Autowire Annotation in Spring without using Component Scanning

Is it possible to autowire beans using th开发者_如何学Ce @Autowired annotation without using component scanning?

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Yes. <context-component-scan .. /> is responsible for discovering beans annotated with @Component, @Controller, @Service, @Respository, etc.

In order to have annotations processed (@Autowired, @Resource, etc) you need <context:annotation-config />. Thus annotations are processed on beans that are listed in applicationContext.xml.

As far as I know, <context-component-scan .. /> activates <context:annotation-config /> automatically.

This is true for both spring 2.5 and 3.0. (thanks skaffman)

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I have never tried without component-scanning enabled, however I can confirm that @Autowire annotations works in Spring 3.0.x even with beans that are defined via XML.

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When using AnnotationConfigApplicationContext, annotation config processors are always registered, meaning that any attempt to disable them at the @ComponentScan level would be ignored.

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If it is meant in the question that you should explicitly state:
- <context:component-scan ...> in your xml file(it enables <context:annotation-config />)
or
- @ComponentScan in your java config

Then the answer is - Yes, it is possible to enable component scanning without any of the stated above statements in your code or xml file.

Another approach is to use AnnotationConfigApplicationContext :

AnnotationConfigApplicationContext context= 
new AnnotationConfigApplicationContext("org.example.your.package");

Where "org.example.your.package" is your package for stereotyped annotated classes: @Component, @Repository, @Service, etc. AnnotationConfigApplicationContext will search for your beans in the base package and inner packages.

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No, we must use @ComponentScan if you are using java based configuration (or) <context-component-scan .. /> for xml based configuration.

Note: If you are not using any of the approaches no corresponding instances are created in AplicationContext.

and when you try to access a resource (http://localhost:8080/customers) will end up with

WARNING: No mapping found for HTTP request with URI [/customers] in DispatcherServlet with name 'dispatcher