Spring 5 Design Patterns

Injecting Spring beans

In the preceding code, I declared the beans TransferService, AccountRepository, and TransferRepository; these beans had no dependencies. But, actually, the TransferService bean depends on AccountRepository and TransferRepository. Let's see the following changes made in the AppConfig class to declare the beans:

    package com.packt.patterninspring.chapter4.bankapp.config; 
    import org.springframework.context.annotation.Bean; 
    import org.springframework.context.annotation.Configuration; 
    @Configuration 
    public class AppConfig { 
      @Bean 
      public TransferService transferService(){ 
        return new TransferServiceImpl(accountRepository(),  transferRepository()); } @Bean public AccountRepository accountRepository() { return new JdbcAccountRepository(); ...