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Java Captain

Focused on Java technologies: SSM, the Spring ecosystem, microservices, MySQL, MyCat, clustering, distributed systems, middleware, Linux, networking, multithreading; occasionally covers DevOps tools like Jenkins, Nexus, Docker, ELK; shares practical tech insights and is dedicated to full‑stack Java development.

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Latest from Java Captain

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Java Captain

Jun 3, 2025 · Information Security

Integrating Spring Security with Spring Boot for JWT Authentication and Authorization

This article demonstrates how to integrate Spring Security into a Spring Boot application, configure JWT‑based authentication, implement custom AES encryption, define user and role entities, set up service and controller layers, and configure security, filter, and CORS settings to achieve secure login and permission management.

AuthenticationAuthorizationJWT

0 likes · 19 min read

Integrating Spring Security with Spring Boot for JWT Authentication and Authorization

Java Captain

Jun 3, 2025 · Backend Development

Implementation of Order Service with Distributed Transactions, Locks, and Asynchronous Processing in Java

This article explains how to build a robust order service using Seata distributed transactions, Redisson distributed locks, CompletableFuture for asynchronous operations, token-based duplicate‑submission prevention, and RabbitMQ delayed queues for automatic order cancellation, with full Java code examples.

Seatadistributed lockdistributed transaction

0 likes · 21 min read

Implementation of Order Service with Distributed Transactions, Locks, and Asynchronous Processing in Java

Java Captain

May 29, 2025 · Cloud Native

Advanced Nacos: Service Cluster Setup, Configuration Loading Order, and Common Issues

This guide explains how to build a Nacos service cluster, configure providers and consumers, write the necessary Spring Cloud Nacos YAML and Java controller code, detail the steps for setting up multiple Nacos nodes, and troubleshoot typical startup errors.

ClusterJavaNacos

0 likes · 7 min read

Advanced Nacos: Service Cluster Setup, Configuration Loading Order, and Common Issues

Java Captain

May 28, 2025 · Fundamentals

Introduction to ZooKeeper: Design Goals, Data Model, Sessions, Watches, Consistency Guarantees, Leader Election, and Deployment

This article provides a comprehensive overview of ZooKeeper, covering its purpose as a distributed coordination service, design objectives such as consistency and reliability, hierarchical data model, session and watch mechanisms, consistency guarantees, leader election and Zab protocol, as well as practical deployment details.

ConsensusDistributed CoordinationLeader Election

0 likes · 20 min read

Introduction to ZooKeeper: Design Goals, Data Model, Sessions, Watches, Consistency Guarantees, Leader Election, and Deployment

Java Captain

May 28, 2025 · Information Security

WeChat Account Unblocking Guide: Self-Service and Manual Appeal Procedures (2025 Update)

This comprehensive guide explains the 2025 WeChat account unblocking process, covering identification of restriction types, required evidence, self‑service five‑step recovery, advanced manual appeal tactics, common issues, and post‑unblock security measures to help users restore access efficiently.

WeChataccount recoverymanual appeal

0 likes · 10 min read

WeChat Account Unblocking Guide: Self-Service and Manual Appeal Procedures (2025 Update)

Java Captain

May 27, 2025 · Backend Development

Resolving Thymeleaf Template Not Found Errors in Spring Boot 3.4.3 When Running as a JAR

After encountering Thymeleaf template parsing failures when packaging a Spring Boot 3.4.3 application as a JAR, the author resolves the issue by configuring the template resolver in Java code, disabling Thymeleaf settings in application.yml, and adjusting ModelAndView paths to omit leading slashes.

ModelAndViewThymeleafbackend-development

0 likes · 3 min read

Resolving Thymeleaf Template Not Found Errors in Spring Boot 3.4.3 When Running as a JAR

Java Captain

May 25, 2025 · Databases

Database Transactions: ACID Properties, Isolation Levels, and Usage in MySQL

This article provides a comprehensive overview of database transactions, explaining ACID properties, transaction states, explicit and implicit transaction control, isolation levels, and how to configure and use them in MySQL with practical SQL examples and code snippets.

ACIDIsolation LevelMySQL

0 likes · 22 min read

Database Transactions: ACID Properties, Isolation Levels, and Usage in MySQL

Java Captain

May 24, 2025 · Databases

Migrating a Project from MongoDB to MySQL: Design Considerations and Demo

This article discusses the motivations, comparative analysis, and practical steps for refactoring a Java backend project by replacing MongoDB with MySQL, covering pain points, selection criteria, schema redesign, entity mapping, and sample query code.

Database MigrationJavaMongoDB

0 likes · 14 min read

Migrating a Project from MongoDB to MySQL: Design Considerations and Demo

Java Captain

May 24, 2025 · Backend Development

Design and Implementation of a Notification System (Part 1) – Requirements Analysis, Data Model, and Key Process Design

This article introduces the design of a standalone notification‑system microservice, covering its functional requirements, conceptual and logical data models, and key workflow diagrams to guide implementation in Java‑based internet projects.

Notification Systemdata modelingmicroservice

0 likes · 8 min read

Design and Implementation of a Notification System (Part 1) – Requirements Analysis, Data Model, and Key Process Design

Java Captain

May 23, 2025 · Backend Development

Resolving Spring Boot Resource Loading Errors When Running from a JAR

This article explains why a Spring Boot application fails to locate a template file when packaged as a JAR, details the step‑by‑step debugging process, and provides code solutions using ClassPathResource or PathMatchingResourcePatternResolver to correctly read resources inside the JAR.

BackendDebuggingJava

0 likes · 5 min read