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Learning MongoDB · Part 1
Part one of a series: a Spring Boot 4 playground, the embed-vs-reference call that replaces schema normalization, and the Decimal128 default that would have quietly corrupted every price I stored.
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.
Shipping an AI feature into my own product · Part 1
Why my career site now answers questions out loud — the graceful-degradation bean, the SSE streaming, the atomic quota race, and the discoverability bug that had nothing to do with code.
A code-forward tour of Spring Batch 6 on Spring Boot 4 and Java 25 — the resourceless repository, the new ChunkOrientedStep engine, Spring Framework 7 retry, the CommandLineJobOperator, and how stop and recover actually work under the hood.
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.
Wiring Flyway into a Spring Boot 4.1 / Java 25 app with a Docker-Compose Postgres - including the Boot 4 auto-config modularization gotcha that makes a missing starter look exactly like a missing library.
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.