Former senior programmer at a Fortune Global 500 company, dedicated to sharing Java expertise. Visit Feng's site: Java Knowledge Sharing, www.java1234.com
Redis Cluster can lose writes due to asynchronous replication, network partitions, inadequate persistence settings, or unconfirmed client operations, but enabling AOF, configuring replication acknowledgments, using Sentinel or built‑in HA, and adding client retry logic can mitigate these risks, as demonstrated with a Java Jedis example.
A code‑review anecdote shows that developers often apply heavyweight patterns like Abstract Factory, Event Sourcing, CQRS, and DDD to simple payment processing, leading to unnecessary complexity; the article explains why this happens, which patterns truly belong in micro‑service backends, and offers practical, lightweight alternatives together with concrete code examples and review guidelines.
This article explains RabbitMQ's transaction mechanism, walks through the four-step process of opening, executing, committing, or rolling back a transaction, provides a complete Java example with Maven setup, and discusses performance impacts and when to prefer acknowledgments over transactions.
The article examines why a company might mandate POST for every API, compares GET and POST characteristics, discusses RESTful best‑practice expectations, highlights the hidden costs of over‑standardization, and presents a more nuanced approach to API design for dynamic and static services.
This article explains why raw collections are unsafe, how Java generics enforce compile‑time type safety, reduce casting, improve code readability, and boost performance, and it walks through generic interfaces, collections, custom generic classes, inheritance rules, diamond syntax, and common restrictions with concrete code examples and diagrams.
A production incident where payment requests succeeded but no order rows were inserted was traced to a missing commit in a special code path, causing a polluted connection to be reused by other services; the article details the debugging steps, root‑cause analysis, code fixes, and preventive measures.
This article explains Java's reflection mechanism, covering its main uses such as dynamic class loading, handling unknown types, accessing private members, and framework development, then walks through basic steps, a complete code example, and discusses its advantages and drawbacks.
The article explains why returning a generic Result wrapper from a Java service layer breaks responsibility separation, harms reusability, complicates exception handling and testing, and obscures transaction boundaries, advocating for returning pure domain objects instead.
This tutorial shows how to implement graceful dynamic data source switching in SpringBoot by combining ThreadLocal with AbstractRoutingDataSource, configuring master/slave databases, adding a @DS annotation with AOP support, and enabling runtime addition of new data sources.
This article walks through building a pure‑Java DOCX‑to‑PDF converter in Spring Boot using docx4j, compares it with alternatives, shows Maven dependencies, provides a utility class and controller example, and explains how to resolve Chinese font garbling on both Windows and Linux.
