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Java Architect Handbook

Focused on Java interview questions and practical article sharing, covering algorithms, databases, Spring Boot, microservices, high concurrency, JVM, Docker containers, and ELK-related knowledge. Looking forward to progressing together with you.

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Latest from Java Architect Handbook

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Java Architect Handbook

Apr 6, 2026 · Databases

Why MySQL Indexes Still Slow Queries and How to Fix Them

This guide explains the six common reasons why MySQL indexes may fail to improve query speed, shows how interviewers evaluate index knowledge, and provides concrete SQL examples, EXPLAIN analysis, and practical optimization techniques such as redesigning indexes, using covering indexes, avoiding implicit type conversion, and tuning database configuration.

Covering IndexData SkewDatabase Interview

0 likes · 15 min read

Why MySQL Indexes Still Slow Queries and How to Fix Them

Java Architect Handbook

Apr 5, 2026 · Industry Insights

Unlocking Business Process Automation: How Workflow Engines Power Modern Enterprises

This article explains what a process engine is, its role in workflow and BPM, outlines typical application scenarios, and details the architectural components and design practices—including organization modeling, form and interface design, and implementation challenges—while highlighting emerging business opportunities such as low‑code platforms and process analytics.

ArchitectureProcess Orchestrationbpm

0 likes · 20 min read

Unlocking Business Process Automation: How Workflow Engines Power Modern Enterprises

Java Architect Handbook

Apr 4, 2026 · Backend Development

16 Powerful Redis Use Cases Every Backend Engineer Should Know

This article presents a comprehensive guide to 16 practical Redis applications—including caching, distributed sessions, locks, global IDs, counters, rate limiting, bitmaps, shopping carts, timelines, queues, lotteries, likes, product tagging, filtering, social graphs, and leaderboards—complete with command examples, code snippets, and visual illustrations to help developers implement these patterns efficiently.

BitmapCacheDistributed Lock

0 likes · 11 min read

16 Powerful Redis Use Cases Every Backend Engineer Should Know

Java Architect Handbook

Apr 3, 2026 · Databases

Master MySQL InnoDB Indexes: Avoid Costly Back‑Table Lookups in Interviews

This guide explains the principles behind InnoDB indexes, why secondary‑index queries may trigger back‑table lookups, and how covering indexes can eliminate the extra I/O, providing concrete SQL examples, EXPLAIN analysis, and best‑practice tips for interview preparation.

Back-tableCovering IndexDatabase Optimization

0 likes · 13 min read

Master MySQL InnoDB Indexes: Avoid Costly Back‑Table Lookups in Interviews

Java Architect Handbook

Apr 1, 2026 · Backend Development

Integrating Tess4j OCR into a Spring Boot 3 Project

This guide explains OCR fundamentals, introduces Tesseract and Tess4j, shows how to download the required language data files, and provides step‑by‑step instructions with Maven configuration, Spring Boot properties, Java code, and test examples for Chinese, English, and mixed‑language image recognition.

JavaOCRSpring Boot

0 likes · 11 min read

Integrating Tess4j OCR into a Spring Boot 3 Project

Java Architect Handbook

Mar 30, 2026 · Cloud Native

Understanding Docker Images, Containers, and Kubernetes Pods: A Beginner’s Guide

This article explains the core concepts of Docker images, containers, Dockerfile and docker‑compose, and how Kubernetes uses Pods to schedule and manage container workloads, providing a clear foundation for running applications consistently across any environment.

Cloud NativeContainersDevOps

0 likes · 8 min read

Understanding Docker Images, Containers, and Kubernetes Pods: A Beginner’s Guide

Java Architect Handbook

Mar 29, 2026 · Industry Insights

Which Java Backend Framework Reigns Supreme? A Data‑Driven Ranking

This article evaluates major Java backend frameworks using objective dimensions such as performance, ecosystem maturity, learning curve, development efficiency, enterprise adoption and innovation, categorizing them into five tiers and providing concrete data like startup time, memory usage and GitHub popularity to guide technology selection.

Framework ComparisonJavabackend

0 likes · 11 min read

Which Java Backend Framework Reigns Supreme? A Data‑Driven Ranking

Java Architect Handbook

Mar 27, 2026 · Frontend Development

Mastering CORS: In‑Depth Java Interview Guide for Cross‑Origin Solutions

This comprehensive guide explains the browser same‑origin policy, why cross‑origin restrictions exist, and walks through five major solutions—CORS, proxy servers, JSONP, postMessage, and WebSocket—detailing their principles, advantages, drawbacks, configuration examples, and best‑practice recommendations for interview scenarios.

CORSCross-OriginFrontend

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Mastering CORS: In‑Depth Java Interview Guide for Cross‑Origin Solutions

Java Architect Handbook

Mar 26, 2026 · Artificial Intelligence

30+ Real-World OpenClaw Use Cases: Automate Tasks with AI Agents

This article introduces the open-source "awesome-openclaw-usecases" repository, which curates over thirty practical AI agent workflows across six functional modules—social media, creative building, infrastructure & DevOps, productivity, research & learning, and finance—providing step‑by‑step guidance and example configurations for each use case.

AI AgentsAutomationGitHub

0 likes · 8 min read

30+ Real-World OpenClaw Use Cases: Automate Tasks with AI Agents

Java Architect Handbook

Mar 25, 2026 · Fundamentals

TCP vs UDP: Deep Dive for Java Interview Success

This guide breaks down the core differences between TCP and UDP—including connection handling, reliability, header overhead, transmission mode, and real‑world use cases—while providing interview focus points, concise answer tables, detailed analysis, common follow‑up questions, and handy mnemonics for Java developers.

Java InterviewProtocol comparisonTCP

0 likes · 14 min read

TCP vs UDP: Deep Dive for Java Interview Success