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Java Backend Technology

Focus on Java-related technologies: SSM, Spring ecosystem, microservices, MySQL, MyCat, clustering, distributed systems, middleware, Linux, networking, multithreading. Occasionally cover DevOps tools like Jenkins, Nexus, Docker, and ELK. Also share technical insights from time to time, committed to Java full-stack development!

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Latest from Java Backend Technology

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Java Backend Technology

Sep 10, 2025 · Databases

8 Proven MySQL Tricks to Supercharge Query Performance

This article walks through eight practical MySQL optimization techniques—including smarter LIMIT usage, avoiding implicit type conversion, rewriting UPDATE/DELETE with JOINs, handling mixed sorting, replacing EXISTS with joins, pushing predicates, narrowing result sets early, and leveraging WITH clauses—to dramatically reduce query execution time from seconds to milliseconds.

MySQLPerformance TuningQuery Planning

0 likes · 13 min read

8 Proven MySQL Tricks to Supercharge Query Performance

Java Backend Technology

Sep 8, 2025 · Backend Development

How to Track Online Users with Redis ZSET: A Step‑by‑Step Guide

This article explains how to implement an online‑user counting feature using Redis sorted sets (zset) by leveraging the four core commands zadd, zrangeByScore, zremrangeByScore, and zrem, with Java/Spring code examples and optional browser‑fingerprinting for unauthenticated visitors.

JavaOnline UsersRedis

0 likes · 7 min read

How to Track Online Users with Redis ZSET: A Step‑by‑Step Guide

Java Backend Technology

Sep 4, 2025 · Backend Development

How to Refresh Spring Boot Config at Runtime Without Restart

This guide explains why traditional Java apps require restarts for config changes, introduces Spring Boot's @RefreshScope for hot configuration updates, details its core principles, provides step‑by‑step implementation, best practices, troubleshooting tips, and advanced use cases such as dynamic feature toggles and logging level adjustments.

0 likes · 10 min read

How to Refresh Spring Boot Config at Runtime Without Restart

Java Backend Technology

Sep 3, 2025 · Backend Development

Why the Username “null” Can Crash Your App and How to Prevent It

Using the literal string "null" as a username can cause validation failures, database pollution, security risks, and endless debugging, but with proper checks, front‑end validation, database constraints, and clear logging you can avoid these hidden bugs.

backendnull stringsecurity

0 likes · 5 min read

Why the Username “null” Can Crash Your App and How to Prevent It

Java Backend Technology

Sep 1, 2025 · Backend Development

Mastering Java 8 Functional Interfaces: Cleaner Code with Function, Supplier, Consumer & Runnable

This article explains Java 8's functional interfaces—including Function, Supplier, Consumer, and Runnable—showing how to replace verbose if‑else and exception handling with concise lambda expressions, and provides reusable utility interfaces for branching, present‑or‑else logic, and exception throwing.

Functional InterfaceJava8Lambda

0 likes · 6 min read

Mastering Java 8 Functional Interfaces: Cleaner Code with Function, Supplier, Consumer & Runnable

Java Backend Technology

Aug 29, 2025 · Backend Development

Why Feat Outperforms Spring Boot and Vert.x: A High‑Performance Java Web Framework

Feat is a high‑performance Java web service framework that offers a SpringBoot‑like development experience while delivering faster startup, lower memory usage, higher request throughput, and built‑in AI‑native and cloud‑native capabilities, making it a compelling alternative for modern backend development.

AIJavaPerformance

0 likes · 7 min read

Why Feat Outperforms Spring Boot and Vert.x: A High‑Performance Java Web Framework

Java Backend Technology

Aug 27, 2025 · Backend Development

Using Weighted Round Robin to Satisfy Per‑Platform Rate Limits in Java

This article explains how to handle downstream API rate limits that differ per platform by interleaving requests with a weighted round‑robin algorithm, shows the pitfalls of simple sleep‑based throttling, and provides complete Java code for a practical implementation.

Javaalgorithmrate limiting

0 likes · 11 min read

Using Weighted Round Robin to Satisfy Per‑Platform Rate Limits in Java

Java Backend Technology

Aug 26, 2025 · Backend Development

Why Java Uses Reverse Domain Names for Packages and How It Improves Code Organization

This article explains Java's reverse domain naming convention, shows a typical Maven project layout, and outlines how using reversed domain prefixes in package names prevents naming conflicts, ensures global uniqueness, enhances readability, and supports logical layering of code modules.

Domain ReverseJavaPackage Naming

0 likes · 5 min read

Why Java Uses Reverse Domain Names for Packages and How It Improves Code Organization

Java Backend Technology

Aug 25, 2025 · R&D Management

Should You Join an IT Outsourcing Team? Pros, Cons, and How to Choose

This article explains what IT outsourcing is, compares two‑party and three‑party contracts, outlines the advantages and disadvantages for developers, and offers practical advice on selecting the right outsourcing role based on career goals, salary expectations, and learning opportunities.

IT careercareer advicecontract types

0 likes · 18 min read

Should You Join an IT Outsourcing Team? Pros, Cons, and How to Choose

Java Backend Technology

Aug 22, 2025 · Backend Development

How Jeandle’s LLVM‑Powered JIT Could Revolutionize Java Performance

Jeandle, the new open‑source LLVM‑based JIT compiler released by Ant Group, aims to boost Java performance by integrating LLVM’s optimization capabilities into the JVM, explaining JIT and LLVM fundamentals, its architecture, and an ambitious roadmap toward full bytecode support and advanced optimizations.

JITJVMJava

0 likes · 6 min read

How Jeandle’s LLVM‑Powered JIT Could Revolutionize Java Performance