# Java Assignment

### Task

Create a Spring Boot application that provides RESTful endpoints to manage a book library. The application should support CRUD operations for books, authors, and book rentals.

### Requirements

1. Data Models:
- `Book`: Contains fields like `id`, `title`, `author`, `isbn`, and `publicationYear`.
- `Author`: Contains fields like `id`, `name`, and `biography`.
- `Rental`: Represents a book rental, with fields `id`, `bookId`, `renterName`, `rentalDate`, and `returnDate`.
2. RESTful Endpoints:
- CRUD operations for `Book`.
- CRUD operations for `Author`.
- Create and retrieve `Rental` records.
- Endpoints to retrieve books by author, books available for rent, and books currently rented.
3. Business Logic:
- When renting a book, ensure the book is not already rented.
- When returning a book, mark it as available.
- Implement a method to check for overdue rentals (rental periods exceeding a set time, e.g., 14 days).
4. Testing:
- Write basic unit tests to verify core business logic and RESTful endpoints.
- Consider integration tests to ensure endpoints work as expected with the database.
5. Error Handling and Validation:
- Implement proper error handling for invalid requests.
- Validate inputs to ensure required fields are provided, and values are in the correct format (e.g., ISBN, dates).
6. Documentation:
- Provide a README file with setup instructions, how to run the application, and sample requests to test the endpoints.
- Include any additional documentation explaining design decisions or assumptions made during development.

### Tech:

Spring Boot, Any Database

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