Event Management System — Phase 1

A RESTful Event Management API built with Spring Boot 3.x as part of a progressive learning journey from monolith to microservices.

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About This Project

This is Phase 1 of a 5-phase project designed to learn the entire Spring ecosystem by building a real application. Each phase adds new technologies on top of a working foundation.

Phase	Focus	Status
Phase 1	Core REST API — Spring Boot, JPA, H2, Lombok	✅ Complete
Phase 2	Persistence & Logic — MySQL, Flyway, Validation, MapStruct, JUnit	🔜 Next
Phase 3	Speed & Search — Redis, Elasticsearch, Swagger	🔜 Planned
Phase 4	Security — Spring Security, OAuth2, Spring AI	🔜 Planned
Phase 5	Cloud & Microservices — Docker, Kafka, GitHub Actions	🔜 Planned

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Project Structure

src/
├── main/
│   ├── java/com/events/
│   │   ├── EventManagementApplication.java     # Entry point
│   │   ├── controller/
│   │   │   └── EventController.java            # REST endpoints
│   │   ├── service/
│   │   │   ├── EventService.java               # Service interface
│   │   │   └── impl/
│   │   │       └── EventServiceImpl.java       # Business logic
│   │   ├── repository/
│   │   │   └── EventRepository.java            # Data access layer
│   │   ├── entity/
│   │   │   └── Event.java                      # JPA entity / DB table
│   │   └── exception/
│   │       ├── GlobalExceptionHandler.java     # @RestControllerAdvice
│   │       ├── ResourceNotFoundException.java  # Custom 404 exception
│   │       └── ErrorResponse.java              # Error response model
│   └── resources/
│       └── application.properties              # App configuration
└── test/
    └── java/com/events/
        └── EventManagementApplicationTests.java

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Architecture

This project follows a 3-tier layered architecture:

HTTP Request
     ↓
Controller Layer     → receives HTTP, delegates to service
     ↓
Service Layer        → business logic, validates rules
     ↓
Repository Layer     → database operations via JPA
     ↓
H2 In-Memory DB

Exceptions thrown at any layer are caught by GlobalExceptionHandler and returned as clean JSON responses.

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API Endpoints

Base URL: http://localhost:8080/api/events

Method	Endpoint	Description	Status Code
GET	/api/events	Get all events	200 OK
GET	/api/events/{id}	Get event by ID	200 OK
POST	/api/events	Create new event	201 Created
PUT	/api/events/{id}	Update existing event	200 OK
DELETE	/api/events/{id}	Delete event	204 No Content

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Getting Started

Prerequisites

• Java 17 or higher
• Maven 3.x
• IntelliJ IDEA (recommended) or any IDE
• Postman (for API testing)

Run the Application

1. Clone the repository

git clone https://github.com/yourusername/event-management.git
cd event-management

2. Build the project

mvn clean install

3. Run the application

mvn spring-boot:run

The application starts on http://localhost:8080

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H2 Database Console

While the app is running, visit the H2 web console to inspect your data live:

URL:      http://localhost:8080/h2-console
JDBC URL: jdbc:h2:mem:eventsdb
Username: sa
Password: (leave empty)

Run SELECT * FROM events to see all your data in real time.

Note: H2 is an in-memory database. All data is lost when the application stops. This is replaced with MySQL in Phase 2.

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Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

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License

This project is licensed under the MIT License — see below for details.

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MIT License

Copyright (c) 2025

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.