diff --git a/src/main/java/com/epam/izh/rd/online/entity/Author.java b/src/main/java/com/epam/izh/rd/online/entity/Author.java
index 166be587..68ac7f79 100644
--- a/src/main/java/com/epam/izh/rd/online/entity/Author.java
+++ b/src/main/java/com/epam/izh/rd/online/entity/Author.java
@@ -19,5 +19,76 @@
  * 6) Переопределить метод toString с выводом всех полей (не забывайте alt+inset)
  */
 public class Author {
+    private String name;
+    private String lastName;
+    private LocalDate birthdate;
+    private String country;
 
+    public Author() {
+    }
+
+    public Author(String name, String lastName, LocalDate birthdate, String country) {
+        this.name = name;
+        this.lastName = lastName;
+        this.birthdate = birthdate;
+        this.country = country;
+    }
+
+    @Override
+    public String toString() {
+        return "Author{" +
+                "name='" + name + '\'' +
+                ", lastName='" + lastName + '\'' +
+                ", birthdate=" + birthdate +
+                ", country='" + country + '\'' +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Author author = (Author) o;
+        return name.equals(author.name) &&
+                lastName.equals(author.lastName) &&
+                birthdate.equals(author.birthdate) &&
+                country.equals(author.country);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name, lastName, birthdate, country);
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public LocalDate getBirthdate() {
+        return birthdate;
+    }
+
+    public void setBirthdate(LocalDate birthdate) {
+        this.birthdate = birthdate;
+    }
+
+    public String getCountry() {
+        return country;
+    }
+
+    public void setCountry(String country) {
+        this.country = country;
+    }
 }
diff --git a/src/main/java/com/epam/izh/rd/online/entity/Book.java b/src/main/java/com/epam/izh/rd/online/entity/Book.java
index 08bdccb8..838696b6 100644
--- a/src/main/java/com/epam/izh/rd/online/entity/Book.java
+++ b/src/main/java/com/epam/izh/rd/online/entity/Book.java
@@ -16,5 +16,52 @@
  * 6) Переопределить метод toString с выводом всех полей (не забывайте alt+inset)
  */
 public abstract class Book {
+    private int numberOfPages;
+    private String name;
 
+    public Book() {
+    }
+
+    public Book(int numberOfPages, String name) {
+        this.numberOfPages = numberOfPages;
+        this.name = name;
+    }
+
+    @Override
+    public String toString() {
+        return "Book{" +
+                "numberOfPages=" + numberOfPages +
+                ", name='" + name + '\'' +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Book book = (Book) o;
+        return numberOfPages == book.numberOfPages &&
+                name.equals(book.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(numberOfPages, name);
+    }
+
+    public int getNumberOfPages() {
+        return numberOfPages;
+    }
+
+    public void setNumberOfPages(int numberOfPages) {
+        this.numberOfPages = numberOfPages;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
 }
diff --git a/src/main/java/com/epam/izh/rd/online/entity/SchoolBook.java b/src/main/java/com/epam/izh/rd/online/entity/SchoolBook.java
index a9834db4..0c9570ee 100644
--- a/src/main/java/com/epam/izh/rd/online/entity/SchoolBook.java
+++ b/src/main/java/com/epam/izh/rd/online/entity/SchoolBook.java
@@ -20,5 +20,72 @@
  * 6) Переопределить метод toString с выводом всех полей (не забывайте alt+inset)
  */
 public class SchoolBook extends Book {
+    private String authorName;
+    private String authorLastName;
+    private LocalDate publishDate;
 
+    public SchoolBook() {
+    }
+
+    public SchoolBook(String authorName, String authorLastName, LocalDate publishDate) {
+        this.authorName = authorName;
+        this.authorLastName = authorLastName;
+        this.publishDate = publishDate;
+    }
+
+    public SchoolBook(int numberOfPages, String name, String authorName, String authorLastName, LocalDate publishDate) {
+        super(numberOfPages, name);
+        this.authorName = authorName;
+        this.authorLastName = authorLastName;
+        this.publishDate = publishDate;
+    }
+
+    @Override
+    public String toString() {
+        return "SchoolBook{" +
+                "authorName='" + authorName + '\'' +
+                ", authorLastName='" + authorLastName + '\'' +
+                ", publishData=" + publishDate +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        if (!super.equals(o)) return false;
+        SchoolBook that = (SchoolBook) o;
+        return Objects.equals(authorName, that.authorName) &&
+                Objects.equals(authorLastName, that.authorLastName) &&
+                Objects.equals(publishDate, that.publishDate);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(super.hashCode(), authorName, authorLastName, publishDate);
+    }
+
+    public String getAuthorName() {
+        return authorName;
+    }
+
+    public void setAuthorName(String authorName) {
+        this.authorName = authorName;
+    }
+
+    public String getAuthorLastName() {
+        return authorLastName;
+    }
+
+    public void setAuthorLastName(String authorLastName) {
+        this.authorLastName = authorLastName;
+    }
+
+    public LocalDate getPublishDate() {
+        return publishDate;
+    }
+
+    public void setPublishDate(LocalDate publishDate) {
+        this.publishDate = publishDate;
+    }
 }
diff --git a/src/main/java/com/epam/izh/rd/online/repository/SimpleAuthorRepository.java b/src/main/java/com/epam/izh/rd/online/repository/SimpleAuthorRepository.java
new file mode 100644
index 00000000..e77e84eb
--- /dev/null
+++ b/src/main/java/com/epam/izh/rd/online/repository/SimpleAuthorRepository.java
@@ -0,0 +1,55 @@
+package com.epam.izh.rd.online.repository;
+
+import com.epam.izh.rd.online.entity.Author;
+
+import java.util.Arrays;
+
+public class SimpleAuthorRepository implements AuthorRepository {
+    private Author[] authors = new Author[0];
+
+    @Override
+    public boolean save(Author author) {
+        if (!isAuthorNotExist(author)) {
+            return false;
+        }
+
+        Author[] resultArr = Arrays.copyOf(authors, authors.length + 1);
+        resultArr[resultArr.length - 1] = author;
+        authors = resultArr;
+
+        return true;
+    }
+
+    @Override
+    public Author findByFullName(String name, String lastname) {
+        for (Author author : authors) {
+            if (author.getName().equals(name) &&
+                    author.getLastName().equals(lastname)) {
+                return author;
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public boolean remove(Author author) {
+        if (isAuthorNotExist(author)) {
+            return false;
+        }
+
+        Author[] tempArr = Arrays.stream(authors).filter(theAuthor ->
+                !theAuthor.getName().equals(author.getName())
+                        || !theAuthor.getLastName().equals(author.getLastName())).toArray(Author[]::new);
+        authors = tempArr;
+        return true;
+    }
+
+    @Override
+    public int count() {
+        return authors.length;
+    }
+
+    private boolean isAuthorNotExist(Author author) {
+        return findByFullName(author.getName(), author.getLastName()) == null;
+    }
+}
diff --git a/src/main/java/com/epam/izh/rd/online/repository/SimpleSchoolBookRepository.java b/src/main/java/com/epam/izh/rd/online/repository/SimpleSchoolBookRepository.java
new file mode 100644
index 00000000..713733e0
--- /dev/null
+++ b/src/main/java/com/epam/izh/rd/online/repository/SimpleSchoolBookRepository.java
@@ -0,0 +1,43 @@
+package com.epam.izh.rd.online.repository;
+
+import com.epam.izh.rd.online.entity.SchoolBook;
+
+import java.util.Arrays;
+
+public class SimpleSchoolBookRepository implements BookRepository<SchoolBook> {
+    private SchoolBook[] schoolBooks = new SchoolBook[0];
+
+    @Override
+    public boolean save(SchoolBook book) {
+        SchoolBook[] resultArr = Arrays.copyOf(schoolBooks, schoolBooks.length + 1);
+        resultArr[resultArr.length - 1] = book;
+        schoolBooks = resultArr;
+        return true;
+    }
+
+    @Override
+    public SchoolBook[] findByName(String name) {
+        return Arrays.stream(schoolBooks).filter(theSchoolBook ->
+                theSchoolBook.getName().equals(name))
+                .toArray(SchoolBook[]::new);
+    }
+
+    @Override
+    public boolean removeByName(String name) {
+        if (findByName(name).length == 0) {
+            return false;
+        }
+
+        SchoolBook[] tempArr = Arrays.stream(schoolBooks)
+                .filter(book -> !book.getName().equals(name))
+                .toArray(SchoolBook[]::new);
+        schoolBooks = tempArr;
+
+        return true;
+    }
+
+    @Override
+    public int count() {
+        return schoolBooks.length;
+    }
+}
diff --git a/src/main/java/com/epam/izh/rd/online/service/SimpleAuthorService.java b/src/main/java/com/epam/izh/rd/online/service/SimpleAuthorService.java
new file mode 100644
index 00000000..bd885470
--- /dev/null
+++ b/src/main/java/com/epam/izh/rd/online/service/SimpleAuthorService.java
@@ -0,0 +1,35 @@
+package com.epam.izh.rd.online.service;
+
+import com.epam.izh.rd.online.entity.Author;
+import com.epam.izh.rd.online.repository.AuthorRepository;
+
+public class SimpleAuthorService implements AuthorService {
+    private AuthorRepository authorRepository;
+
+    public SimpleAuthorService() {
+    }
+
+    public SimpleAuthorService(AuthorRepository authorRepository) {
+        this.authorRepository = authorRepository;
+    }
+
+    @Override
+    public boolean save(Author author) {
+        return authorRepository.save(author);
+    }
+
+    @Override
+    public Author findByFullName(String name, String lastname) {
+        return authorRepository.findByFullName(name, lastname);
+    }
+
+    @Override
+    public boolean remove(Author author) {
+        return authorRepository.remove(author);
+    }
+
+    @Override
+    public int count() {
+        return authorRepository.count();
+    }
+}
diff --git a/src/main/java/com/epam/izh/rd/online/service/SimpleSchoolBookService.java b/src/main/java/com/epam/izh/rd/online/service/SimpleSchoolBookService.java
new file mode 100644
index 00000000..53d7b9ed
--- /dev/null
+++ b/src/main/java/com/epam/izh/rd/online/service/SimpleSchoolBookService.java
@@ -0,0 +1,61 @@
+package com.epam.izh.rd.online.service;
+
+import com.epam.izh.rd.online.entity.Author;
+import com.epam.izh.rd.online.entity.SchoolBook;
+import com.epam.izh.rd.online.repository.BookRepository;
+
+public class SimpleSchoolBookService implements BookService<SchoolBook> {
+    private BookRepository<SchoolBook> schoolBookBookRepository;
+    private AuthorService authorService;
+
+    public SimpleSchoolBookService() {
+    }
+
+    public SimpleSchoolBookService(BookRepository<SchoolBook> schoolBookBookRepository, AuthorService authorService) {
+        this.schoolBookBookRepository = schoolBookBookRepository;
+        this.authorService = authorService;
+    }
+
+    @Override
+    public boolean save(SchoolBook book) {
+        if (authorService.findByFullName(book.getAuthorName(), book.getAuthorLastName()) == null) {
+            return false;
+        }
+
+        schoolBookBookRepository.save(book);
+        return true;
+    }
+
+    @Override
+    public SchoolBook[] findByName(String name) {
+        return schoolBookBookRepository.findByName(name);
+    }
+
+    @Override
+    public int getNumberOfBooksByName(String name) {
+        return schoolBookBookRepository.findByName(name).length;
+    }
+
+    @Override
+    public boolean removeByName(String name) {
+        return schoolBookBookRepository.removeByName(name);
+    }
+
+    @Override
+    public int count() {
+        return schoolBookBookRepository.count();
+    }
+
+    @Override
+    public Author findAuthorByBookName(String name) {
+        if (schoolBookBookRepository.findByName(name).length == 0) {
+            return null;
+        }
+        SchoolBook book = schoolBookBookRepository.findByName(name)[0];
+
+        String authorName = book.getAuthorName();
+        String authorLastName = book.getAuthorLastName();
+
+        return authorService.findByFullName(authorName, authorLastName);
+    }
+}
diff --git a/src/test/java/com/epam/izh/rd/online/SchoolbookServiceTest.java b/src/test/java/com/epam/izh/rd/online/SchoolbookServiceTest.java
index 560023af..80ce0c86 100644
--- a/src/test/java/com/epam/izh/rd/online/SchoolbookServiceTest.java
+++ b/src/test/java/com/epam/izh/rd/online/SchoolbookServiceTest.java
@@ -6,7 +6,6 @@
 import com.epam.izh.rd.online.repository.BookRepository;
 import com.epam.izh.rd.online.service.AuthorService;
 import com.epam.izh.rd.online.service.BookService;
-import com.sun.deploy.util.ReflectionUtil;
 import org.apache.commons.lang3.StringUtils;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
@@ -72,11 +71,10 @@ void testConstructors(Class clazz, Class[] params) {
     @MethodSource("com.epam.izh.rd.online.Providers#testServiceAndRepositories")
     @DisplayName("Проверка наличия классов репозиториев, сервисов и их интерфейсов")
     void testClasses(String canonicalClassName, String interfaceName) {
-        boolean isClassAvailable = ReflectionUtil
-                .isClassAvailable(canonicalClassName, Thread.currentThread().getContextClassLoader());
+        boolean isClassAvailable = isClassAvailable(canonicalClassName, Thread.currentThread().getContextClassLoader());
         assertTrue(isClassAvailable, "Не найден класс " + canonicalClassName);
 
-        Class clazz = ReflectionUtil.getClass(canonicalClassName, Thread.currentThread().getContextClassLoader());
+        Class clazz = getClass(canonicalClassName, Thread.currentThread().getContextClassLoader());
         List<String> interfacesNames = Arrays.asList(clazz.getInterfaces()).stream().map(Class::getCanonicalName)
                 .collect(
                         Collectors.toList());
@@ -102,7 +100,7 @@ void testEqualsAndHash() {
     @Test
     @DisplayName("Проверка всей общей логики работы сервисов и репозиториев")
     void testLogic() {
-        Class clazz = ReflectionUtil.getClass("com.epam.izh.rd.online.repository.SimpleAuthorRepository",
+        Class clazz = getClass("com.epam.izh.rd.online.repository.SimpleAuthorRepository",
                 Thread.currentThread().getContextClassLoader());
         AuthorRepository authorRepository = null;
         try {
@@ -113,7 +111,7 @@ void testLogic() {
             fail("Сначала полностью реализуйте всю стрктуру приложения.");
         }
 
-        clazz = ReflectionUtil.getClass("com.epam.izh.rd.online.repository.SimpleSchoolBookRepository",
+        clazz = getClass("com.epam.izh.rd.online.repository.SimpleSchoolBookRepository",
                 Thread.currentThread().getContextClassLoader());
         BookRepository bookRepository = null;
         try {
@@ -124,7 +122,7 @@ void testLogic() {
             fail("Сначала полностью реализуйте всю стрктуру приложения.");
         }
 
-        clazz = ReflectionUtil.getClass("com.epam.izh.rd.online.service.SimpleAuthorService",
+        clazz = getClass("com.epam.izh.rd.online.service.SimpleAuthorService",
                 Thread.currentThread().getContextClassLoader());
         AuthorService authorService = null;
         try {
@@ -136,7 +134,7 @@ void testLogic() {
             fail("Сначала полностью реализуйте всю стрктуру приложения.");
         }
 
-        clazz = ReflectionUtil.getClass("com.epam.izh.rd.online.service.SimpleSchoolBookService",
+        clazz = getClass("com.epam.izh.rd.online.service.SimpleSchoolBookService",
                 Thread.currentThread().getContextClassLoader());
         BookService bookService = null;
         try {
@@ -266,8 +264,7 @@ void testLogic() {
     }
 
     private Author getNewInstanceOfAuthor(String name, String lastName, LocalDate birthdate, String country) {
-        Class clazz = ReflectionUtil
-                .getClass("com.epam.izh.rd.online.entity.Author", Thread.currentThread().getContextClassLoader());
+        Class clazz = getClass("com.epam.izh.rd.online.entity.Author", Thread.currentThread().getContextClassLoader());
         try {
             Author author = (Author) clazz.newInstance();
 
@@ -286,8 +283,8 @@ private Author getNewInstanceOfAuthor(String name, String lastName, LocalDate bi
 
     private SchoolBook getNewInstanceOfSchoolBook(int numberOfPages, String name, String authorName,
                                                   String authorLastName, LocalDate publishDate) {
-        Class clazz = ReflectionUtil
-                .getClass("com.epam.izh.rd.online.entity.SchoolBook", Thread.currentThread().getContextClassLoader());
+        Class clazz = getClass(
+            "com.epam.izh.rd.online.entity.SchoolBook", Thread.currentThread().getContextClassLoader());
         try {
             SchoolBook schoolBook = (SchoolBook) clazz.newInstance();
 
@@ -312,4 +309,22 @@ private void setValueToField(Class clazz, String fieldName, Object obj, Object v
         ReflectionUtils.setField(Objects.requireNonNull(ReflectionUtils.findField(clazz, fieldName)), obj, value);
     }
 
+
+    private static Class getClass(String name, ClassLoader classLoader) {
+        try {
+            return Class.forName(name, false, classLoader);
+        } catch (Throwable e) {
+            return null;
+        }
+    }
+
+    private static boolean isClassAvailable(String name, ClassLoader classLoader) {
+        try {
+            Class clazz = Class.forName(name, false, classLoader);
+            return clazz != null;
+        } catch (Throwable e) {
+            return false;
+        }
+    }
+
 }