💰 Banking Application - Spring Boot REST API

A secure, role-based online banking backend built using Java, Spring Boot, and JWT Authentication. It supports user registration, login, money transfers, and loan management. Designed for both Customer and Admin roles.

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📄 Description

This project simulates a core banking system. It includes complete REST APIs for:

• User registration & login
• Money transfers between users
• Loan application and repayment system
• Admin functionalities like user overview and loan approvals

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🔧 Tech Stack

• Java 17
• Spring Boot 3
• Spring Security (JWT)
• JPA + Hibernate
• MySQL
• Swagger (OpenAPI)
• SonarCloud
• Postman (for API testing)

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🔐 Key Features

👤 User

• Register and log in securely using JWT tokens
• View account info, balance, and loan status
• Deposit, withdraw, and transfer money
• Apply for different types of loans
• Repay loan with real-time updates

🛡️ Admin

• View total users, system-wide balance
• Approve or reject loan applications
• Create other admin accounts securely

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📑 API Endpoints (Examples)

🔓 Public

• POST /login – Login with credentials
• POST /public/register-user – User Registration
• POST /login/register-admin – Admin Registration

👤 User

• GET /user/info – Get user account info
• POST /user/deposit – Deposit money
• POST /user/withdraw – Withdraw money
• POST /user/transfer – Transfer money
• POST /user/loan/apply – Apply for a loan
• GET /user/loan/status – View loan status
• POST /user/loan/repay – Repay loan amount

🛡️ Admin

• GET /admin/summary/balance – View total system money
• GET /admin/summary/users – View total number of users
• GET /admin/loans/pending – View pending loan applications
• PUT /admin/loans/{loanId}/approve – Approve a loan
• PUT /admin/loans/{loanId}/reject – Reject a loan

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🗃️ Database Schema (Simplified)

• User: id, accountNumber, roles, balance, etc.
• Loan: id, accountNumber, loanType, amount, interestRate, status, amountPaid
• Transaction: id, fromAccount, toAccount, amount, timestamp

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🖼️ Swagger UI

Visit: http://localhost:8080/swagger-ui.html

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🚀 Getting Started

1. Clone the repo

git clone https://github.com/yourusername/banking-app.git
cd banking-app