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This tutorial explains how to extend Spring Security's OAuth2 authorization server by implementing a custom SMS‑code grant type, covering the necessary configuration classes, bean definitions, token store setup, and client usage examples.
This article provides a complete walkthrough of Nginx, covering its roles as a reverse proxy, load balancer, static file server, and forward proxy, along with detailed configuration examples for global settings, HTTP blocks, server blocks, location directives, upstream modules, and stream handling.
This article walks through preparing a four‑node MySQL environment, configuring password‑less SSH, setting up master‑slave replication with GTID, installing and configuring MHA, testing connectivity, running the manager, verifying automatic failover, and highlighting the key advantages of using MHA for high availability.
This article explains the fundamentals of OAuth2, its four grant types and roles, and provides step‑by‑step Spring Boot and Spring Cloud configurations—including authorization and resource server setup, custom token filters, and Zuul gateway integration—to secure microservice APIs.
This article explains Java's throw‑catch mechanism, the three core principles of exception handling, and demonstrates how to design a custom exception hierarchy and a Spring Boot @ControllerAdvice‑based global handler to simplify error processing and improve code maintainability.
This article explains how to use Maven parent POMs, properties, and BOM (Bill of Materials) to centrally manage version numbers across multi‑module Java projects, resolve dependency conflicts, and simplify builds for backend development teams.
