BootStrap.java

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);

        authorRepository.save(eric);
        bookRepository.save(ddd);

        Author rod = new Author("Rod", "Johnson");
        Book noEJB = new Book("J2EE Development without EJ8", "39394546");
        rod.getBooks().add(noEJB);
        noEJB.getAuthors().add(rod);

        authorRepository.save(rod);
        bookRepository.save(noEJB);

        System.out.println("Number of Books: " + bookRepository.count());

    }
}