Spring 5 Design Patterns

Using constructor injection

For the DI pattern with the construction injection, Spring provides you two basic options as the <constructor-arg> element and c-namespace introduced in Spring 3.0. c-namespace has less verbosity in the application, which is the only difference between them--you can choose any one. Let's inject the collaborating beans with the construction injection as follows:

    <bean id="transferService"        class="com.packt.patterninspring.chapter4.     bankapp.service.TransferServiceImpl"> 
     <constructor-arg ref="accountRepository"/> 
     <constructor-arg ref="transferRepository"/> 
    </bean>     <bean id="accountRepository"         class="com.packt.patterninspring.chapter4.     bankapp.repository.jdbc.JdbcAccountRepository"/>  <bean id="transferRepository" ...