I am trying to understand the javax.inject package and I am not clear what the javax.inject.Named annotation is supposed to be used for. The Javadoc does not explain the the idea behind it.
Javadoc is at http://download.oracle.com/javaee/6/api/javax/inject/Named.html
I am using Spring 3.0 to write some sample programs, by putting @Named on a bean it seems to add it to the bean factory but the Javadoc description is so light I can't tell if that is the standard behavior or Spring specific behavior.
My questions are:
@Named and @Qualifier@Component in Spring?Update 1 there is an excellent explanation of @Named and @Qualifier at Nice article about @Named and @Qualifier https://dzone.com/articles/java-ee6-cdi-named-components thanks @xmedeko for linking to it the comment below.
This question is related to
java
spring
dependency-injection
java-ee-6
Regarding #2, according to the JSR-330 spec:
This package provides dependency injection annotations that enable portable classes, but it leaves external dependency configuration up to the injector implementation.
So it's up to the provider to determine which objects are available for injection. In the case of Spring it is all Spring beans. And any class annotated with JSR-330 annotations are automatically added as Spring beans when using an AnnotationConfigApplicationContext.
@Inject instead of Spring’s @Autowired to inject a bean.
@Named instead of Spring’s @Component to declare a bean.
Those JSR-330 standard annotations are scanned and retrieved the same way as Spring annotation (as long as the following jar is in your classpath)
The primary role of the @Named annotation is to define a bean for the purpose of resolving EL statements within the application, usually through JSF EL resolvers. Injection can be performed using names but this was not how injection in CDI was meant to work since CDI gives us a much richer way to express injection points and the beans to be injected into them.
Source: Stackoverflow.com