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Enterprise Java
Why Your Integration Tests Are Slower Than They Should Be: The Spring Context Cache You Don’t Know You’re Misusing
Every JCG article recommends @SpringBootTest for integration testing. Almost none explain the context cache model underneath it — how a single misplaced @DirtiesContext,…
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Core Java
The Split-Brain Problem in Plain English — And the Three Ways Your Distributed Cache Handles It Wrong
Redis Sentinel, Hazelcast, and Infinispan all have split-brain documentation. None of them tell you what your Java code silently observes…
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Core Java
ThreadLocal Is a Memory Leak Waiting to Happen With Virtual Threads — Here’s the Proof
ThreadLocal was designed for a world of 200 pooled platform threads living for the life of an application. Virtual threads…
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Software Development
Idempotency Keys Are Harder Than They Look: The 5 Failure Modes Nobody Talks About
Every payment guide, every microservices tutorial, and every distributed-systems primer tells you the same thing: make your endpoints idempotent. Add…
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Software Development
Vibe Coding Goes Wrong: What AI-Generated Code Actually Breaks in Production
AI coding tools promise to ship features faster than ever before. And in many ways, they deliver — until something…
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Core Java
The Hidden Cost of Records: When Java’s Immutable Data Classes Quietly Hurt Your GC
Records are clean, expressive, and widely adopted — but in tight, allocation-heavy loops, they can pile invisible pressure on the…
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TypeScript
TypeScript’s Type System as a Proof System: Type-Level Programming Beyond the Basics
Conditional types, infer, template literal parsing, recursive algorithms — and why the type checker is really a theorem prover you have…
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Core Java
How to Read a Flame Graph: A Practical Profiling Guide for JVM Developers
Stop guessing where your Java app is spending its time. Here is everything you need to go from zero to…
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Python
Python 3.13’s Free-Threaded Mode: What No-GIL Actually Means for Your Code
After nearly three decades, Python’s most notorious bottleneck is finally optional. Here is what really changes — and what does…
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