This version is still in development and is not considered stable yet. For the latest stable version, please use Spring Framework 6.1.12! |
Annotation-based Container Configuration
Spring provides comprehensive support for annotation-based configuration, operating on
metadata in the component class itself by using annotations on the relevant class,
method, or field declaration. As mentioned in
Example: The AutowiredAnnotationBeanPostProcessor
,
Spring uses BeanPostProcessors
in conjunction with annotations to make the core IOC
container aware of specific annotations.
For example, the @Autowired
annotation provides the same capabilities as described in
Autowiring Collaborators but
with more fine-grained control and wider applicability. In addition, Spring provides
support for JSR-250 annotations, such as @PostConstruct
and @PreDestroy
, as well as
support for JSR-330 (Dependency Injection for Java) annotations contained in the
jakarta.inject
package such as @Inject
and @Named
. Details about those annotations
can be found in the relevant section.
Annotation injection is performed before external property injection. Thus, external configuration (e.g. XML-specified bean properties) effectively overrides the annotations for properties when wired through mixed approaches. |
Technically, you can register the post-processors as individual bean definitions, but they
are implicitly registered in an AnnotationConfigApplicationContext
already.
In an XML-based Spring setup, you may include the following configuration tag to enable mixing and matching with annotation-based configuration:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
https://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd">
<context:annotation-config/>
</beans>
The <context:annotation-config/>
element implicitly registers the following post-processors:
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