The Spring Boot Leave Management API is a Java project that combines Entity models and API documentation, built with MySQL / PostgreSQL. The project follows a clean, modular architecture where input handling, business logic, and presentation stay separated, making it easy to test, extend, and present. It showcases practical Java techniques while producing a working, demo-ready application.
Manual and paper based methods for this task are slow, error-prone, and hard to manage. Without a Java application built on API documentation and MySQL / PostgreSQL, users cannot process, store, and manage data efficiently, and there is no reliable, reusable way to run the workflow.
This project applies Java techniques through Entity models, orchestrated with MySQL / PostgreSQL and API documentation. The application is designed for correctness and usability, with clean data flow, validation, and error handling. It produces consistent, reusable results and can be adapted to related tasks with minimal changes.
MySQL / PostgreSQL
Lombok
Java 17+
Maven / Gradle
Object oriented design
Testing and debugging
Spring Boot
Spring Data JPA
Modular Java application around Entity models and API documentation
Configurable settings and validation rules
Clear logging, error handling, and reporting
Clean interface for user interaction
Reusable components for related features
Unit testing and maintainable code
The project is layered: the input layer handles user interaction through Entity models; the logic layer implements business rules with MySQL / PostgreSQL and API documentation; and the output layer presents results via Services. Shared validation, storage, and logging modules support all layers, keeping the application robust and easy to extend.
Set up the Java project, dependencies, and environment.
Build the input and model layer with Entity models.
Implement the core business logic using MySQL / PostgreSQL and API documentation.
Add the output and presentation layer via Services.
Wire up end-to-end flows with validation and error handling.
Write tests, run the application, and refine features.
Package the project, document it, and prepare the demo and viva report.
Build production-style Java applications
Apply Building REST APIs and Spring Data JPA
Design classes and manage data in Java
Work with Java frameworks and libraries
Present and defend a complete Java project in viva
Expose the application as a REST API
Add a database for persistent storage
Add a modern GUI or web interface
Deploy to a cloud platform
The Spring Boot Leave Management API delivers a complete Java workflow — from input handling and business logic to output and presentation. It is practical, modern, and easy to explain, making it an excellent final year project that demonstrates in-demand Java skills.
