RestClient in Spring Boot: Simple Guide to Synchronous Microservice Communication If you are learning Spring Boot Microservices, you will often see one service calling another service. For example: Order Service…
RestClient in Spring Boot – Modern Alternative to RestTemplate (Deep Dive into Fluent API, Internals & Interceptors) In the previous part, we understood why RestTemplate is no longer the best…
Synchronous Communication Between Microservices in Spring Boot (OrderService ↔ ProductService using RestTemplate & RestClient) In a real-world microservices architecture, services rarely live in isolation. They constantly need to talk to…
Role-Based Authorization in Spring Boot using @PreAuthorize and @PostAuthorize In modern Spring Boot applications, security is not just about authentication (who you are) but also about authorization (what you…
OAuth 2.0 vs OIDC – Complete Guide with Stateless Spring Boot Implementation OAuth is one of the most misunderstood topics in security. Most developers use it daily (Google login,…
OAuth 2.0 – Complete Guide (High Level Design) What is OAuth 2.0? OAuth stands for Open Authorization. It is an authorization framework, not authentication. It allows: Secure third-party applications…
JWT Authentication in Spring Boot – Full Implementation Guide We will implement: User Registration Token Generation (Login) JWT Validation Filter Custom Authentication Provider Secured APIs Refresh Token Step 1…
JWT (JSON Web Token) – Complete Notes What is JWT? JWT (JSON Web Token) is a stateless authentication mechanism used to securely transmit information between parties as a JSON…
Basic Authentication in Spring Security – Complete Guide Basic Authentication is one of the simplest authentication mechanisms supported by Spring Security. It is easy to implement, widely supported, and…
Form Login Authentication in Spring Security – A Complete Guide Form Login Authentication is the default authentication mechanism in Spring Boot Security. It is simple, powerful, and widely used…
