run dubbo模块, 注册中心为nacos找不到类

Exception in thread "main" java.lang.IllegalStateException: Failed to load extension class(interface: interface org.apache.dubbo.registry.RegistryFactory, class line: com.alibaba.dubbo.registry.nacos.NacosRegistryFactory) in jar:file:/D:/dev/workbench/dev/apache/repo/com/alibaba/dubbo-registry-nacos/0.0.2/dubbo-registry-nacos-0.0.2.jar!/META-INF/dubbo/com.alibaba.dubbo.registry.RegistryFactory, cause: com/alibaba/dubbo/registry/support/AbstractRegistryFactory
at org.apache.dubbo.common.extension.ExtensionLoader.loadResource(ExtensionLoader.java:675)
at org.apache.dubbo.common.extension.ExtensionLoader.loadDirectory(ExtensionLoader.java:643)
at org.apache.dubbo.common.extension.ExtensionLoader.loadExtensionClasses(ExtensionLoader.java:624)
at org.apache.dubbo.common.extension.ExtensionLoader.getExtensionClasses(ExtensionLoader.java:595)
at org.apache.dubbo.common.extension.ExtensionLoader.getSupportedExtensions(ExtensionLoader.java:373)
at org.apache.dubbo.common.extension.factory.SpiExtensionFactory.getExtension(SpiExtensionFactory.java:32)
at org.apache.dubbo.common.extension.factory.AdaptiveExtensionFactory.getExtension(AdaptiveExtensionFactory.java:47)
at org.apache.dubbo.common.extension.ExtensionLoader.injectExtension(ExtensionLoader.java:562)
at org.apache.dubbo.common.extension.ExtensionLoader.createExtension(ExtensionLoader.java:529)
at org.apache.dubbo.common.extension.ExtensionLoader.getExtension(ExtensionLoader.java:344)
at org.apache.dubbo.rpc.Protocol$Adaptive.export(Protocol$Adaptive.java)
at org.apache.dubbo.config.ServiceConfig.doExportUrlsFor1Protocol(ServiceConfig.java:553)
at org.apache.dubbo.config.ServiceConfig.doExportUrls(ServiceConfig.java:402)
at org.apache.dubbo.config.ServiceConfig.doExport(ServiceConfig.java:363)
at org.apache.dubbo.config.ServiceConfig.export(ServiceConfig.java:345)
at org.apache.dubbo.config.spring.ServiceBean.export(ServiceBean.java:318)
at org.apache.dubbo.config.spring.ServiceBean.onApplicationEvent(ServiceBean.java:112)
at org.apache.dubbo.config.spring.ServiceBean.onApplicationEvent(ServiceBean.java:58)
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:398)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:355)
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:882)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:144)
at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:95)
at com.alibaba.fescar.samples.dubbo.starter.DubboAccountServiceStarter.main(DubboAccountServiceStarter.java:34)
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:763)
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:349)
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)
... 27 more
Caused by: java.lang.ClassNotFoundException: com.alibaba.dubbo.registry.support.AbstractRegistryFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 42 more

Start at com.alibaba.fescar.samples.dubbo.starter.DubboAccountServiceStarter.java line 34 and follow the Dubbo export path into ExtensionLoader. Inspect the dubbo-registry-nacos 0.0.2 JAR and runtime dependencies for the missing com.alibaba.dubbo.registry.support.AbstractRegistryFactory, then run the starter with Nacos configured. Done means the module starts without the NoClassDefFoundError.

Written by the indexing model from the issue text.