@Resource is able to autodetect by type

[Izanami Caster]

Hello,

Based on what I've read on @Resource annotation, it's DI is by-Name. However, using a bean that's named differently from its setter method (Bean: resourceDependencyTwo vs Setter: resourceDependency) also worked.

Isn't this a contradiction ?

Please check the following:

<bean id="resourceDependent" class="com.earnest87.annotationconfig.jsr250.ResourceDependent"></bean> <bean id="resourceDependencyTwo" class="com.earnest87.annotationconfig.jsr250.ResourceDependency"> <property name="message" value="Chuck!"></property> </bean>


Dependent Resource:

import javax.annotation.Resource;

public class ResourceDependent {

	private ResourceDependency resourceDependency;

	public ResourceDependency getResourceDependency() {
		return resourceDependency;
	}

	@Resource
	public void setResourceDependency(ResourceDependency resourceDependency) {
		this.resourceDependency = resourceDependency;
	}

	public void executeDependency() {
		resourceDependency.act();
	}

}

Dependency:

public class ResourceDependency {

	private String message;

	public String getMessage() {
		return message;
	}

	public void setMessage(String message) {
		this.message = message;
	}

	public void act() {
		// TODO Auto-generated method stub
		System.out.println("Message from Dependency:" + this.getMessage());
	}

}

....##MAIN

ResourceDependent da = (ResourceDependent) context.getBean("resourceDependent");
da.executeDependency();


OUTPUT:
Message from Dependency:Chuck!

[Izanami Caster]

Just found this in the spring.io documentation:

Similar to @Autowired, @Resource may fall back to standard bean type matches (i.e. find a primary type match instead of a specific named bean) as well as resolve well-known "resolvable dependencies": the BeanFactory interface, the ApplicationContext interface, the ResourceLoader interface, the ApplicationEventPublisher interface and the MessageSource interface. Note that this only applies to @Resource usage with no explicit name specified!


Ref:https://docs.spring.io/spring-framework/docs/3.0.0.M3/reference/html/ch04s11.html

I've found my answer.

Thanks,
IC