jockercheng91 opened a new issue, #15710: URL: https://github.com/apache/dubbo/issues/15710
### Pre-check - [x] I am sure that all the content I provide is in English. ### Search before asking - [x] I had searched in the [issues](https://github.com/apache/dubbo/issues?q=is%3Aissue) and found no similar issues. ### Apache Dubbo Component Java SDK (apache/dubbo) ### Dubbo Version Apache dubbo： 3.3.0 ### Steps to reproduce this issue only one provider： @DubboService(registry = "epasregistry") public class Dubbo3HelloServiceImpl implements HelloService { @Override public String sayHello(String name) { long l = System.currentTimeMillis(); System.out.println(l); return String.valueOf(l) + "-" + name; } } properties： dubbo.protocols.dubbo.name=dubbo dubbo.protocols.dubbo.port=50051 dubbo.protocols.dubbo.dispatcher=message dubbo.protocols.dubbo.threads=500 dubbo.protocols.dubbo.ext-protocol=tri, dubbo.protocols.dubbo.serialization=fastjson2 dubbo.protocols.dubbo.payload=20485760 启动报错： Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2025-09-28 17:12:13.948 [main] ERROR o.s.boot.SpringApplication - Application run failed java.lang.IllegalStateException: No such extension org.apache.dubbo.rpc.Protocol by name tri.default, no related exception was found, please check whether related SPI module is missing. at org.apache.dubbo.common.extension.ExtensionLoader.findException(ExtensionLoader.java:768) at org.apache.dubbo.common.extension.ExtensionLoader.createExtension(ExtensionLoader.java:775) at org.apache.dubbo.common.extension.ExtensionLoader.getExtension(ExtensionLoader.java:575) at org.apache.dubbo.common.extension.ExtensionLoader.getExtension(ExtensionLoader.java:549) at org.apache.dubbo.config.ServiceConfig.findConfiguredPort(ServiceConfig.java:1107) at org.apache.dubbo.config.ServiceConfig.buildUrl(ServiceConfig.java:831) at org.apache.dubbo.config.ServiceConfig.doExportUrlsFor1Protocol(ServiceConfig.java:615) at org.apache.dubbo.config.ServiceConfig.doExportUrls(ServiceConfig.java:600) at org.apache.dubbo.config.ServiceConfig.doExport(ServiceConfig.java:555) at org.apache.dubbo.config.ServiceConfig.export(ServiceConfig.java:343) at org.apache.dubbo.config.deploy.DefaultModuleDeployer.exportServiceInternal(DefaultModuleDeployer.java:495) at org.apache.dubbo.config.deploy.DefaultModuleDeployer.exportServices(DefaultModuleDeployer.java:442) at org.apache.dubbo.config.deploy.DefaultModuleDeployer.startSync(DefaultModuleDeployer.java:177) at org.apache.dubbo.config.deploy.DefaultModuleDeployer.start(DefaultModuleDeployer.java:159) at org.apache.dubbo.config.spring.context.DubboDeployApplicationListener.onContextRefreshedEvent(DubboDeployApplicationListener.java:167) at org.apache.dubbo.config.spring.context.DubboDeployApplicationListener.onApplicationEvent(DubboDeployApplicationListener.java:153) at org.apache.dubbo.config.spring.context.DubboDeployApplicationListener.onApplicationEvent(DubboDeployApplicationListener.java:52) at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:178) at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:171) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:145) at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:429) at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:386) at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:949) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:594) at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:732) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:409) at org.springframework.boot.SpringApplication.run(SpringApplication.java:308) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1300) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1289) at com.iflytek.edu.dubbo3.samples.muti.register.CompDubbo3Server.main(CompDubbo3Server.java:17) Checked all the code, but no tri.default extension protocol was found. In what scenarios would this protocol be used by default? When the service publisher is explicitly specified with @DubboService(registry = "epasregistry", protocol = "dubbo"), it starts normally. ### What you expected to happen Expect normal startup and normal RPC calls. ### Anything else _No response_ ### Are you willing to submit a pull request to fix on your own? - [ ] Yes I am willing to submit a pull request on my own! ### Code of Conduct - [x] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. 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