1.application启动类上面是否缺少注解@DubboComponentScan；
2.调用方的注解是否是dubbo的@Reference；
3.service层的注解是否是dubbo的@Service（不是spingboot的）；
4.调用方和service层的注解版本是否一致；
@Reference(version = "1.0", check = false) @Service(version = "1.0"）
RpcException: No provider available from registry 问题排查方案
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