How to set @Autowired constructor params as "required=false" individually

Question

I'm using the @Autowired annotation under a @Configuration class constructor.

@Configuration public class MyConfiguration {     private MyServiceA myServiceA;    private MyServiceB myServiceB     @Autowired    public MyConfiguration(MyServiceA myServiceA, MyServiceB myServiceB){      this.myServiceA = myServiceA;      this.myServiceB = myServiceB;        } } 

As the Spring documentation sais, I'm able to declare whether the annotated dependency is required.

If I mark the @Autowired annotation under the constructor as required=false, I'm saying that the two services to be autowired are not required (as the Spring documentation says):

@Autowired(required = false) public MyConfiguration(MyServiceA myServiceA, MyServiceB myServiceB){   this.myServiceA = myServiceA;   this.myServiceB = myServiceB;    } 

From Spring documentation:

In the case of multiple argument methods, the 'required' parameter is applicable for all arguments.

How can I set the required attribute to each constructor parameter individually? Is necessary to use @Autowired annotation under every field?

Regards,

Answer 1

If you're using Java 8 and Spring Framework 4, you can use Optional.

@Autowired public MyConfiguration(Optional<MyServiceA> myServiceA, Optional<MyServiceB> myServiceB){   myServiceA.ifPresent(service->{this.myServiceA = service});   myServiceB.ifPresent(service->{this.myServiceB = service});    }