zhanjinhao opened a new issue #9808:
URL: https://github.com/apache/dubbo/issues/9808
I have code following about generic provider impl:
``` java
package ap;
import org.apache.dubbo.config.*;
import org.apache.dubbo.config.bootstrap.DubboBootstrap;
import org.apache.dubbo.rpc.service.GenericService;
/**
* @Author ISJINHAO
* @Date 2022/3/11 16:45
*/
public class ApiGenericProvider {
public static void main(String[] args) {
ApplicationConfig applicationConfig = new ApplicationConfig();
applicationConfig.setName("api-generic-provider");
applicationConfig.setQosEnable(false);
RegistryConfig registryConfig = new RegistryConfig();
registryConfig.setAddress("zookeeper://127.0.0.1:2181");
registryConfig.setTimeout(30000);
registryConfig.setUseAsConfigCenter(false);
registryConfig.setUseAsMetadataCenter(false);
ProviderConfig providerConfig = new ProviderConfig();
providerConfig.setRetries(3);
providerConfig.setTimeout(3000);
// 服务提供者协议配置
ProtocolConfig protocol = new ProtocolConfig();
protocol.setName("dubbo");
protocol.setPort(12347);
protocol.setThreads(4);
// 注意：ServiceConfig为重对象，内部封装了与注册中心的连接，以及开启服务端口
// 服务提供者暴露服务配置
ServiceConfig<GenericService> echoServiceConfig = new
ServiceConfig<>();
echoServiceConfig.setInterface("esg.EchoService");
echoServiceConfig.setRef(new EchoGenericService());
echoServiceConfig.setVersion("1.0.0");
echoServiceConfig.setProtocol(protocol);
echoServiceConfig.setGeneric("true");
// 通过DubboBootstrap简化配置组装，控制启动过程
DubboBootstrap.getInstance()
.application(applicationConfig) // 应用配置
.registry(registryConfig) // 注册中心配置
.provider(providerConfig)
.protocol(protocol) // 全局默认协议配置
.service(echoServiceConfig) // 添加ServiceConfig
.start() // 启动Dubbo
.await(); // 挂起等待(防止进程退出）
}
}
```
when i start the application, exception occurred
```
[AppLog] 2022-03-19 13:59:18 [DUBBO] publishProvider getServiceDescriptor
error. providerUrl:
dubbo://192.168.43.11:12347/esg.EchoService?anyhost=true&application=api-generic-provider&deprecated=false&dubbo=2.0.2&dynamic=true&generic=true&interface=esg.EchoService&methods=*&qos.enable=false&release=2.7.15&retries=3&service.name=ServiceBean:/esg.EchoService:1.0.0&side=provider&threads=4&timeout=3000&version=1.0.0,
dubbo version: 2.7.15, current host: 192.168.43.11
java.lang.ClassNotFoundException: esg.EchoService
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at
org.apache.dubbo.registry.client.metadata.store.RemoteMetadataServiceImpl.publishProvider(RemoteMetadataServiceImpl.java:114)
at
org.apache.dubbo.registry.client.metadata.store.RemoteMetadataServiceImpl.publishServiceDefinition(RemoteMetadataServiceImpl.java:98)
at
org.apache.dubbo.registry.client.metadata.MetadataUtils.publishServiceDefinition(MetadataUtils.java:67)
at
org.apache.dubbo.config.ServiceConfig.doExportUrlsFor1Protocol(ServiceConfig.java:532)
at
org.apache.dubbo.config.ServiceConfig.doExportUrls(ServiceConfig.java:339)
at
org.apache.dubbo.config.ServiceConfig.doExport(ServiceConfig.java:314)
at org.apache.dubbo.config.ServiceConfig.export(ServiceConfig.java:238)
at
org.apache.dubbo.config.bootstrap.DubboBootstrap.exportService(DubboBootstrap.java:1099)
at
org.apache.dubbo.config.bootstrap.DubboBootstrap.lambda$exportServices$14(DubboBootstrap.java:1086)
at java.util.HashMap$Values.forEach(HashMap.java:981)
at
org.apache.dubbo.config.bootstrap.DubboBootstrap.exportServices(DubboBootstrap.java:1070)
at
org.apache.dubbo.config.bootstrap.DubboBootstrap.start(DubboBootstrap.java:886)
at ap.ApiGenericProvider.main(ApiGenericProvider.java:51)
```
my env does not have class esg.EchoService, but i think the generic impl
does not need the interface existed in project.
so how do i use the generic impl rightly? can somebody give me advice ?
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