content: package com.bookstore;
  
  import com.bookstore.service.BookstoreService;
  
  import org.springframework.boot.ApplicationRunner;
  import org.springframework.boot.SpringApplication;
  import org.springframework.boot.autoconfigure.SpringBootApplication;
  import org.springframework.context.annotation.Bean;
  
  @SpringBootApplication
  public class MainApplication {
      private final BookstoreService bookstoreService;
  
      public MainApplication(BookstoreService bookstoreService) {
          this.bookstoreService = bookstoreService;
      }
  
      public static void main(String[] args) {
          SpringApplication.run(MainApplication.class, args);
      }
  
      @Bean
      public ApplicationRunner init() {
          return args -> {
              System.out.println("\n\nPersist a new author:");
              bookstoreService.newAuthor();
  
              System.out.println("\n\nFind author by name:");
              bookstoreService.byName();
  
              System.out.println("\n\nFind author by the isbn of his book via a native query and cast:");
              bookstoreService.byBookIsbnNativeQueryCast();
  
              System.out.println("\n\nFind author by the isbn of his book via a native query:");
              bookstoreService.byBookIsbnNativeQuery();
          };
      }
  }