Spring Autowiring only works with Interface

Question

I am quite new to spring framework and came across the following issue.

I have an interface ClassA, which is implemented by classed ClassA1

Answer 1

I have similar problem with Autowiring abstract service. You can use without any problem code like this:

@Autowired
@Qualifier("classA1")
private ClassA1 classA1;

@Autowired
@Qualifier("classA2")
private ClassA2 classA2;

This will be working only if you declare your bean like this

Or like this

@Component("classA1")
public class ClassA1 {
...
}