Ajb publisher relationships

src/main/java/guru/springframework/spring5webapp/bootstrap/BootStrap.java

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+package guru.springframework.spring5webapp.bootstrap;
+
+import guru.springframework.spring5webapp.domain.Author;
+import guru.springframework.spring5webapp.domain.Book;
+import guru.springframework.spring5webapp.domain.Publisher;
+import guru.springframework.spring5webapp.repositories.AuthorRepository;
+import guru.springframework.spring5webapp.repositories.BookRepository;
+import guru.springframework.spring5webapp.repositories.PublisherRepository;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Component;
+
+@Component
+public class BootStrap implements CommandLineRunner {
+
+    private final AuthorRepository authorRepository;
+    private final BookRepository bookRepository;
+    private final PublisherRepository publisherRepository;
+
+    // Constructor that tells Spring Framework we want instances injected into class using dependency injection
+    public BootStrap(AuthorRepository authorRepository, BookRepository bookRepository, PublisherRepository publisherRepository) {
+        this.authorRepository = authorRepository;
+        this.bookRepository = bookRepository;
+        this.publisherRepository = publisherRepository;
+    }
+
+    @Override
+    public void run(String... args) throws Exception {
+
+        System.out.println("Started in Bootstrap");
+
+        // Creating NEW publisher object
+        Publisher publisher = new Publisher();
+        publisher.setName("SFG Publishing");
+        publisher.setCity("St Petersburg");
+        publisher.setState("FL");
+
+        publisherRepository.save(publisher);
+
+        System.out.println("Publisher Count: " + publisherRepository.count());
+
+        // Creating new Author object
+        Author eric = new Author("Eric", "Evans");
+
+        // Creating new Book object
+        Book ddd = new Book("Domain Driven Design", "123123");
+
+        //adding book to Set in Author Class
+        eric.getBooks().add(ddd);
+        //adding author to Set in Book Class
+        ddd.getAuthors().add(eric);
+
+        ddd.setPublisher(publisher);
+        publisher.getBooks().add(ddd);
+
+        authorRepository.save(eric);
+        bookRepository.save(ddd);
+        publisherRepository.save(publisher);
+
+        Author rod = new Author("Rod", "Johnson");
+        Book noEJB = new Book("J2EE Development without EJ8", "39394546");
+        rod.getBooks().add(noEJB);
+        noEJB.getAuthors().add(rod);
+
+        noEJB.setPublisher(publisher);
+        publisher.getBooks().add(noEJB);
+
+        authorRepository.save(rod);
+        bookRepository.save(noEJB);
+        publisherRepository.save(publisher);
+
+        System.out.println("Number of Books: " + bookRepository.count());
+        System.out.println("Publisher Number of Books: " + publisher.getBooks().size());
+
+
+    }
+}

src/main/java/guru/springframework/spring5webapp/controllers/AuthorController.java

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+package guru.springframework.spring5webapp.controllers;
+
+import guru.springframework.spring5webapp.repositories.AuthorRepository;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@Controller
+public class AuthorController {
+
+    private final AuthorRepository authorRepository;
+
+    public AuthorController(AuthorRepository authorRepository) {
+        this.authorRepository = authorRepository;
+    }
+
+    @RequestMapping("/authors")
+    public String getAuthors(Model model){
+
+        model.addAttribute("authors", authorRepository.findAll());
+        return "authors/list";
+    }
+}

src/main/java/guru/springframework/spring5webapp/controllers/BookController.java

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+package guru.springframework.spring5webapp.controllers;
+
+import guru.springframework.spring5webapp.repositories.BookRepository;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@Controller
+public class BookController {
+
+    private final BookRepository bookRepository;
+
+    public BookController(BookRepository bookRepository) {
+        this.bookRepository = bookRepository;
+    }
+
+    @RequestMapping("/books")
+    public String getBooks(Model model){
+
+        model.addAttribute("books", bookRepository.findAll());
+        return "books/list";
+    }
+}

src/main/java/guru/springframework/spring5webapp/domain/Author.java

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+package guru.springframework.spring5webapp.domain;
+
+import javax.persistence.*;
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+
+@Entity
+public class Author {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+    private String firstName;
+    private String lastName;
+    @ManyToMany(mappedBy ="authors")
+    private Set<Book> books = new HashSet<>();
+
+    public Author() {
+    }
+
+    public Author(String firstName, String lastName) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public Set<Book> getBooks() {
+        return books;
+    }
+
+    public void setBooks(Set<Book> books) {
+        this.books = books;
+    }
+
+
+    // TO STRING FOR JSON TYPE DATA
+    @Override
+    public String toString() {
+        return "Author{" +
+                "id=" + id +
+                ", firstName='" + firstName + '\'' +
+                ", lastName='" + lastName + '\'' +
+
+                '}';
+    }
+
+    // SETTING UP THE EQUALS & HASHCODE FUNCTION
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Author author = (Author) o;
+
+        return Objects.equals(id, author.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return id != null ? id.hashCode() : 0;
+    }
+}

src/main/java/guru/springframework/spring5webapp/domain/Book.java

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+package guru.springframework.spring5webapp.domain;
+
+import javax.persistence.*;
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+
+@Entity
+public class Book {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    private String title;
+    private String isbn;
+    @ManyToOne
+    private Publisher publisher;
+
+    /*
+    Setting up the relationships between author and books
+    */
+    @ManyToMany
+    @JoinTable(name = "author_book", joinColumns = @JoinColumn(name = "book_id"),
+    inverseJoinColumns = @JoinColumn(name = "author_id"))
+    private Set<Author> authors = new HashSet<>();
+
+    public Book() {
+    }
+
+    public Book(String title, String isbn) {
+        this.title = title;
+        this.isbn = isbn;
+    }
+
+    public Publisher getPublisher() {
+        return publisher;
+    }
+
+    public void setPublisher(Publisher publisher) {
+        this.publisher = publisher;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getIsbn() {
+        return isbn;
+    }
+
+    public void setIsbn(String isbn) {
+        this.isbn = isbn;
+    }
+
+    public Set<Author> getAuthors() {
+        return authors;
+    }
+
+    public void setAuthors(Set<Author> authors) {
+        this.authors = authors;
+    }
+
+    @Override
+    public String toString() {
+        return "Book{" +
+                "id=" + id +
+                ", title='" + title + '\'' +
+                ", isbn='" + isbn + '\'' +
+
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Book book = (Book) o;
+
+        return Objects.equals(id, book.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return id != null ? id.hashCode() : 0;
+    }
+}