Spring Boot

Spring Boot REST API : Upload & Download files

📦 Tech Stack Spring Boot Spring Web (REST) Multipart support (MultipartFile) File System for storage 📁 1. Maven Dependencies (pom.xml) <dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-web</artifactId></dependency> 🛠️ 2. Controller Class –...

REST API Fallback mechanism!

Handling API calls when the client or server is down requires planning for resilience, retries, and fallback mechanisms. Here’s how to approach it: ✅ 1. Clarify Who is Down Scenario...

SonarQube integration with Spring Boot

✅ What is SonarQube? SonarQube is an open-source code quality and security analysis tool. It scans your source code to detect: Bugs 🐞 Code smells 🧹 Vulnerabilities 🔓 Duplications 🔁...

✅ Session Management in Spring Boot

Session management in Spring Boot is about tracking user state across multiple HTTP requests — typically used for login sessions, shopping carts, etc. 🧱 1. Default Behavior (HTTP Session) Spring...

Input Validation in REST API (Spring Boot)

Validating inputs for a REST API in Spring Boot is typically done using Java Bean Validation (JSR-380) with annotations like @NotNull, @Size, @Email, etc., and the @Valid or @Validated annotation...

✅ CrudRepository vs JpaRepository

Feature CrudRepository JpaRepository 📦 Package org.springframework.data.repository org.springframework.data.jpa.repository 🔁 Inheritance Base interface for CRUD operations Extends PagingAndSortingRepository & CrudRepository 🔨 Basic CRUD (save, findById, delete) ✅ Yes ✅ Yes 📄 Pagination...