Database Indexing Mistakes That Senior Java Developers Still Make in 2026: A Deep Dive With PostgreSQL and Hibernate

You’ve shipped dozens of services. You know what a B-tree is. Yet your PostgreSQL queries are still crawling at 3…

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How to Read a Flame Graph: A Practical Profiling Guide for JVM Developers

async-profiler demystified — learn to spot the hot frames, understand the stack, and fix what actually matters. Why Flame Graphs…

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Reading JVM Safepoint Logs Without Going Mad: A Practical Stop-the-World Diagnosis Guide

JFR and async-profiler guides are everywhere. Safepoint logs — the raw output that tells you exactly why your JVM froze — are…

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String Deduplication Is On By Default in G1 — And Most Developers Don’t Know What It Does

A granular look at what the JVM is quietly doing with your strings at the native level, when that work…

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The Database Migration Risk That Hibernate Silently Creates

Why hbm2ddl.auto=update is still in production codebases — and what to do about it Somewhere in a production codebase right now, Hibernate…

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Understanding OAuth 2.0 Token Exchange

In modern software architectures, especially microservices-based systems, authentication is no longer a simple “login once, use everywhere” problem. A single…

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A Complete Guide to MFA in Spring Security 7

Multi-Factor Authentication (MFA) is a security mechanism that requires users to verify their identity using multiple authentication methods before gaining…

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Dependency Confusion Attacks in Maven: How They Work and Why Your settings.xml Makes You Vulnerable

In 2021, a security researcher breached Apple, Microsoft, PayPal, and 32 other organisations without writing a single exploit. He just…

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Mutation Testing With PIT in Java: The Coverage Metric You’re Ignoring That Actually Measures Test Quality

Line coverage tells you which code ran. Mutation testing tells you whether your tests would actually catch a bug. Here…

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