traces, Tempo and the LGTM stack
Wiring OpenTelemetry into Spring Boot 4 — the annotation way and the manual Tracer way — plus the context model that ties them together and the gotchas that cost me time (a silent @WithSpan, http/protobuf vs gRPC, and Docker's 'is a directory').
Three validation mechanisms wear one annotation vocabulary in Spring MVC. Only one hands you a ConstraintViolationException — the rest give you Spring's own web exceptions. Here's the map, with live proof.
How I added a public, server-rendered blog to a login-gated CV site without a second app or container — one jar, two hostnames, and a host-dispatch filter.