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This step‑by‑step tutorial shows how to eliminate single‑point failures by deploying multiple service instances, registering them with Nacos, configuring Spring Cloud Gateway, and using the lb:// protocol to achieve automatic client‑side load balancing for resilient microservices.
This step‑by‑step guide shows how to integrate Spring Security into a Spring Boot project, configure Maven dependencies, define User, Role and Permission entities, set up MyBatis mappers, implement JWT generation and validation, and build the service, controller, and configuration layers for a complete authentication system.
This comprehensive guide walks you through migrating a Spring Boot 3.0 JavaWeb application from HTTP to HTTPS, covering certificate acquisition (including Let’s Encrypt), conversion to Java keystore, Spring Boot and reverse‑proxy configuration, application adjustments, automated renewal, testing, rollback, and ongoing monitoring.
This guide walks through the challenges of synchronizing tens of millions of records between heterogeneous MySQL databases, explains why traditional mysqldump or file‑based methods fail, and provides a step‑by‑step tutorial on installing, configuring, and using Alibaba's open‑source DataX tool for both full and incremental data synchronization.
This article explains why duplicate order submissions occur in e‑commerce systems and presents a comprehensive solution using request tokens, interface idempotency, and Redis‑based distributed locks, complete with Spring Boot code examples and advanced optimization tips.
This article explains why Java applications often start slowly, identifies the main culprits such as excessive class loading, bloated JARs, and reflection, and provides a comprehensive set of JVM, Spring Boot, code‑level, and deployment optimizations—including lazy loading, auto‑configuration pruning, GraalVM native images, and container probes—to dramatically reduce startup time and ace interview questions.
This article introduces LatchUtils, a lightweight Java utility that streamlines asynchronous task registration and waiting, compares it with manual CountDownLatch and CompletableFuture approaches, and demonstrates how it reduces boilerplate while keeping business logic clear and maintainable.
Learn how to generate various QR codes in Java—including login tokens, promotional URLs, and temporary visitor codes—by analyzing use cases, selecting the ZXing library, and following step‑by‑step code examples with best‑practice tips and common pitfalls.
This article explains why authentication loops occur when external user tokens and internal service tokens are handled together in Spring Security, and provides a step‑by‑step solution using distinct headers, custom filters, and Feign interceptors to break the cycle.
Learn how to treat Git like a “undo” button with clear analogies, essential command tables for beginners, step‑by‑step real‑world scenarios, safety tips for local versus remote rollbacks, and advanced tricks such as force‑push safeguards, making version‑control mishaps a thing of the past.
