[Spring] What is Beans lifecycle?

Bean Lifecycle 그림으로 보기

Bean Lifecycle Methods / Hooks

• You can add custom code during bean initialization
  • Calling custom business logic methods
  • Setting up handles to resources(db,sockets,file etc)
• You can add custom code during bean destruction
  • Calling custom business logic method
  • Clean up handles to resources(db,sockets,files etc)

Init: method configuration

@Component  
public class CricketCoach implements Coach{  
    public CricketCoach(){  
        System.out.println("In constructor: " + getClass().getSimpleName() );  
    }  
  
    // define our init method  
    @PostConstruct  
    public void doMyStartupStuff(){  
        System.out.println("In doMyStartupStuff(): " + getClass().getSimpleName());  
    }
.....

Destroy: method configuration

  
@Component  
public class CricketCoach implements Coach{  
    public CricketCoach(){  
        System.out.println("In constructor: " + getClass().getSimpleName() );  
    }  
  
    // define our init method  
    @PostConstruct  
    public void doMyStartupStuff(){  
        System.out.println("In doMyStartupStuff(): " + getClass().getSimpleName());  
    }  
  
    // define our destroy method  
    @PreDestroy  
    public void doMyCleanupStuff(){  
        System.out.println("In doMyCleanupStuff(): " + getClass().getSimpleName());  
    }

Development Process

1. Define your methods for init and destroy
2. Add annotaions: @PostConstruct and @PreDestroy