Lab#SB00-1: Library UML

Spring Boot Library Management UML

Spring-Boot

lab

Spring Boot

Author

albertprofe

Published

Tuesday, June 1, 2021

Modified

Sunday, August 10, 2025

📘 Spring Boot Lab#SB00-1: Library UML We are going to evolve the current Java SE Libraryproject into a Spring Boot Library Management System with a H2 DB and web with Thymeleaf.

The resulting Spring Boot Project would be similar to the current Java SE LibraryProject, with the addition of the Spring Boot annotations and the H2 database configuration.

The classes would be annotated with the @Entity annotation to indicate that they are persistent entities, and the repositories would be annotated with the @Repository annotation.

The services would be annotated with the @Service annotation, and the controllers would be annotated with the @Controller annotation.

The Thymeleaf templates** would be created in the resources/templates folder** of the project.

1 From LibraryProject to LibraryManagement

1.1 Create a new Spring Boot project & H2 DB

Create a new Spring Boot project: The first step would be to create a new Spring Boot project in the preferred IDE or text editor.

Note

The project can be created using Spring Initializr, which will create the necessary file structure and dependencies.

Configure the H2 database: In the newly created project, configure the H2 database by adding:
- the H2 dependency in the pom.xml file,
- and also create a new application.properties file
- set the database properties such as:
  - the database URL,
  - username,
  - and password.

1.2 Model & Entities

Create a Book Entity: To represent a book in the library management system, create a Book @Entity

It could include attributes such as title, author, publisher, year, ISBN, and status. The status attribute will indicate whether the book is available, borrowed or reserved.

Create a User Entity: To represent a user in the system, create a User entity that includes attributes such as library card number, name, surname, nationality, birthdate, and borrowed books.
Create Author Entity: To represent an author in the system, create an Author entity that includes attributes such as deathdate, books, name, and surname.
Create Staff Entity: To represent staff members in the system, create a Staff entity that includes attributes such as staff ID, position, registered users, and library books.

1.3 Domains: @Controller, @Service and @Repository

Create Repositories: To access the data stored in the database, create repositories for each entity. The repositories will provide the methods to create, read, update, and delete the data.
Create Services: Create services that will implement the business logic of the system by calling the repository methods.

The services will provide the methods to search for books, borrow a book, return a book, add a book, remove a book, update book details, register a user, remove a user, update user details, and generate reports.

Create Controllers: Create controllers that will handle the HTTP requests from the web interface by calling the service methods.

The controllers will provide the methods to create a user account, search for books, borrow a book, return a book, add a book, remove a book, update book details, register a user, remove a user, update user details, and generate reports.

1.4 HTML Thymeleaf

1.4.1 Modern server-side Java template engine

1.4.2 Create Thymeleaf

Create Thymeleaf templates: To create the web interface of the system, create Thymeleaf templates for each of the controller methods. The templates will be used to display the data and also to handle the user input.

Note

Thymeleaf is a modern server-side Java template engine for both web and standalone environments.

Thymeleaf’s main goal is to bring elegant natural templates to your development workflow — HTML that can be correctly displayed in browsers and also work as static prototypes, allowing for stronger collaboration in development teams.

1.5 Test

Test the system: Test the system by running it and making sure that all the functionalities work as expected.

2 MockUp

2.1 Core use-case: borrowBook() and returnBook() with user and librarian

Mockup Web Library Management core use-case extended

3 Discussion Solving: UML

classDiagram

  class GeneralOperations {
    <<interface>>
    +createAccount(): void
    +searchBooks(query: String): void 
  }

  class UserOperations {
    <<interface>>
    +borrowBook(book: Book): void
    +returnBook(book: Book): void
    +checkBorrowedBooks(): void
  }

  class LibraryMember {
    <<abstract>>
    +id: String
    +address: String
    +phoneNumber: String
  }

  class Member {
    <<abstract>>
    +name: String
    +surname: String
    nationality: String
    +birthdate: Date
  }

  class StaffOperations {
    <<interface>>
    +addBook(book: Book): void
    +removeBook(book: Book): void
    +updateBookDetails(book: Book): void
    +registerUser(user: User): void
    +removeUser(user: User): void
    +updateUserDetails(user: User): void
    +generateReports(): void
  }

  class User {
    -libraryCardNumber: String
    -borrowedBooks: ArrayList<Book>
    +User()
  }

  class Author {
    -deathdate: Date
    -books: Book
    +author()
  }
  
  class Staff {
    -staffId: String
    -position: String
    -registeredUsers: ArrayList<User>
    -libraryBooks: ArrayList<Book>
    +Staff()
  }

  class Book {
    -title: String
    -author: Author
    -publisher: String
    -year: int
    -isbn: String
    -status: String
    +Book()
    +getStatus(): String
  }

  GeneralOperations <|.. LibraryMember
  UserOperations <|.. User
  LibraryMember <|.. User
  LibraryMember <|.. Staff
  Member <|.. Author
  Member <|.. LibraryMember
  StaffOperations <|.. Staff
  Auth

Within Spring Boot Project

classDiagram


class WebController {
    -bookService: BookService
    -userService: UserService
    +WebController()
    +home(model: Model): String
    +searchBooks(model: Model, query: String): String
    +register(model: Model): String
    +addUser(model: Model, user: User): String
    +borrow(model: Model, bookCopyId: String): String
    +returnBook(model: Model, bookCopyId: String): String
    +checkBorrowedBooks(model: Model): String
}

class BookService {
    -bookRepository: BookRepository
    -bookCopyRepository: BookCopyRepository
    -borrowRecordRepository: BorrowRecordRepository
    +BookService()
    +addBook(book: Book): void
    +removeBook(isbn: String): void
    +getBook(isbn: String): Book
    +searchBooks(query: String): List<Book>
    +getAvailableBookCopies(isbn: String): List<BookCopy>
    +getBorrowedBookCopies(user: User): List<BookCopy>
    +borrowBook(user: User, bookCopyId: String): void
    +returnBook(user: User, bookCopyId: String): void
}

class UserService {
    -userRepository: UserRepository
    -borrowRecordRepository: BorrowRecordRepository
    +UserService()
    +registerUser(user: User): void
    +removeUser(libraryCardNumber: String): void
    +updateUserDetails(user: User): void
    +getUser(libraryCardNumber: String): User
    +getBorrowedBooks(user: User): List<BookCopy>
    +getBorrowHistory(user: User): List<BorrowRecord>
}

WebController --> BookService
WebController --> UserService
BookService --> BookRepository
BookService --> BookCopyRepository
BookService --> BorrowRecordRepository
UserService --> UserRepository
UserService --> BorrowRecordRepository

Just the Controller and Service

classDiagram
class BookCopy {
    -id: String
    -status: String
    -book: Book
    +BookCopy(book: Book)
    +getStatus(): String
}

class BorrowRecord {
    -id: String
    -user: User
    -bookCopy: BookCopy
    -borrowDate: LocalDateTime
    -returnDate: LocalDateTime
    +BorrowRecord()
    +setReturnDate(returnDate: LocalDateTime): void
}
Book --> Author
Book --> BookCopy
BookCopy --> Book
BookCopy --> BorrowRecord
User --> BorrowRecord
User --> BookCopy
BorrowRecord --> User
BorrowRecord --> BookCopy