Autowiring two beans implementing same interface - how to set default bean to autowire?

Question

Background:

I have a Spring 2.5/Java/Tomcat application. There is the following bean, which is used throughout the application in many places

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Answer 1

The reason why @Resource(name = "{your child class name}") works but @Autowired sometimes don't work is because of the difference of their Matching sequence

Matching sequence of @Autowire
Type, Qualifier, Name

Matching sequence of @Resource
Name, Type, Qualifier

The more detail explanation can be found here:
Inject and Resource and Autowired annotations

In this case, different child class inherited from the parent class or interface confuses @Autowire, because they are from same type; As @Resource use Name as first matching priority , it works.