Primarily covers fundamental Java concepts, mainstream frameworks, deep dives into underlying principles, and JVM internals.
This article explains how Spring’s @Autowired can inject List, Set, and Map collections, detailing injection mechanisms, code examples, workflow steps, common use cases like plugin systems and filter chains, and advanced tips such as @Qualifier, custom ordering, and handling pitfalls.
This article explains the distinct roles of Spring's BeanFactory and FactoryBean, compares their functionalities, outlines how to retrieve beans and FactoryBeans, and provides practical code examples and usage scenarios for creating complex objects within the Spring IoC container.
This article explains how Spring's @Autowired annotation can inject collections such as List, Set, and Map, detailing injection mechanisms, ordering, practical examples like filter chains and validators, advanced features like @Qualifier and custom ordering, and important considerations such as circular dependencies and performance impacts.
This article explains the differences between Spring's @Autowired and JSR‑250's @Resource annotations, covering their injection strategies, supported features, usage examples, comparison tables, and performance considerations for backend developers.
This article explains Spring AOP fundamentals—including aspects, advice types, pointcuts, join points, and advice parameters—provides detailed code examples for each component, outlines the AOP workflow, showcases common use cases, and demonstrates a complete logging implementation with practical code snippets.
This article explains the three Spring bean initialization callbacks—@PostConstruct, InitializingBean, and init‑method—their fixed execution order, underlying processing mechanisms, code examples, and guidance on choosing the most suitable approach for different development scenarios.
ZooKeeper is an open‑source distributed coordination service that provides a simple, efficient mechanism for managing shared state, and this guide explores seven typical scenarios—including distributed locks, service registration, configuration management, queues, leader election, notifications, and barriers—complete with Java code examples and usage details.
This article explains why Zookeeper's watch mechanism triggers only once, outlines the performance, reliability, and design reasons behind it, describes its asynchronous eventual consistency, and provides Java code examples for basic watches, manual re‑registration, and using the Curator framework for persistent listeners.
This article explains how ZooKeeper provides reliable distributed locks using ordered temporary nodes and watchers, details the underlying mechanisms, step‑by‑step implementation in Java, compares Curator framework options, and discusses the advantages, drawbacks, and real‑world use cases.
RabbitMQ often suffers from duplicate message consumption due to network glitches, node failures, or ACK issues, but you can eliminate repeats by implementing idempotent processing, using caches or deduplication tables, and leveraging manual acknowledgments or the Message Deduplication plugin, as illustrated with Java examples.
