调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value #2403

ssfyn · 2023-08-28T14:18:52Z

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

The text was updated successfully, but these errors were encountered:

chickenlj · 2023-09-02T07:11:11Z

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？

ssfyn · 2023-09-04T10:28:19Z

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

DMwangnima · 2023-09-28T15:54:05Z

@ssfyn 可以给一份go侧的配置内容吗？

ssfyn · 2023-10-07T09:44:40Z

@ssfyn 可以给一份go侧的配置内容吗？

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: 127.0.0.1:2181
  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"

DMwangnima · 2023-10-08T02:18:35Z

已经找到了问题链路，java侧的配置也能发一下么？

ssfyn · 2023-10-08T09:45:51Z

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

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

FoghostCn · 2023-12-12T08:34:13Z

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
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 ?

DMwangnima · 2023-12-12T08:46:39Z

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
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

FoghostCn · 2023-12-12T09:11:37Z

reproduced success，in dubbo-go tri depens on some stub method in generated pb.go file,
just like that

func (c *GreeterClientImpl) GetDubboStub(cc *triple.TripleConn) GreeterClient {
	return NewGreeterClient(cc)
}

https://github.com/dubbogo/triple/blob/df20316cdac5c5334f6cbf57bd3443cd75a4501f/pkg/triple/dubbo3_conn.go#L79

in metadata module it use low level api to invoke rpc, no pb.go file and GetDubboStub method generated

dubbo-go/metadata/service/local/service_proxy.go

Lines 175 to 190 in d204c4e

    
           func (m *MetadataServiceProxy) GetMetadataInfo(revision string) (*common.MetadataInfo, error) { 
        
           	rV := reflect.ValueOf(revision) 
        
           	const methodName = "getMetadataInfo" 
        
           	inv := invocation.NewRPCInvocationWithOptions(invocation.WithMethodName(methodName), 
        
           		invocation.WithArguments([]interface{}{rV.Interface()}), 
        
           		invocation.WithReply(reflect.ValueOf(&common.MetadataInfo{}).Interface()), 
        
           		invocation.WithAttachments(map[string]interface{}{constant.AsyncKey: "false"}), 
        
           		invocation.WithParameterValues([]reflect.Value{rV})) 
        
           	res := m.Invoker.Invoke(context.Background(), inv) 
        
           	if res.Error() != nil { 
        
           		logger.Errorf("could not get the metadata info from remote provider: %v", res.Error()) 
        
           		return nil, res.Error() 
        
           	} 
        
           	metaDataInfo := res.Result().(*common.MetadataInfo) 
        
           	return metaDataInfo, nil 
        
           }

in fact tri protocol not supported in metadata service rpc client

FoghostCn · 2023-12-12T09:23:18Z

@ssfyn in java server side,set dubbo.application.metadataServiceProtocol=dubbo to avoid this problem, we will fix it in next release

chickenlj added this to the 3.1.2 milestone Dec 12, 2023

FoghostCn mentioned this issue Dec 13, 2023

metadata service tri protocol support #2540

Open

FoghostCn mentioned this issue Jul 12, 2024

Java interoperability issue, go-client call java-server failed when calling MetadataService during service discovery. #2653

Closed

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调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value #2403

调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value #2403

ssfyn commented Aug 28, 2023

chickenlj commented Sep 2, 2023

ssfyn commented Sep 4, 2023

DMwangnima commented Sep 28, 2023

ssfyn commented Oct 7, 2023 •

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DMwangnima commented Oct 8, 2023

ssfyn commented Oct 8, 2023

FoghostCn commented Dec 12, 2023 •

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DMwangnima commented Dec 12, 2023

FoghostCn commented Dec 12, 2023 •

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FoghostCn commented Dec 12, 2023 •

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调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value #2403

调用java服务报错reflect: call of reflect.Value.MethodByName on zero Value #2403

Comments

ssfyn commented Aug 28, 2023

问题

错误讯息

chickenlj commented Sep 2, 2023

ssfyn commented Sep 4, 2023

DMwangnima commented Sep 28, 2023

ssfyn commented Oct 7, 2023 • edited Loading

DMwangnima commented Oct 8, 2023

ssfyn commented Oct 8, 2023

FoghostCn commented Dec 12, 2023 • edited Loading

DMwangnima commented Dec 12, 2023

FoghostCn commented Dec 12, 2023 • edited Loading

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ssfyn commented Oct 7, 2023 •

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