Question on Spring 3 autoscan and required annotation

I have a class annotated with spring Component e.g:

@Component
public class ImportantClass{

@Autowired
private DependentClassIF otherClass;

//getters setters

@Required 
public void setOtherClass(DependentClassIF c){
this.otherClass = c;    
}

public interface DependentClassIF {
    //methods here
}  
 @Component
 public class DependentClass implements DependentClassIF {
    //implementation here
 }

I use autoscan to detect beans instead of declaring them all in the bean conf file.

I get

org.springframework.beans.factory.BeanInitializationException: Property 'otherClass' is required for bean 'ImportantClass'

My quest开发者_如何学编程ion is the following: In autoscan, doesn't Spring make sure that all the required properties are injected?

If I remove the @Required it works, but I am not sure I understand Spring's behavior on this.

Any input is welcome.

Thanks

@Autowired has required set to true, so you don't need @Required

You don't need @Requried with annotation-based injection. It is meant to be used with xml configuration, to denote that a property must be set in the xml.