java-labs

Reorganized Java lab workspace with multiple learning sites and GitHub Pages friendly entrypoints.

Live site: Java Labs

Java Labs is a Java backend learning repository and a static GitHub Pages learning portal at the same time.

The learning portal currently includes:

• Interview Practice Site: topic-based study with questions, answers, explanations, code examples, and self-practice prompts.
• Interview Levels Site: interview question hub grouped by Basic / Intermediate / Advanced.
• Quiz Site: randomized quiz sets to evaluate your level across Fresher / Interview / Senior.
• Roadmap Site: Java backend learning roadmap, technology map, integration flow, and knowledge tree.

Learning Sites

• Interview Practice Site
• Interview Levels Site
• Quiz Site
• Roadmap Site

Main Structure

java-labs/
├── index.html              # Redirects to the portal inside docs
├── docs/                   # Static learning portal for GitHub Pages
│   └── assets/
│       ├── css/            # Shared styles for the static sites
│       └── js/             # Shared JavaScript for rendering JSON content
├── scripts/                # Helper scripts for running modules and checks
├── basic/                  # Java core practice
├── spring/                 # Spring Boot practice project
└── notification-service/   # Event consumer service

GitHub Pages

There are two practical ways to host the portal:

1. Host from the repository root

• Root index.html redirects to docs/index.html

2. Host from the docs folder

• Open Settings -> Pages
• Choose Deploy from a branch
• Select your main branch and the /docs folder

If your repository is java-labs under the thanhson99 account, the live URL will look like:

https://thanhson99.github.io/java-labs/

Static Learning Portal

The portal inside docs/ uses:

• HTML
• CSS
• JavaScript
• JSON

There is no database. Content is loaded from JSON files so the portal can keep growing with:

• theory questions
• interview questions
• code questions and trick questions
• static quizzes
• roadmap and technology guides

Getting Started

1. Basic Java module

cd basic
./mvnw -q -DskipTests compile
java -cp target/classes com.example.javalabs.basic.LearningApp

Run tests:

./mvnw test

Or from the repository root:

./scripts/run.sh basic

2. Spring Boot module

cd spring
./mvnw spring-boot:run

Or from the repository root:

./scripts/run.sh spring

Example:

./scripts/run.sh spring
JAVA_VERSION=17 PORT=8095 ./scripts/run.sh spring

The Spring module currently includes:

• REST API
• request validation
• H2 + JPA + Flyway
• analytics JDBC datasource
• transaction rollback demo
• JWT authentication
• refresh token rotation
• logout / logout-all
• Kafka + RabbitMQ publishers/consumers
• outbox pattern
• retry + dead-letter handling
• Actuator health + metrics
• Postgres profile with Docker Compose
• Testcontainers integration tests

Useful endpoints:

GET  /hello?name=Spring
POST /api/auth/token
POST /api/auth/refresh
POST /api/auth/logout
POST /api/auth/logout-all
POST /api/users/register
POST /api/users/register-demo?failAfterAudit=true
GET  /api/users/{userId}
GET  /api/system/dashboard
GET  /api/system/overview
GET  /actuator/health
GET  /actuator/info
GET  /h2-console

Protected /api/** endpoints require:

Authorization: Bearer <jwt>

Demo credentials:

student / student123 -> USER
admin / admin123 -> ADMIN, USER