Event Horizon

A full-stack event booking system with a Java HTTP backend, vanilla HTML frontend, no frameworks, no build tools, no external libraries.

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Overview

Event Horizon is a two-tier web app for managing and booking events. The backend is a raw Java HTTP server using only the JDK's built-in com.sun.net.httpserver. Data is persisted to local .dat files. The frontend is a single HTML file that talks to the backend via REST. Users can register, browse events, and book or cancel tickets. Admins can create and delete events.

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Features

Feature	Description
User Auth	Register and login with username/password; sessions stored in localStorage
Role System	Admin and regular user roles; admin flag set at registration
Event Browsing	View all events with name, date, and available ticket count
Ticket Booking	Book one ticket per action; capacity enforced server-side
Ticket Cancellation	Users can void their own tickets; seat count is restored
Admin Panel	Admins can create events (ID, name, date, capacity) and delete them
File Persistence	Users, events, and tickets saved to users.dat, events.dat, tickets.dat
Default Admin	A default admin / admin123 account is created on first run
Zero Dependencies	Backend uses only standard JDK — no Maven, no Gradle, no third-party JARs

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Tech Stack

Backend        : Java (com.sun.net.httpserver) — runs on port 8080
Frontend       : HTML5, Tailwind CSS (CDN), Vanilla JavaScript
Persistence    : Java Object Serialization (.dat files)
Fonts          : JetBrains Mono, Playfair Display (Google Fonts)

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Running the Project

Both files need to be in the same directory. The Java backend must be running before you open the HTML file.

Step 1: Compile the backend

javac EventHorizon.java

Step 2: Start the server

java EventHorizon

The server starts on http://localhost:8080. You should see it running with no output unless an error occurs. Three .dat files will be created in the same directory on first run.

Step 3: Open the frontend

Open index.html directly in your browser:

# macOS
open index.html

# Linux
xdg-open index.html

# Windows
start index.html

Or just double-click index.html in your file explorer.

Default Admin Credentials

Username : admin
Password : admin123

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API Endpoints

All endpoints are served at http://localhost:8080/api.

Method	Endpoint	Description
POST	/api/register	Register a new user
POST	/api/login	Login and receive user info
GET	/api/events	List all events
POST	/api/events	Create a new event (admin)
DELETE	/api/events	Delete an event by ID (admin)
GET	/api/tickets?username=X	Get tickets for a user
POST	/api/tickets	Book a ticket
DELETE	/api/tickets	Cancel a ticket

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Author

Gummadi Likith