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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 14, 2026 · Backend Development

Why RocketMQ Beats Kafka and RabbitMQ in Java Interviews: 6 Core Advantages

This article breaks down the interview focus points for messaging middleware, explains RocketMQ's "Three High and One Rich" advantages—high throughput, reliability, consistency, and rich features—compares it with Kafka and RabbitMQ, presents six detailed reasons with code samples, a selection decision tree, common interview variants, memory mnemonics, and a concise conclusion for Java developers.

Delayed MessageJava interviewMessage Queue

0 likes · 15 min read

Why RocketMQ Beats Kafka and RabbitMQ in Java Interviews: 6 Core Advantages

Java Architect Handbook

Apr 10, 2026 · Backend Development

Master Redis Distributed Locks: From SETNX Basics to Redisson and RedLock

This guide explains why distributed locks are needed, compares three implementation stages—from basic SETNX+EXPIRE to atomic SET NX EX with Lua scripts, and finally Redisson and RedLock—provides code samples, interview questions, and practical tips for Java developers.

InterviewJavaRedis

0 likes · 13 min read

Master Redis Distributed Locks: From SETNX Basics to Redisson and RedLock

Java Architect Handbook

Apr 9, 2026 · Databases

Master MySQL DDL: Online DDL Algorithms, Version Differences, and Production Indexing Tips

This guide explains MySQL DDL mechanisms, compares COPY, INPLACE, and INSTANT algorithms across versions, details Online DDL execution phases and risks, and provides practical production‑grade indexing practices and interview Q&A for handling large tables without blocking reads or writes.

DDLINPLACEInstant DDL

0 likes · 11 min read

Master MySQL DDL: Online DDL Algorithms, Version Differences, and Production Indexing Tips

Java Architect Handbook

Apr 7, 2026 · Databases

Master MySQL’s Redo, Undo, and Binlog: Deep Dive for Interview Success

This article provides a comprehensive interview guide on MySQL’s three core logs—redo log, undo log, and binlog—covering their architecture, roles in crash recovery, MVCC, replication, configuration commands, two‑phase commit workflow, and frequent follow‑up questions to help candidates ace database interview questions.

Database Interviewbinloglog architecture

0 likes · 13 min read

Master MySQL’s Redo, Undo, and Binlog: Deep Dive for Interview Success

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.

Data SkewDatabase InterviewEXPLAIN

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.

BPMLow‑codeProcess Engine

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.

CacheRate LimitingRedis

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-tableDatabase OptimizationInnoDB

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