我想使用JSR330(@Inject @ Named,@ Singleton等)。因此,由于通常使用spring,因此我想使用spring作为基础实现。但是我不知道是否可以使用:
我尝试以下操作均未成功:
package org.di.spring;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.tomerbd.snippets.nlp.OpenNLP;
import javax.inject.Inject;
// A failed attempt to achieve: DI + JSR330 + Spring + NoSpring Specific Annotations + No XML
// I didn't want to have any spring annotations but it looks like I have to, wanted to be pure JSR330.
@Configuration
@ComponentScan
public class DIJSR330NoXML {
public static class UseMe {
public String getMe() { return "here I am"; }
}
public static class IWillUseYou {
@Inject private UseMe useMe;
public String letsUseHim() {
return useMe.getMe();
}
}
public static void main(String[] args) throws Exception {
ApplicationContext ctx = new AnnotationConfigApplicationContext("org.di.spring");
((AnnotationConfigApplicationContext) ctx).refresh();
IWillUseYou user = ctx.getBean(IWillUseYou.class); // any other way to get class? I don't want to use spring annotations only jsr330 please with spring as impl!
System.out.println(user.letsUseHim());
}
}
得到失败的输出:
20:25:38.509 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Eagerly caching bean 'DIJSR330NoXML' to allow for resolving potential circular references
20:25:38.564 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Finished creating instance of bean 'DIJSR330NoXML'
20:25:38.566 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.springframework.context.event.internalEventListenerFactory'
20:25:38.794 [main] DEBUG org.springframework.context.annotation.AnnotationConfigApplicationContext - Unable to locate LifecycleProcessor with name 'lifecycleProcessor': using default [org.springframework.context.support.DefaultLifecycleProcessor@51c693d]
20:25:38.805 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'lifecycleProcessor'
20:25:38.813 [main] DEBUG org.springframework.core.env.PropertySourcesPropertyResolver - Could not find key 'spring.liveBeansView.mbeanDomain' in any property source
Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.di.spring.DIJSR330NoXML$IWillUseYou' available
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:347)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:334)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1107)
at org.di.spring.DIJSR330NoXML.main(DIJSR330NoXML.java:31)
Process finished with exit code 1
因此,如果JSR330提供了DI,并且spring支持JSR330,那么是否可以使用带有 Only JSR 330注释且没有任何Spring XML的Spring?
如果这不可能,那就不可能告诉我,为了使其正常工作,我需要使用的最小弹簧注释的绝对最小集合是什么(请没有xml)。
答案 0 :(得分:2)
javax.inject
中所有被理解为JSR330
的注释(包括这些命名的注释)只是一个API,即应用接口提供了没有任何实现的接口。
这意味着按原样使用这些注释不会触发任何效果,因为没有类,容器,也没有任何东西可以监视这些注释的使用位置。 Java SE和Java EE均未提供任何IoC(控制反转)容器。您必须包括这些的实现框架-Spring是一个很好的例子。
看看ex。 JBoss Weld。此实现和其他实现的配置方式(注释,XML,任何其他不同)都是单独的。