Analytics in the Browser with DuckDB-Wasm and a Java Backend
A Java backend sends the dataset once and DuckDB-Wasm runs the SQL in the browser. A two-file example with no build tools, and when the approach makes sense.
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Jakarta EE Testing Tools Compared: WeldInitiator, Arquillian and Testcontainers
WeldInitiator, Arquillian, and Testcontainers answer three different questions about a Jakarta EE application. Here is what each one proves, and where each one stops.
Skills across coding assistants
Claude Code reads skills from its own folders, while other assistants also scan .agents/skills. Where each one looks, and how symlinks fix it.
Foojay Podcast #105: Security Is Your Job: OWASP, AI and Safer Java Dependencies with Jim Manico
OWASP's Jim Manico on modernizing the Java Encoder and HTML Sanitizer with AI, trimming dependencies, and why every Java team needs a security process.
Giving AI Agents Live Observability into a JVM Runtime with MCP
BxMCP exposes live JVM, cache, datasource, request, scheduler, logging, and runtime diagnostics to AI agents through MCP, with 150+ tools and production security controls.
Spring Config Import Demystified
How Spring Boot processes spring.config.import: loading passes, property precedence, resolvers, loaders, and integration with Vault and Config Server.
5 JVM Heap OOM Patterns You Can Reproduce on Your Laptop
Five real out-of-memory scenarios across G1, ZGC, and Shenandoah — each with a reproducer script, diagnosis walkthrough, and fix.
Comparing Java Formatters: Why Open Java Format Is My New Favorite
Comparing Google Java Format 2.0, Palantir Java Format, Open Java Format, Prince of Space, and Netflix jfmt on JDK 25 across 86 scenarios.
Who Is Actually Turning Your Java Object Into JSON?
A hands-on comparison of JSON-P, JSON-B and Jackson with Helidon SE 27.
I Trained a Neural Net to Play Pokémon
A neural net that plays the Pokémon TCG, 4.2 million games, and the Java batch jobs that kept the training league running overnight.
An Introduction to JSR 381, the Java Visual Recognition API
JSR 381 is Java's standard API for image classification. Use its Deep Netts reference implementation, then write a DuckDB-backed classifier in five files.
Spring Boot JPA vs JDBC: How Much Can a Small App Save?
A small Spring Boot app used about 90 MiB less RSS with JDBC than with JPA and Hibernate, and reached its dashboard sooner.
Your Agent's Tool Calls Will Run Twice: Idempotency and Evaluation Gates in Java Services
Why every LLM tool call eventually runs twice, and how idempotency keys plus evaluation gates make that safe in Java services.
Idempotent Spring Boot: From 0.1 to 1.1 — Lessons in Reliability, Performance, and Open Source
How an idempotent Spring Boot starter evolved from 0.1 to 1.1: exactly-once JDBC, production fixes, a stability promise, and a first outside contribution.
Building a full-stack web app using only Java, in 5 small classes
Build a full-stack web app using only Java: one Maven command, a table backed by Spring Data and a validated form in 5 classes, no JavaScript.
Paging DTO Projections in Spring Data JPA: Three Approaches Compared
Constructor expressions, interface projections and generated read models: what each costs when a list screen needs paging and optional filters.
