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Building agents on the JVM with Embabel · Part 7
My agent refused to run a single action. The @Condition gate was FALSE and nothing in the agent could ever make it TRUE, because Embabel builds an action's effects from what you declare, not from what your condition reads.
Building agents on the JVM with Embabel · Part 6
Turning my JVM agents into MCP tools took one dependency and one annotation. It also took three silent failures -- a starter that suppresses the web server, a shell that eats your CLI flags, and an annotation default that publishes exactly zero tools without telling you.
Building agents on the JVM with Embabel · Part 3
An LLM cannot know a live account balance, and in banking a confidently hallucinated number is a disaster. The fix is a tool. Here's how @LlmTool works in Embabel on the JVM, plus the one API gotcha that cost me a compile.
Building agents on the JVM with Embabel · Part 1
My first afternoon with Embabel, the JVM agent framework. I added one action too many, the planner quietly stopped early, and a cryptic get(...) must not be null taught me how GOAP, goals, and AgentInvocation actually fit together.
Learning MongoDB · Part 2
Part 2 of my MongoDB learning series: how the aggregation pipeline reshapes documents stage by stage — $unwind, $group, $lookup — plus the type-mismatch bug that silently joins nothing and why stage order is a cost decision.
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.