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java1234

Former senior programmer at a Fortune Global 500 company, dedicated to sharing Java expertise. Visit Feng's site: Java Knowledge Sharing, www.java1234.com

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Latest from java1234

87 recent articles

java1234

Mar 13, 2026 · Backend Development

JEnv: A Next‑Gen Java Environment Manager that Simplifies Multi‑Version Management

JEnv tackles the long‑standing pain of juggling multiple Java versions by delivering sub‑second scanning (400 ms on a full‑depth scan), a concurrent Dispatcher‑Worker engine, smart pre‑filtering, cross‑platform support, themed terminals, real‑time statistics, and a modular architecture, all demonstrated with concrete benchmarks and usage scenarios.

CLIJEnvJava

0 likes · 9 min read

JEnv: A Next‑Gen Java Environment Manager that Simplifies Multi‑Version Management

java1234

Mar 12, 2026 · Databases

Understanding Redis Operation Atomicity: Concepts, Transactions, and Optimistic Locks

The article explains how Redis guarantees atomic operations through single‑command atomicity, MULTI/EXEC transactions, and the WATCH optimistic‑lock mechanism, providing Java/Jedis code examples and discussing their role in ensuring data consistency in distributed systems.

JavaJedisOptimistic Lock

0 likes · 6 min read

Understanding Redis Operation Atomicity: Concepts, Transactions, and Optimistic Locks

java1234

Mar 10, 2026 · Backend Development

What’s the Difference Between MyBatis First‑Level and Second‑Level Caches?

This article explains the concepts, characteristics, default states, and usage patterns of MyBatis first‑level (SqlSession) and second‑level (Mapper) caches, provides Java code demos for each, and compares their scope, lifecycle, consistency, and suitable scenarios.

CacheJavaMyBatis

0 likes · 7 min read

What’s the Difference Between MyBatis First‑Level and Second‑Level Caches?

java1234

Mar 8, 2026 · Backend Development

How to Build a Custom MyBatis Plugin: Step-by-Step Guide

This article explains the MyBatis plugin mechanism, walks through implementing the Interceptor interface, configuring the plugin in mybatis-config.xml, provides a complete code example, and outlines common use cases such as SQL logging, performance monitoring, permission control, and automatic field filling.

InterceptorJavaMyBatis

0 likes · 6 min read

How to Build a Custom MyBatis Plugin: Step-by-Step Guide

java1234

Mar 7, 2026 · Fundamentals

Merge or Rebase? The Ultimate Guide to Git Merge Strategies

This article compares Git's merge and rebase commands by walking through a realistic two‑developer scenario, illustrating fast‑forward versus non‑fast‑forward merges, conflict resolution differences, commit‑history rewrites, and practical recommendations on when to choose each approach.

Gitconflict resolutionmerge

0 likes · 6 min read

Merge or Rebase? The Ultimate Guide to Git Merge Strategies

java1234

Mar 3, 2026 · Backend Development

How MyBatis Plugins Execute: Core Interface and Runtime Flow

This article explains MyBatis’s plugin mechanism, detailing the Interceptor interface methods, how plugins form an interceptor chain to wrap core components like Executor, and provides a step‑by‑step example of a logging plugin with code and configuration, illustrating the runtime flow and extension capabilities.

InterceptorJavaMyBatis

0 likes · 7 min read

How MyBatis Plugins Execute: Core Interface and Runtime Flow

java1234

Mar 3, 2026 · Backend Development

One‑Line Java Time Tracker: Millisecond Precision and Up to 300% Faster Performance

The article shows how to replace repetitive System.currentTimeMillis() timing code with a concise TimeTracker utility that leverages try‑with‑resources, functional interfaces, and flexible exception handling to achieve millisecond‑level measurement and dramatically improve code readability and performance.

Exception HandlingFunctional InterfaceJava

0 likes · 13 min read

One‑Line Java Time Tracker: Millisecond Precision and Up to 300% Faster Performance

java1234

Mar 1, 2026 · Artificial Intelligence

Boost Your Coding Speed: Must‑Try AI Plugins for IntelliJ IDEA

This article reviews the most popular AI‑powered coding plugins for IntelliJ IDEA, detailing their features, ideal scenarios, installation steps, advantages, limitations, and practical effects, and provides a comparison table and recommended tool combinations for different development needs.

AI codingAmazon CodeWhispererCodeGeeX

0 likes · 7 min read

Boost Your Coding Speed: Must‑Try AI Plugins for IntelliJ IDEA

java1234

Mar 1, 2026 · Backend Development

Spring MVC Interceptor vs Filter: Key Differences and Execution Order

This article explains the fundamental differences between Spring MVC interceptors and servlet filters—including definition, scope, configuration, lifecycle, and execution timing—and details their processing order with illustrative code samples and a request flow diagram.

FilterInterceptorJava

0 likes · 8 min read

Spring MVC Interceptor vs Filter: Key Differences and Execution Order

java1234

Feb 28, 2026 · Artificial Intelligence

The Ironic New Role in the Large‑Model Era: The “Large‑Model Post‑Processing Engineer”

In the age of large‑model AI, code can be generated up to an 80‑point prototype with a single prompt, but turning that prototype into a reliable, secure, high‑performance product still requires engineers to perform the painstaking 20‑point post‑processing work.

AI code generationagent architecturelarge language models

0 likes · 9 min read

The Ironic New Role in the Large‑Model Era: The “Large‑Model Post‑Processing Engineer”