问题
I am currently going through Mkyong Spring 3.0 tutorial.
He goes on to clarify these 2 basic things.
1. Bean in different XML files
If you are referring to a bean in different XML file, you can reference it with a ‘ref‘ tag, ‘bean‘ attribute.
2. Bean in same XML file
If you are referring to a bean in same XML file, you can reference it with ‘ref‘ tag, ‘local‘ attribute.
The only thing I can make out is that the local attribute is not supported any more in version 4.1.5. For the timebeing, I have sticked to the
<ref bean="thebeaninstance"/>
and it works for both. <ref bean="..."> requires only it to be in the same context, or in a parent context.
But i am looking for something by which i will be able to resolve the difference once if somehow i encounter same ids in 2 different beans, and wish to refer to the one defined in different XML, since preference goes to the one defines in the same XML. Please suggest.
回答1:
Spring dropped support for the local ref elements in version 4.0.1. This is from the notes:
Removed the ref 'local' attribute in spring-beans-4.0.xsd since 'local' lost its differentiating role to a regular bean ref back in the 3.1 days when we started allowing for the same bean id to reappear in a different beans section of the same configuration file (with a different profile). Issue: SPR-10437
See here: link
Basically, you should use the bean element.
来源：https://stackoverflow.com/questions/29049183/attribute-local-is-not-allowed-to-appear-in-element-ref-in-spring-4-1-5