← Back to blog

JVM

2 posts

Relearning Java Concurrency Control from the Ground Up
Sep 23, 2025
This article explores how the JVM monitor behind synchronized actually works, examines the concurrency-control features provided by ReentrantLock, and solves the producer-consumer problem that can arise in concurrent programs. It then improves performance with a lock-striping strategy based on per-user keys.
How an External API Nearly Brought Down Our Service: Adopting Virtual Threads
Sep 20, 2025
This article traces how I diagnosed thread blocking caused by network I/O and found a fundamental solution with JDK 21 virtual threads. Beyond the initial fix, it examines the unexpected challenges of thread pinning and overwhelming that emerged during adoption, along with their solutions.