diff --git a/pom.xml b/pom.xml
index f34c1936df..31af7e8176 100644
--- a/pom.xml
+++ b/pom.xml
@@ -42,6 +42,7 @@
 			<artifactId>spring-boot-starter-web</artifactId>
 		</dependency>
 
+
 		<dependency>
 			<groupId>com.h2database</groupId>
 			<artifactId>h2</artifactId>
diff --git a/src/main/java/guru/springframework/spring5webapp/bootstrap/BootStrapData.java b/src/main/java/guru/springframework/spring5webapp/bootstrap/BootStrapData.java
new file mode 100644
index 0000000000..adaee0e84f
--- /dev/null
+++ b/src/main/java/guru/springframework/spring5webapp/bootstrap/BootStrapData.java
@@ -0,0 +1,70 @@
+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 BootStrapData implements CommandLineRunner {
+
+    private final AuthorRepository authorRepository;
+    private final BookRepository bookRepository;
+    private final PublisherRepository publisherRepository;
+
+    public BootStrapData(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 a Bootstrap");
+        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());
+
+        Author eric= new Author("Eric","Evans");
+        Book ddd= new Book("Domain driven design","12345");
+        eric.getBooks().add(ddd);
+        ddd.getAuthors().add(eric);
+
+        //miután beállítottuk a Book és a PUblisher közötti sok-egy kapcsolatot, és Joincolumnot is beállítottuk
+        ddd.setPublisher(publisher);
+        publisher.getBooks().add(ddd);
+
+
+        authorRepository.save(eric);
+        bookRepository.save(ddd);
+        publisherRepository.save(publisher);
+
+
+        Author lewis= new Author("C.S","Lewis");
+        Book sbj= new Book("Suprised by joy","12347");
+        lewis.getBooks().add(sbj);
+        sbj.getAuthors().add(lewis);
+
+        sbj.setPublisher(publisher);
+        publisher.getBooks().add(sbj);
+
+// fontos a mentési sorrend ha 'publisherRepository.save(publisher);' feljebb van nem működik
+        authorRepository.save(lewis);
+        bookRepository.save(sbj);
+        publisherRepository.save(publisher);
+
+
+        System.out.println("Number of books:"+bookRepository.count());
+        System.out.println("Publisher Number of books: "+publisher.getBooks().size());
+    }
+}
diff --git a/src/main/java/guru/springframework/spring5webapp/controllers/BookController.java b/src/main/java/guru/springframework/spring5webapp/controllers/BookController.java
new file mode 100644
index 0000000000..a6ba582585
--- /dev/null
+++ b/src/main/java/guru/springframework/spring5webapp/controllers/BookController.java
@@ -0,0 +1,29 @@
+package guru.springframework.spring5webapp.controllers;
+
+// Spring MVC 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";
+  }
+
+
+}
diff --git a/src/main/java/guru/springframework/spring5webapp/domain/Author.java b/src/main/java/guru/springframework/spring5webapp/domain/Author.java
new file mode 100644
index 0000000000..e8b771b15a
--- /dev/null
+++ b/src/main/java/guru/springframework/spring5webapp/domain/Author.java
@@ -0,0 +1,83 @@
+package guru.springframework.spring5webapp.domain;
+
+
+import javax.persistence.*;
+import java.util.HashSet;
+import java.util.Set;
+@Entity
+public class Author {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO) //automatikus id generálás (mint az adatb-ban)
+    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;
+    }
+
+    @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 != null ? id.equals(author.id) : author.id == null;
+    }
+
+    @Override
+    public int hashCode() {
+        return id != null ? id.hashCode() : 0;
+    }
+}
diff --git a/src/main/java/guru/springframework/spring5webapp/domain/Book.java b/src/main/java/guru/springframework/spring5webapp/domain/Book.java
new file mode 100644
index 0000000000..24855283a4
--- /dev/null
+++ b/src/main/java/guru/springframework/spring5webapp/domain/Book.java
@@ -0,0 +1,98 @@
+package guru.springframework.spring5webapp.domain;
+
+import javax.persistence.*;
+
+import java.util.HashSet;
+import java.util.Set;
+
+@Entity
+public class Book {
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    private String title;
+    private  String isbn;
+    @ManyToOne // sok könyv lehet, de egy könyvhöz csak egy kiadó tartozik
+    private Publisher publisher;
+
+    @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 + '\'' +
+                ", authors=" + authors +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Book book = (Book) o;
+
+        return id != null ? id.equals(book.id) : book.id == null;
+    }
+
+    @Override
+    public int hashCode() {
+        return id != null ? id.hashCode() : 0;
+    }
+}
diff --git a/src/main/java/guru/springframework/spring5webapp/domain/Publisher.java b/src/main/java/guru/springframework/spring5webapp/domain/Publisher.java
new file mode 100644
index 0000000000..c9c7313e53
--- /dev/null
+++ b/src/main/java/guru/springframework/spring5webapp/domain/Publisher.java
@@ -0,0 +1,113 @@
+package guru.springframework.spring5webapp.domain;
+
+import javax.persistence.*;
+import java.util.HashSet;
+import java.util.Set;
+
+// POJO and annotating it as a JPA entitity
+@Entity
+
+public class Publisher {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private Long id;
+
+    private String name;
+    private String addressLine1;
+    private String city;
+    private String state;
+    private String zip;
+
+
+    @OneToMany // = publisher is one, and it has many books
+    @JoinColumn(name = "publisher_id")
+    //mivel egy könyvnek csak 1 kiadója lehet, viszont a kiadónak sok könyve, ezért beállítjuk a egy többhöz kapcsolatot
+    private Set<Book> books = new HashSet<>();
+
+    public Publisher() {
+    }
+
+    public Set<Book> getBooks() {
+        return books;
+    }
+
+    public void setBooks(Set<Book> books) {
+        this.books = books;
+    }
+
+    @Override
+    public String toString() {
+        return "Publisher{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", addressLine1='" + addressLine1 + '\'' +
+                ", city='" + city + '\'' +
+                ", state='" + state + '\'' +
+                ", zip='" + zip + '\'' +
+                '}';
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getAddressLine1() {
+        return addressLine1;
+    }
+
+    public void setAddressLine1(String addressLine1) {
+        this.addressLine1 = addressLine1;
+    }
+
+    public String getCity() {
+        return city;
+    }
+
+    public void setCity(String city) {
+        this.city = city;
+    }
+
+    public String getState() {
+        return state;
+    }
+
+    public void setState(String state) {
+        this.state = state;
+    }
+
+    public String getZip() {
+        return zip;
+    }
+
+    public void setZip(String zip) {
+        this.zip = zip;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Publisher publisher = (Publisher) o;
+
+        return id != null ? id.equals(publisher.id) : publisher.id == null;
+    }
+
+    @Override
+    public int hashCode() {
+        return id != null ? id.hashCode() : 0;
+    }
+}
diff --git a/src/main/java/guru/springframework/spring5webapp/repositories/AuthorRepository.java b/src/main/java/guru/springframework/spring5webapp/repositories/AuthorRepository.java
new file mode 100644
index 0000000000..7722821305
--- /dev/null
+++ b/src/main/java/guru/springframework/spring5webapp/repositories/AuthorRepository.java
@@ -0,0 +1,9 @@
+package guru.springframework.spring5webapp.repositories;
+
+import guru.springframework.spring5webapp.domain.Author;
+import org.springframework.data.repository.CrudRepository;
+
+public interface AuthorRepository extends CrudRepository<Author,Long> {
+
+
+}
diff --git a/src/main/java/guru/springframework/spring5webapp/repositories/BookRepository.java b/src/main/java/guru/springframework/spring5webapp/repositories/BookRepository.java
new file mode 100644
index 0000000000..888eb68add
--- /dev/null
+++ b/src/main/java/guru/springframework/spring5webapp/repositories/BookRepository.java
@@ -0,0 +1,7 @@
+package guru.springframework.spring5webapp.repositories;
+
+import guru.springframework.spring5webapp.domain.Book;
+import org.springframework.data.repository.CrudRepository;
+
+public interface BookRepository extends CrudRepository<Book,Long> {
+}
diff --git a/src/main/java/guru/springframework/spring5webapp/repositories/PublisherRepository.java b/src/main/java/guru/springframework/spring5webapp/repositories/PublisherRepository.java
new file mode 100644
index 0000000000..f923af1e04
--- /dev/null
+++ b/src/main/java/guru/springframework/spring5webapp/repositories/PublisherRepository.java
@@ -0,0 +1,8 @@
+package guru.springframework.spring5webapp.repositories;
+
+import guru.springframework.spring5webapp.domain.Publisher;
+import org.springframework.data.repository.CrudRepository;
+
+public interface PublisherRepository extends CrudRepository<Publisher,Long> {
+
+}
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
index e69de29bb2..8b13789179 100644
--- a/src/main/resources/application.properties
+++ b/src/main/resources/application.properties
@@ -0,0 +1 @@
+