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Posted to notifications@dubbo.apache.org by "ssfyn (via GitHub)" <gi...@apache.org> on 2023/08/28 14:18:55 UTC
[GitHub] [dubbo-go] ssfyn opened a new issue, #2403: 调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value
ssfyn opened a new issue, #2403:
URL: https://github.com/apache/dubbo-go/issues/2403
### 问题
* go调用go的服务能能跑通，但是go调用java的服务时报错
* 通过看zk内容发现go的服务的`dubbo.metadata-service.url-params`中`proto`是`dubbo`，但java的服务是`tri`，不确定和这个有没有关系。
### 错误讯息
```
panic: reflect: call of reflect.Value.MethodByName on zero Value
goroutine 130 [running]:
reflect.Value.MethodByName({0x0?, 0x0?, 0x1400066ad58?}, {0x103d55724?, 0x14000181740?})
/usr/local/go/src/reflect/value.go:2026 +0x114
github.com/dubbogo/triple/pkg/triple.getInvoker({0x0?, 0x0?}, 0x15?)
/Users/me/go/pkg/mod/github.com/dubbogo/triple@v1.2.2-rc3/pkg/triple/dubbo3_conn.go:79 +0x194
github.com/dubbogo/triple/pkg/triple.NewTripleClient({0x0, 0x0}, 0x6?)
/Users/me/go/pkg/mod/github.com/dubbogo/triple@v1.2.2-rc3/pkg/triple/dubbo3_client.go:117 +0x764
dubbo.apache.org/dubbo-go/v3/protocol/dubbo3.NewDubboInvoker(0x1400053e300)
/Users/me/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.0/protocol/dubbo3/dubbo3_invoker.go:128 +0x898
dubbo.apache.org/dubbo-go/v3/protocol/dubbo3.(*DubboProtocol).Refer(0x14000346580, 0x1400053e300)
/Users/me/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.0/protocol/dubbo3/dubbo3_protocol.go:137 +0x28
dubbo.apache.org/dubbo-go/v3/metadata/service/local.createProxy({0x10454de80?, 0x1400069a8c0})
/Users/me/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.0/metadata/service/local/metadata_service_proxy_factory.go:69 +0x128
dubbo.apache.org/dubbo-go/v3/metadata/service.(*BaseMetadataServiceProxyFactory).GetProxy(0x103d4f1e7?, {0x10454de80?, 0x1400069a8c0?})
/Users/me/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.0/metadata/service/local_service.go:119 +0x34
dubbo.apache.org/dubbo-go/v3/registry/servicediscovery.GetMetadataInfo({0x10454de80, 0x1400069a8c0}, {0x1400037cc40, 0x20})
/Users/me/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.0/registry/servicediscovery/service_instances_changed_listener_impl.go:209 +0x118
dubbo.apache.org/dubbo-go/v3/registry/servicediscovery.(*ServiceInstancesChangedListenerImpl).OnEvent(0x140002ca360, {0x104539f60?, 0x14000376190})
/Users/me/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.0/registry/servicediscovery/service_instances_changed_listener_impl.go:91 +0x5e0
dubbo.apache.org/dubbo-go/v3/registry/servicediscovery.(*ServiceDiscoveryRegistry).SubscribeURL(0x140001ec870, 0x14000650b40, {0x1045356f0, 0x14000650fc0}, 0x14000199200)
/Users/me/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.0/registry/servicediscovery/service_discovery_registry.go:236 +0x56c
dubbo.apache.org/dubbo-go/v3/registry/servicediscovery.(*ServiceMappingChangedListenerImpl).OnEvent(0x14000276080, {0x104539f90?, 0x14000791ef8?})
/Users/me/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.0/registry/servicediscovery/service_mapping_change_listener_impl.go:84 +0x13c
dubbo.apache.org/dubbo-go/v3/registry/servicediscovery.(*ServiceDiscoveryRegistry).Subscribe(0x140000a42d0, 0x14000650b40, {0x1045356f0?, 0x14000650fc0})
/Users/me/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.0/registry/servicediscovery/service_discovery_registry.go:216 +0x2e4
dubbo.apache.org/dubbo-go/v3/registry/directory.(*RegistryDirectory).Subscribe(0x14000650fc0, 0x14000650b40)
/Users/me/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.0/registry/directory/directory.go:107 +0xd0
created by dubbo.apache.org/dubbo-go/v3/registry/protocol.(*registryProtocol).Refer
/Users/me/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.0/registry/protocol/protocol.go:164 +0x1f4
```
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Re: [I] 调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value [dubbo-go]
Posted by "FoghostCn (via GitHub)" <gi...@apache.org>.
FoghostCn commented on issue #2403:
URL: https://github.com/apache/dubbo-go/issues/2403#issuecomment-1851615956
@ssfyn in java server side,set application.metadataServiceProtocol=dubbo to avoid this problem
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Re: [I] 调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value [dubbo-go]
Posted by "AlexStocks (via GitHub)" <gi...@apache.org>.
AlexStocks closed issue #2403: 调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value
URL: https://github.com/apache/dubbo-go/issues/2403
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Re: [I] 调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value [dubbo-go]
Posted by "DMwangnima (via GitHub)" <gi...@apache.org>.
DMwangnima commented on issue #2403:
URL: https://github.com/apache/dubbo-go/issues/2403#issuecomment-1851548689
> > > 已经找到了问题链路，java侧的配置也能发一下么？
> >
> >
> > 配置文件是这个
> > ```yaml
> > dubbo:
> > application:
> > name: dubbo-springboot-demo-provider
> > protocol:
> > name: tri
> > port: -1
> > registry:
> > address: zookeeper://127.0.0.1:2181
> > ```
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > java这块儿起的服务是直接使用的这个demo： https://github.com/apache/dubbo-samples/tree/master/1-basic/dubbo-samples-triple-unary
>
> 404 - page not found, is 3.2 branch ?
应该是这个https://github.com/apache/dubbo-samples/tree/3.2/1-basic/dubbo-samples-triple-unary
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[GitHub] [dubbo-go] DMwangnima commented on issue #2403: 调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value
Posted by "DMwangnima (via GitHub)" <gi...@apache.org>.
DMwangnima commented on issue #2403:
URL: https://github.com/apache/dubbo-go/issues/2403#issuecomment-1739599890
@ssfyn 可以给一份go侧的配置内容吗？
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Re: [I] 调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value [dubbo-go]
Posted by "ssfyn (via GitHub)" <gi...@apache.org>.
ssfyn commented on issue #2403:
URL: https://github.com/apache/dubbo-go/issues/2403#issuecomment-1751666989
> @ssfyn 可以给一份go侧的配置内容吗？
```yaml
dubbo:
application:
name: go-example
module: example
organization: example
owner: me
environment: local
registries:
demoZK:
protocol: zookeeper
timeout: 3s
address: 127.0.0.1:2181
registry-type: all
metadata-report:
protocol: zk
address: 127.0.0.1:32181
protocols:
triple:
name: tri
port: 20000
provider:
services:
GreeterServerImpl:
protocol: tri
interface: "com.goexample.Greeter"
consumer:
references:
GreeterClientImpl:
interface: "org.apache.dubbo.samples.tri.unary.Greeter"
protocol: "tri"
```
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[GitHub] [dubbo-go] chickenlj commented on issue #2403: 调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value
Posted by "chickenlj (via GitHub)" <gi...@apache.org>.
chickenlj commented on issue #2403:
URL: https://github.com/apache/dubbo-go/issues/2403#issuecomment-1703742026
> 通过看zk内容发现go的服务的dubbo.metadata-service.url-params中proto是dubbo，但java的服务是tri，不确定和这个有没有关系。
请问使用的 dubbo-go 版本是？ 3.1.0 吗？
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Re: [I] 调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value [dubbo-go]
Posted by "FoghostCn (via GitHub)" <gi...@apache.org>.
FoghostCn commented on issue #2403:
URL: https://github.com/apache/dubbo-go/issues/2403#issuecomment-1851587375
reproduced success，in dubbo-go tri depens on some stub method in generated pb.go file,
like that
```go
func (c *GreeterClientImpl) GetDubboStub(cc *triple.TripleConn) GreeterClient {
return NewGreeterClient(cc)
}
```
in metadata module it use low level api to invoke rpc, no GetDubboStub method generated
https://github.com/apache/dubbo-go/blob/d204c4ef491dd22c58c4fd2e0a30e0f9d4e57715/metadata/service/local/service_proxy.go#L175-L190
in fact tri protocol not supported in metadata service rpc
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Re: [I] 调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value [dubbo-go]
Posted by "FoghostCn (via GitHub)" <gi...@apache.org>.
FoghostCn commented on issue #2403:
URL: https://github.com/apache/dubbo-go/issues/2403#issuecomment-1851530506
> > 已经找到了问题链路，java侧的配置也能发一下么？
>
> 配置文件是这个
>
> ```yaml
> dubbo:
> application:
> name: dubbo-springboot-demo-provider
> protocol:
> name: tri
> port: -1
> registry:
> address: zookeeper://127.0.0.1:2181
> ```
>
> java这块儿起的服务是直接使用的这个demo： https://github.com/apache/dubbo-samples/tree/master/1-basic/dubbo-samples-triple-unary
404 - page not found
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Re: [I] 调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value [dubbo-go]
Posted by "DMwangnima (via GitHub)" <gi...@apache.org>.
DMwangnima commented on issue #2403:
URL: https://github.com/apache/dubbo-go/issues/2403#issuecomment-1751895691
已经找到了问题链路，java侧的配置也能发一下么？
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Re: [I] 调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value [dubbo-go]
Posted by "ssfyn (via GitHub)" <gi...@apache.org>.
ssfyn commented on issue #2403:
URL: https://github.com/apache/dubbo-go/issues/2403#issuecomment-1751978975
> 已经找到了问题链路，java侧的配置也能发一下么？
配置文件是这个
```yaml
dubbo:
application:
name: dubbo-springboot-demo-provider
protocol:
name: tri
port: -1
registry:
address: zookeeper://127.0.0.1:2181
```
java这块儿起的服务是直接使用的这个demo：
https://github.com/apache/dubbo-samples/tree/master/1-basic/dubbo-samples-triple-unary
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[GitHub] [dubbo-go] ssfyn commented on issue #2403: 调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value
Posted by "ssfyn (via GitHub)" <gi...@apache.org>.
ssfyn commented on issue #2403:
URL: https://github.com/apache/dubbo-go/issues/2403#issuecomment-1705014542
> > 通过看zk内容发现go的服务的dubbo.metadata-service.url-params中proto是dubbo，但java的服务是tri，不确定和这个有没有关系。
>
> 请问使用的 dubbo-go 版本是？ 3.1.0 吗？
是的
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