[GitHub] [incubator-dubbo] yupd opened issue #2736: 使用Main.main(args)方法运行demo报找不到spring容器

[GitHub]

### Environment

* Dubbo version: 2.6.4
* Operating System version: win7
* Java version: 1.8

### Steps to reproduce this issue

1. 修改com.alibaba.dubbo.demo.provider.Provider
```
    public static void main(String[] args) throws Exception {
        System.setProperty("java.net.preferIPv4Stack", "true");

//        ClassPathXmlApplicationContext context = new 
ClassPathXmlApplicationContext(new 
String[]{"META-INF/spring/dubbo-demo-provider.xml"});
//        context.start();
//        System.in.read(); // press any key to exit

        com.alibaba.dubbo.container.Main.main(args);

    }
```

### Actual Result

exception trace:

```
java.lang.IllegalStateException: No such extension 
com.alibaba.dubbo.container.Container by name spring
        at 
com.alibaba.dubbo.common.extension.ExtensionLoader.findException(ExtensionLoader.java:482)
        at 
com.alibaba.dubbo.common.extension.ExtensionLoader.createExtension(ExtensionLoader.java:489)
        at 
com.alibaba.dubbo.common.extension.ExtensionLoader.getExtension(ExtensionLoader.java:309)
        at com.alibaba.dubbo.container.Main.main(Main.java:59)
        at com.alibaba.dubbo.demo.provider.Provider.main(Provider.java:29)
```






[ Full content available at: 
https://github.com/apache/incubator-dubbo/issues/2736 ]
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