If I use Spring's @Autowired annotation on a member of a class, can I new up the class?

Question

I have a dependent class B of class A that I want injected into A .

And so I use the @Autowired annotation in class A . But class A itself I create using new keyword and I find that the reference to class B is null .

So if you are using Autowired , must Spring manage class A also?

I mean, is the null reference because I am using new and not letting Spring manage the whole thing?

Answer 1

Yes, the both classes need to be in the same context. Manage by Spring.

You can see an example here. http://www.mkyong.com/spring/spring-auto-wiring-beans-with-autowired-annotation/

Answer 2

是的，Spring容器应该管理A类和B类的对象，以便能够将B引用注入A.