content: package com.bookstore;
  
  import com.bookstore.entity.Author;
  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("Avoid:\n------\n");
              Author authorRW = bookstoreService.fetchAuthorReadWriteMode();
              authorRW.setAge(authorRW.getAge() + 1);
              bookstoreService.updateAuthor(authorRW);
  
              System.out.println("\n\n=============================\n\n");
  
              System.out.println("Recommended:\n-----------\n");
              Author authorRO = bookstoreService.fetchAuthorReadOnlyMode();
              authorRO.setAge(authorRO.getAge() + 1);
              bookstoreService.updateAuthor(authorRO);
          };
      }
  }