小编chu*_*edw的帖子

这里是Spring 3.0的一些奇怪行为。

package com.service.schedule;

import org.springframework.stereotype.Component;

@Component("outroJob")
public class OutroJob {

    public void printMe() {
        System.out.println("running...");
    }

}

和

package com.service.schedule;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.stereotype.Component;

@Component("testeAutowired")
public class TesteAutowired {

    @Autowired
    public TesteAutowired(OutroJob outroJob) {
        outroJob.printMe();
    }

    public static void main(String[] args) {
        ClassPathResource res = new ClassPathResource("applicationContext.xml");
        XmlBeanFactory ctx = new XmlBeanFactory(res);

        OutroJob outroJob = (OutroJob) ctx.getBean("outroJob");
        outroJob.printMe(); // gives: running...

        ctx.getBean("testeAutowired");
    }
}

这些bean均未在applicationContext.xml上声明

因此，行outroJob.printMe（）; 工作正常...打印“正在运行...”

但是，当我尝试获取“ testeAutowired” bean时，它说：

无法实例化Bean类[com.service.schedule.TesteAutowired]：找不到默认的构造函数；默认值为0。嵌套异常是java.lang.NoSuchMethodException：com.service.schedule.TesteAutowired。

问题是：为什么，如果Spring找到了“ outroJob” bean，那么它不会在TesteAutowired构造函数上对其进行自动装配？

似乎很明显它必须做什么...

我究竟做错了什么？

这是我在 /etc/apache2/sites-enabled/hello-world.conf 上的配置

<VirtualHost *:80>
    ServerName hello-world
    DocumentRoot "/home/carlos/dev/github/hello-world/public"

<Directory "/home/carlos/dev/github/hello-world/public">
    AllowOverride None
    Order Allow,Deny
    Allow from All

    <IfModule mod_rewrite.c>
        Options -MultiViews
        RewriteEngine On
        RewriteCond %{REQUEST_FILENAME} !-f
        RewriteRule ^(.*)$ index.php [QSA,L]
    </IfModule>
</Directory>

# uncomment the following lines if you install assets as symlinks
# or run into problems when compiling LESS/Sass/CoffeeScript assets
# <Directory /var/www/project>
#     Options FollowSymlinks
# </Directory>

# optionally disable the RewriteEngine for the asset directories
# which will allow apache to simply reply with …