First Commit JPA Entities.

src/main/java/guru/springframework/spring5webapp/Bootstrap/BootStrapData.java

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+package guru.springframework.spring5webapp.Bootstrap;
+
+public class BootStrapData {
+}

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

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+package guru.springframework.spring5webapp.domain;
+
+
+import javax.persistence.*;
+
+import java.util.Set;
+
+@Entity
+public class Author {
+
+    @Id
+    @GeneratedValue(strategy =  GenerationType.AUTO)
+    public long id;
+
+    private String firstName;
+    private String lastName;
+    @ManyToMany
+    private Set<Books> books;
+
+    public Author() {
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public Author(String firstName, String lastName, Set<Books> books) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.books = books;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public Set<Books> getBooks() {
+        return books;
+    }
+
+    public void setBooks(Set<Books> books) {
+        this.books = books;
+    }
+
+    @Override
+    public String toString() {
+        return "Author{" +
+                "id=" + id +
+                ", firstName='" + firstName + '\'' +
+                ", lastName='" + lastName + '\'' +
+                ", books=" + books +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Author author = (Author) o;
+
+        return id == author.id;
+    }
+
+    @Override
+    public int hashCode() {
+        return (int) (id ^ (id >>> 32));
+    }
+}

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

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+package guru.springframework.spring5webapp.domain;
+
+import javax.persistence.*;
+import java.util.Set;
+
+@Entity
+public class Books {
+    @Id
+    @GeneratedValue(strategy =  GenerationType.AUTO)
+    private Long id;
+
+    private String title;
+    private String isbn;
+
+    @ManyToMany
+    @JoinTable(name = "author_book", joinColumns = @JoinColumn(name = "books_id"),
+            inverseJoinColumns = @JoinColumn(name = "author_id"))
+    private Set<Author> authors;
+
+
+    public Books() {
+    }
+
+    public Books(String title, String isbn, Set<Author> authors) {
+        this.title = title;
+        this.isbn = isbn;
+        this.authors = authors;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Set<Author> getAuthors() {
+        return authors;
+    }
+
+    public void setAuthors(Set<Author> authors) {
+        this.authors = authors;
+    }
+
+    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;
+    }
+
+    @Override
+    public String toString() {
+        return "Books{" +
+                "id=" + id +
+                ", title='" + title + '\'' +
+                ", isbn='" + isbn + '\'' +
+                ", authors=" + authors +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Books books = (Books) o;
+
+        return id != null ? id.equals(books.id) : books.id == null;
+    }
+
+    @Override
+    public int hashCode() {
+        return id != null ? id.hashCode() : 0;
+    }
+}

src/main/java/repositories/AuthorRepository.java

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+package repositories;
+
+import guru.springframework.spring5webapp.domain.Author;
+import org.springframework.data.repository.CrudRepository;
+
+public interface AuthorRepository extends CrudRepository<Author, Long> {
+}

src/main/java/repositories/BookRepository.java

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+package repositories;
+
+import guru.springframework.spring5webapp.domain.Books;
+import org.springframework.data.repository.CrudRepository;
+
+public interface BookRepository  extends CrudRepository<Books, Long> {
+}