ticketr

simple event ticket system. web-based sales and management with role-based access, real-time availability, and concurrency-safe purchase handling.

description

ticketr provides:

• two roles: normal user and administrator
• real-time ticket availability
• concurrency control to prevent overselling

stack

technology	version	purpose
java	21	runtime
spring boot	3.x	backend
thymeleaf	3.1	server-side templates
bootstrap	5.3	ui
mysql	8.0+	database
spring security	6.x	auth and authorization

architecture

browser  -->  spring boot (mvc)  -->  mysql

package layout

src/main/java/com/example/sistemaboletos/
  config/       security and app configuration
  controller/   http handlers and navigation
  model/        entities (Usuario, Evento, Compra, Rol, EntidadBase)
  model/servicio/  service interfaces and implementations
  repository/   jpa data access
  SistemaBoletosApplication.java

features

auth

• login and registration
• default admin account: admin@admin.com / admin123

events (admin only)

• crud at /admin/eventos
• list: GET /admin/eventos
• save: POST /admin/eventos/guardar
• delete: GET /admin/eventos/eliminar/{id}

purchases

• concurrency-safe ticket purchase via @Transactional and synchronized in EventoServiceImpl.comprarBoletos()

run

prerequisites: jdk 21+, mysql 8.0+, maven

1. create database:

   CREATE DATABASE sistema_boletos;

2. copy the env file and set your credentials:

   cp .env.example .env

3. start the app:

   mvn spring-boot:run

requirements checklist

area	requirement	how it is met
architecture	client-server	spring boot backend, thymeleaf/bootstrap frontend
concurrency	thread safety	@Transactional + synchronized in EventoServiceImpl.comprarBoletos() (code)
security	authentication	spring security; /admin/** restricted by role
persistence	full crud	jpa repositories for users, events, purchases, tickets
validation	error handling	purchase validation and spring security error views (e.g. login?error)
data structures	generic collections	List<T>, Optional<T>, security context maps
oop	abstract class	EntidadBase for shared id
oop	enum	Rol (USER, ADMIN)
oop	interface	IEventoService implemented by EventoServiceImpl

license

MIT License, see LICENSE.