Java Sock Merchant Problem: Solutions with Arrays and HashSets

The Sock Merchant problem is an algorithm challenge that tests our ability to work with arrays, counting, and basic data…

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Convert ByteBuffer to Byte Array in Java

Java applications often work with binary data while performing file operations, network communication, serialization, and NIO (New I/O) programming. Two…

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Event Sourcing Without a Framework: What You Actually Need, What You Don’t, and the Parts Nobody Warns You About

Most Java tutorials reach for Axon before explaining the moving parts underneath it. This is the framework-agnostic treatment — the…

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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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