ExamHub Microservices Project

ExamHub is an online exam system built with Spring Boot and Spring Cloud Microservices Architecture.

Architecture & Services

1. Eureka Server (8761): Service Registry.
2. API Gateway (8080): Central entry point to the system, validates JWT tokens.
3. Auth Service (8081): Manages user registration and login (generates JWTs). connects to examhub_auth.
4. Exam Service (8082): Manages exams and questions. connects to examhub_exam.
5. Result Service (8083): Evaluates exams. connects to examhub_result.

Prerequisites / Necessities

• Java 17+ (Backend microservices)
• Maven (Backend dependencies)
• MySQL (Database)
• Node.js (v18+) & npm (To run the React frontend)
• Git (For version control)

Setup Instructions

1. Database Creation

Open MySQL shell or Workbench and run:

CREATE DATABASE examhub_auth;
CREATE DATABASE examhub_exam;
CREATE DATABASE examhub_result;

Ensure your MySQL credentials are root / Aastha19@ on localhost:3306, or update application.properties in each service. The tables will be auto-created by Hibernate.

2. Build the Project

In each folder (eureka-server, api-gateway, auth-service, exam-service, result-service), run:

mvn clean install

3. Run the Services

Run each service in this specific order:

1. Eureka Server: mvn spring-boot:run
2. API Gateway
3. Auth Service
4. Exam Service
5. Result Service

Check http://localhost:8761 to verify all services are registered with Eureka.

Postman API Examples

Note

For all requests except Auth, pass the JWT token in the Authorization header as Bearer <token>.

1. Register User (Auth Service)

POST http://localhost:8080/auth/register

{
    "name": "Student One",
    "email": "student1@example.com",
    "password": "password123",
    "role": "ROLE_STUDENT"
}

2. Login User (Auth Service)

POST http://localhost:8080/auth/login

{
    "email": "student1@example.com",
    "password": "password123"
}

Response will be your raw JWT token string. Keep this token for further requests.

3. Create Exam (Exam Service - API Gateway)

POST http://localhost:8080/api/exams/create Headers: Authorization: Bearer <TOKEN>

{
    "title": "Java Basics",
    "description": "Basic Java terminology and concepts"
}

4. Add Question to Exam (Exam Service)

POST http://localhost:8080/api/exams/{exam_id}/questions Headers: Authorization: Bearer <TOKEN>

{
    "text": "What is JVM?",
    "optionA": "Java Viral Machine",
    "optionB": "Java Virtual Machine",
    "optionC": "Java Visual Machine",
    "optionD": "None",
    "correctOption": "B"
}

5. Submit Exam (Result Service)

POST http://localhost:8080/api/results/submit Headers: Authorization: Bearer <TOKEN>

{
    "examId": 1,
    "userId": 1,
    "answers": {
        "1": "B"
    }
}