Yesterday I left a detail hanging: it's not that "something" blocks the carrier thread. There are exactly two scenarios, documented in JEP 444, and if you migrate legacy code without knowing them, pinning is going to explain why your virtual thread pool isn't scaling the way you expected.
Aug 28 2026 · 7′ · Tutorials · concurrencia · java
Virtual Threads solves the cost of spinning up thousands of threads in the JVM. It doesn't solve the blocking problem when your code has synchronized blocks or blocking native calls. JEP 444 says so, but almost nobody reads it to the end.
Aug 11 2026 · 8′ · Tutorials · concurrencia · spring-boot
I built a reproducible lab with Spring Boot 3.5, Java 21, AppCDS, AOT, and GraalVM Native. The conclusion isn't that native wins or that classic JVM loses: it's that in 2026, comparing only startup time is the fastest way to make an architecture decision with incomplete data.
May 17 2026 · 5′ · Experiments · Performance · arquitectura
Locking down Actuator endpoints isn't enough. After the incident, I rebuilt the authorization model from scratch: explicit SecurityFilterChain, separate health groups, roles for /metrics and /env, and real validation with curl. This is what's still standing.
May 12 2026 · 7′ · Experiments · devops · backend
After publishing my Jakarta EE vs Spring Boot analysis, I audited Actuator's defaults on a backend I own and found sensitive endpoints wide open — ones I never consciously configured. Here's the hardening checklist I built afterward.
May 11 2026 · 7′ · Experiments · devops · backend
Architecture, real systems, product decisions and technical lessons. Everything reviewed with my own judgment before it ships.
222 articles published