CodeTutorials

Why Use char[] Instead of String for Passwords in Java

In modern software development, secure password handling extends far beyond hashing and salting in the database. A critical yet frequently…

Interviewer: Tell me about async/await?

A while ago, during a technical interview for a senior backend position, my mind went blank for a second. I almost blurted out the classic…

Building a JVM Health Check Task for Production Systems

This article reflects on a major issue that occurred in 2026 year.

In-depth Analysis of the Entire Spring MVC Parent–Child Container Build Process

Introduction

Practical Guide to Kafka Message Backlog Handling: Optimization Techniques for Emptying…

Having worked as a Java developer for eight years, I have encountered at least eighty to a hundred middleware-related pitfalls. Among them…

Understanding the Construction of the IoC Container in a Web Environment by Starting with a Single…

Foreword

10x Increase in Throughput: Architectural Evolution and Performance Optimization for…

Architecting high-concurrency batch processing systems with Spring Boot, XXL-JOB, Redis, and MySQL.

LangChain4j: The Ultimate Java Developer’s Guide to Building Enterprise AI Applications with RAG…

Why Every Java Developer Should Learn LangChain4j in 2026

🚀 Beyond Database Sharding and Table Partitioning: My Interview Experience with Database Sharding…

The Question That Silenced the Room

How to Shard and Partition Databases for 1 Billion Orders

As e-commerce platforms scale rapidly, database performance becomes a critical bottleneck. When a single MySQL orders table approaches or…

Differences between SELECT COUNT(*), SELECT COUNT(1), and SELECT COUNT(column) in MySQL — An…

A Comprehensive Analysis of Spring Boot 4 and Spring Framework 7: New Features, Upgrade…

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Java Interview Questions from a Top Company: EY (Based on My Personal Experience)

Preparing for Java interviews at leading consulting and technology-driven organizations like EY (Ernst & Young) requires much more than…

Optimizing API Performance Under High Concurrency: A Practical Journey with Spring Cache and…

Imagine a production environment where CPU usage is consistently spiking near 100%. Upon investigation, you discover a perfect storm…

Redis Persistence Explained: The Complete Production Guide Every Backend Engineer Should Know

Redis is one of the fastest in-memory databases available today, powering everything from caching layers and session stores to real-time…

The Missing Link: Why @Autowired Fails in Java’s InvocationHandler

Understanding the boundary between Spring’s magic and Java’s core reflection.