SpringBoot Collections

A collection of Spring Boot and related full-stack sample projects covering security, CRUD APIs, MongoDB, Eureka service discovery, AWS Lambda deployment, and React UI integration.

Overview

This repository groups multiple independent examples:

• SpringSecurityJWT – JWT auth sample
• SpringSecurityApp – role-based authorization sample
• crudapp – Spring Boot CRUD backend
• crud-ui – React frontend for CRUD flows
• spring-boot-mongodb – MongoDB query examples
• EurekhaHelloWorld – Eureka producer/consumer sample
• aws-lambda-springboot-api-main – Spring Boot packaged for AWS Lambda/API Gateway

Architecture / Stack

• Java + Spring Boot (multiple modules)
• Spring Security (JWT + role-based auth)
• MongoDB (for selected demos)
• React (for crud-ui)
• Maven / Maven Wrapper

flowchart TD
  A[Collection Repo] --> B[Security Samples]
  A --> C[CRUD Samples]
  A --> D[Cloud Samples]
  B --> B1[SpringSecurityJWT]
  B --> B2[SpringSecurityApp]
  C --> C1[crudapp API]
  C --> C2[crud-ui React]
  C --> C3[spring-boot-mongodb]
  D --> D1[Eureka Producer/Consumer]
  D --> D2[AWS Lambda SpringBoot]

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Quickstart

Prerequisites

• Java 17+ (some modules may work on older versions, but 17+ is recommended)
• Maven 3.8+
• Node.js 18+ (for crud-ui)
• MongoDB (for modules that require it)

Environment Variables

No single .env governs the whole monorepo.

Common runtime configuration is handled with application.properties/application.yml inside each module. For cloud modules, supply credentials via your deployment environment (not committed files).

Run

Run modules independently from their own directories.

Example: SpringSecurityJWT

cd SpringSecurityJWT
./mvnw spring-boot:run

Example: crudapp backend

cd crudapp
mvn spring-boot:run

Example: crud-ui frontend

cd crud-ui
npm install
npm start

Test

Per module:

# Maven-based modules
mvn test

# Wrapper-based modules
./mvnw test

crud-ui supports React scripts test command where applicable:

cd crud-ui
npm test

Deployment

• AWS Lambda module: see aws-lambda-springboot-api-main/README.md
• Other modules: package JAR and deploy as standard Spring Boot apps

mvn clean package
java -jar target/*.jar

API Snippets (Representative)

From crudapp:

• GET /users
• GET /users/{name}
• POST /load
• GET /delete/{name}

Request (POST /load):

{
  "name": "Jane",
  "email": "jane@example.com"
}

From SpringSecurityJWT:

• GET /api/v1/awt
• POST /api/v1/awt/auth

Request (POST /api/v1/awt/auth):

{
  "username": "user",
  "password": "password"
}

Response: JWT token string.

Troubleshooting

• Port conflicts: multiple apps default to 8080; change server.port per module.
• Mongo connection issues: verify local MongoDB is running and connection URI is correct.
• Maven wrapper permission denied: run chmod +x mvnw.
• Dependency mismatches: run mvn -U clean install.

Changelog

See CHANGELOG.md.

License

No LICENSE file is currently present in this repository. To avoid assuming legal intent, this docs update does not add one.