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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

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 CoordinationZAB Protocol

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.

account recoverymanual appealself-service

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.

ACIDDatabaseIsolation Level

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.

JavaMongoDBdatabase migration

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.

MicroserviceNotification SystemProcess Design

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.

DebuggingJARJava

0 likes · 5 min read

Resolving Spring Boot Resource Loading Errors When Running from a JAR

Java Captain

May 23, 2025 · Backend Development

CompressUtil Java Utility for File Compression and Download

This article introduces a Java utility class named CompressUtil that provides methods for compressing files and directories into ZIP archives, handling duplicate filenames, creating new files safely, and offering HTTP endpoints for downloading the generated ZIP files in a single request.

File CompressionServletutility

0 likes · 10 min read

CompressUtil Java Utility for File Compression and Download

Java Captain

May 23, 2025 · Backend Development

Common Causes of Kafka Message Loss and Mitigation Strategies

This article examines the typical reasons Kafka messages are lost across producers, brokers, and consumers, and provides detailed configuration recommendations and best‑practice solutions to significantly reduce the risk of data loss in distributed streaming systems.

BrokerConsumerKafka

0 likes · 15 min read

Common Causes of Kafka Message Loss and Mitigation Strategies

Java Captain

May 21, 2025 · Backend Development

Graceful Shutdown of Spring Boot Applications Using JVM Signals and Actuator

The article explains how to achieve graceful shutdown of Spring Boot services by handling Linux kill signals, registering JVM shutdown hooks, and exposing an Actuator REST endpoint that safely releases resources, stops beans, and terminates the JVM without data loss.

ActuatorGraceful ShutdownJVM

0 likes · 11 min read

Graceful Shutdown of Spring Boot Applications Using JVM Signals and Actuator