如何在没有任何XML和没有Spring特定注释的情况下将JSR 330与Spring一起使用?

时间:2018-07-26 17:26:38

标签: java spring dependency-injection spring-annotations jsr330

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:

  1. 使用JSR330
  2. 使用Spring作为实现
  3. 没有特定于弹簧的注释,仅允许使用JSR330注释。这不是规范的全部内容。
  4. 没有XML

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)。

1 个答案:

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。