求助：Spring 如何在程序中调用其它jar包中装配好的对象

[WLFIGHTER]

我在一个jar包中使用spring配置好了一个对象hello，我想让该对象被其它jar包调用。但是我调用该对象的时候，spring总是报找不到该对象。麻烦各位大神帮我看一下。

错误信息如下：

 Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@57baeedf: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,proxy,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'proxy': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void com.learn.HelloProxy.setHello(com.learn.Hello); nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.learn.Hello] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Qualifier(value=hello)}
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)

这是调用的代码：

package com.learn;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class App {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("classpath*:**/bean.xml");
        HelloProxy obj = (HelloProxy) context.getBean("proxy");
        System.out.println(obj.getHello().getMessage());
    }
}

package com.learn;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;

public class HelloProxy {
    Hello hello;

    @Autowired
    public void setHello(@Qualifier("hello")Hello hello) {
        this.hello = hello;
    }

    public Hello getHello() {
        return this.hello;
    }
}

spring配置文件：

<?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"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:jaxws="http://cxf.apache.org/jaxws"
       xmlns:task="http://www.springframework.org/schema/task"
       xmlns:http-conf="http://cxf.apache.org/transports/http/configuration"
       xmlns:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="
            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
            http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.1.xsd
            http://cxf.apache.org/jaxws http://cxf.apache.org/schemas/jaxws.xsd
            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
            http://cxf.apache.org/transports/http/configuration
            http://cxf.apache.org/schemas/configuration/http-conf.xsd
            http://www.springframework.org/schema/util
            http://www.springframework.org/schema/util/spring-util-3.1.xsd"
       default-autowire="byName">
    <context:annotation-config />


    <bean id="proxy" class="com.learn.HelloProxy">
    </bean>
</beans>

[a-ray-of-sunshine]

spring 容器在创建 proxy 对象的时候，也就是 初始化 com.learn.HelloProxy 对象的时候，需要注入 hello 对象

    @Autowired
    public void setHello(@Qualifier("hello")Hello hello) {
        this.hello = hello;
    }

而配置文件并没有 hello 对象的相关 bean 的配置。所以，上面方法中的 hello 对象注入失败，spring 容器就启动失败了。

[WLFIGHTER]

我想直接获取另一个jar中spring已经配置好的‘hello’对象，这样能实现吗？

[WLFIGHTER]

@a-ray-of-sunshine 我想直接获取另一个jar中spring已经配置好的‘hello’对象，这样能实现吗？

[a-ray-of-sunshine]

不行，不能获取到。不同的jar ，自然是不同的 ApplicationContext，hello对象是在你当前的 context 并不可见，所以无法获取到。