Spring Boot Box

A modular Spring Boot project designed to explore, implement, and master various functionalities and database integrations. Each module is self-contained and focuses on a specific feature, built with Test-Driven Development (TDD) at its core. This project serves as a learning and demonstration platform for best practices in Spring Boot development.

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Project Structure

spring-boot-box/
├── settings.gradle.kts          # Gradle settings for module management
├── Makefile                     # Build, test, and run commands using Makefile
├── gradlew                      # Gradle wrapper script
├── gradlew.bat                  # Gradle wrapper for Windows
├── build.gradle.kts             # Root Gradle configuration
├── README.md                    # Project documentation
├── app-db-h2-connection/            # Module for H2 database integration
├── app-db-postgres-connection/      # Module for PostgreSQL integration
├── app-db-mysql-connection/         # Module for MySQL integration
├── app-db-mongo-connection/         # Module for MongoDB integration
├── app-spring-security-basic        # Module for Spring security (RBAC)
├── app-reactive-webflux-basic       # Module for Spring Reactive webflux basic
├── app-(future modules...)          # Additional modules for extended functionalities

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Purpose and Philosophy

Key Goals:

1. Modular Design:
   • Each module is independent and focuses on a specific feature or database.
   • Enables easy experimentation and integration of new ideas.
2. TDD-Driven Development:
   • Writing tests first to drive the implementation.
   • Ensures reliable, maintainable, and bug-free code.
3. Learning-Focused:
   • A sandbox for learning Spring Boot features, database integrations, and advanced concepts.

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Makefile Integration

This project uses a Makefile to simplify build, test, run, and other operations. The Makefile provides a consistent interface for managing project tasks across different environments. For Windows users, you can install make using Chocolatey by running the following command:

choco install make

Current Modules

1. app-db-h2-connection

• Purpose: Demonstrates integration with H2, an in-memory database.
• Features:
  • Quick prototyping and testing with in-memory persistence.
  • RESTful APIs for CRUD operations.
  • End-to-end tests for each feature.
  • In the same project Introduced Behavior-Driven Development (BDD) using Cucumber. (TODO service)

2. app-db-postgres-connection

• Purpose: Demonstrates integration with PostgreSQL.
• Features:
  • Production-grade persistence with PostgreSQL.
  • Proper connection pooling and configuration.
  • RESTful APIs and corresponding test cases.

3. app-db-mysql-connection

• Purpose: Demonstrates integration with MySQL.
• Features:
  • Full MySQL database support for production use.
  • Comprehensive CRUD APIs.
  • Extensive testing for all operations.

4. app-db-mongodb-connection

• Purpose: Demonstrates integration with MongoDB, a NoSQL database.
• Features:
  • Flexible schema design for NoSQL use cases.
  • RESTful APIs for CRUD operations.
  • Comprehensive test cases to ensure functionality.
  • Suitable for projects requiring horizontal scalability.

5. app-spring-security-basic

• Purpose: Kick-start with Spring security (1.0).
• Features:
  • A simple application with handle the Role based Access Control.
  • Created RESTful APIs with Role based authorization.
  • Created test to handle Role based authorization.

6. app-reactive-webflux-basic

• Purpose: Kick-start with Spring Reactive Webflux.
• Features:
  • A simple application with handle the Tasks (same as todo application).
  • Created RESTful APIs with help of Reactive Components such as Mono, Flux.
  • Created test to handle CRUD operations.

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Future Plans

Planned Modules:

1. Spring Security Integration 2.0:
   • Implement basic authentication and authorization.
   • Secure endpoints using Spring Security features.
2. Reactive Programming with WebFlux 2.0:
   • Add R2DBC for reactive database operations with other databases and with increase level complexity.
3. Advanced Functionalities:
   • Explore Spring Cloud for microservices.
   • Build inter-service communication and monitoring.

Testing Enhancements:

• Add mutation testing with PIT (Pitest).
• Focus on integrating test automation pipelines.

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Getting Started

Prerequisites

• Java 17+ (or preferred version).
• Gradle (build tool).

Using the Makefile

1. Build and Test All Modules:

    make all

2. Build Modules:

    make

3. Clean All Build Files:

    make clean

4. Run the Root Spring Boot Application: (by default it runs h2 application)

    make run

5. Run the Specific Application: (e.g. h2 application)

    make run-h2

6. Build and Test a Specific Module:

    make run-module

7. Testing Run all tests for the module:

    make test

8. Help

    make help

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OpenAPI Integration

The project leverages OpenAPI to provide interactive API documentation. This makes it easy to explore and test the REST APIs for each module.

How to Access OpenAPI Documentation:

1. Start the Spring Boot application.
2. Navigate to the following URL in your browser

       http://localhost:8080/swagger-ui/index.html

   • Replace 8080 with the appropriate port if a different one is configured.
3. Explore the API endpoints, input parameters, and responses in an interactive interface.

Note: In Case of Reactive WebFlux projects navigate to below URL:

    http://localhost:8080/swagger-ui.html

Contributions

Contributions are welcome! Feel free to fork the repository, create a new module, or enhance the existing ones.

• View Repository on GitHub

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Author

Vishwajeet Kotkar

• A passionate developer focused on mastering Spring Boot, Test-Driven Development, and modern software practices.

Connect on LinkedIn or explore my other projects on GitHub.