[GitHub] [incubator-dubbo] CjqDy opened issue #3791: org.apache.dubbo 2.7.0 + dubbo-registry-nacos 0.0.2

["CjqDy (GitHub)" <gi...@apache.org>]

### Environment

* Dubbo version: 2.7.0
* Java version: 1.8.0_65

### Steps to reproduce this issue

org.apache.dubbo 2.7.0 + dubbo-registry-nacos 0.0.2  无法启动成功
Caused by: java.lang.NoClassDefFoundError: com/alibaba/dubbo/registry/support/AbstractRegistryFactory
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at org.apache.dubbo.common.extension.ExtensionLoader.loadResource(ExtensionLoader.java:672)
	... 26 more


包目录好像匹配不上

com,alibaba  和 org.apache
目前使用的匹配的版本是多少？




What actually happens?

If there is an exception, please attach the exception trace:

```
Just put your stack trace here!
```


[ Full content available at: https://github.com/apache/incubator-dubbo/issues/3791 ]
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