duyang416 opened a new issue, #13736:
URL: https://github.com/apache/dubbo/issues/13736
环境：
```
dubbo 3.2.10
jdk 1.8
spring-cloud-alibaba 2021.0.5.0
nacos 2.2.3
```
项目需要使用Dubbo协议 + Protobuf序列化的方式，目前按照官方文档，再配置文件中加入了：
``` yaml
dubbo:
protocol:
name: dubbo
port: -1
serialization: protobuf
```
但是在启动时会有如下报错：
```java
java.lang.IllegalStateException: No such extension protobuf for
serialization/org.apache.dubbo.common.serialize.Serialization
at
org.apache.dubbo.config.utils.ConfigValidationUtils.checkMultiExtension(ConfigValidationUtils.java:712)
at
org.apache.dubbo.config.utils.ConfigValidationUtils.checkMultiExtension(ConfigValidationUtils.java:689)
at
org.apache.dubbo.config.utils.ConfigValidationUtils.validateProtocolConfig(ConfigValidationUtils.java:603)
at
org.apache.dubbo.config.utils.DefaultConfigValidator.validate(DefaultConfigValidator.java:38)
at
org.apache.dubbo.config.context.AbstractConfigManager.checkDefaultAndValidateConfigs(AbstractConfigManager.java:620)
at
org.apache.dubbo.config.context.ConfigManager.checkConfigs(ConfigManager.java:302)
at
org.apache.dubbo.config.context.ConfigManager.loadConfigs(ConfigManager.java:282)
at
org.apache.dubbo.config.deploy.DefaultApplicationDeployer.loadApplicationConfigs(DefaultApplicationDeployer.java:255)
at
org.apache.dubbo.config.deploy.DefaultApplicationDeployer.initialize(DefaultApplicationDeployer.java:222)
at
org.apache.dubbo.config.deploy.DefaultModuleDeployer.prepare(DefaultModuleDeployer.java:635)
at
org.apache.dubbo.config.spring.context.DubboConfigApplicationListener.initDubboConfigBeans(DubboConfigApplicationListener.java:85)
at
org.apache.dubbo.config.spring.context.DubboConfigApplicationListener.init(DubboConfigApplicationListener.java:68)
at
org.apache.dubbo.config.spring.context.DubboConfigApplicationListener.onApplicationEvent(DubboConfigApplicationListener.java:59)
at
org.apache.dubbo.config.spring.context.DubboConfigApplicationListener.onApplicationEvent(DubboConfigApplicationListener.java:38)
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.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:133)
at
org.springframework.context.support.AbstractApplicationContext.registerListeners(AbstractApplicationContext.java:892)
at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:588)
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 org.XXXApplication.main(JeecgOmsCloudApplication.java:26)
```
刚开始接触dubbo，希望能解答一下!
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