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This tutorial explains the JWT structure, shows how to add custom claims such as user ID, department and roles, implements token blacklisting for logout, handles refresh token logic, and provides step‑by‑step code and testing instructions for a Spring Security OAuth2 authentication system.
This tutorial walks through why OAuth2 is needed, its advantages, the project layout, Maven dependencies, YAML configurations, Java security and JWT setup, resource‑server integration, testing steps, and a side‑by‑side comparison of the four OAuth2 grant types, all with complete code examples.
This article shows how to replace traditional installable serial‑debug tools with a browser‑based, cross‑platform serial assistant that uses the Web Serial API for direct hardware access and Spring Boot 3 with WebSocket to relay data to the cloud, including architecture, code examples, and deployment pitfalls.
This article walks through the complete load‑testing and performance‑tuning workflow for a Spring Cloud microservice application, covering environment preparation, JMeter script creation, benchmark execution, bottleneck analysis, JVM, database pool, and Sentinel optimizations, and presents before‑and‑after results with a detailed checklist.
This article walks through migrating a Spring Cloud microservice suite from local Docker Compose to a production‑grade Kubernetes deployment, covering namespace setup, ConfigMaps, Secrets, service deployments, auto‑scaling, rolling updates, self‑healing, load balancing, Docker image builds, deployment scripts, common operational commands, and validation steps.
After building the order, stock, and point services along with Nacos, Seata, Sentinel, Prometheus, Grafana, and SkyWalking, this guide shows how to package all components into Docker images and use a single Docker Compose command to start the entire microservice system with one click, while addressing common pitfalls.
After solving distributed transactions with Seata, this tutorial shows how to add complete observability to Spring Cloud microservices by integrating Micrometer, Prometheus, and Grafana, covering metrics pillars, configuration, custom business metrics, dashboard setup, alert rules, validation steps, and common pitfalls.
This tutorial walks through why distributed transactions are needed in a Spring Cloud order‑stock‑point scenario, compares local and distributed transaction models, introduces Seata’s architecture and three transaction modes, shows environment setup, code implementation, testing steps, and common pitfalls with solutions.
After solving service fault tolerance with Sentinel, this guide shows how to add SkyWalking to a Spring Cloud microservice stack, configure the OAP, UI and Java agents, verify trace data, and troubleshoot common issues, enabling precise latency analysis and error localization across services.
This article walks through adding Alibaba Sentinel to a Spring Cloud microservice suite to protect against service outages, traffic spikes, and slow calls by configuring rate limiting, circuit breaking, and fallback mechanisms across user, order, and gateway services, with full Docker‑compose setup and testing steps.
