[GitHub] [dubbo] victorqian opened a new issue, #12265: 3.2.0版本调用多协议接口，出现空指针错误

Mon, 08 May 2023 18:19:34 -0700 


victorqian opened a new issue, #12265:
URL: https://github.com/apache/dubbo/issues/12265

   依赖：
   <dependency>
          <groupId>org.apache.dubbo</groupId>
          <artifactId>dubbo</artifactId>
           <version>3.2.0</version>
    </dependency>
   
   Provider端使用3.0.10版本，并且服务暴露双协议: dubbo和tri协议
   
   Consumer升级至3.2.0版本，进行调用时，报如下错误：
   [2023-05-08 15:15:08,503] [WARN ] 
[org.apache.dubbo.rpc.protocol.tri.stream.StreamUtils ?] [main] dstTraceId:[]  
[DUBBO] Meet exception when convert single attachment key:version value=null, 
dubbo version: 3.2.0, current host: 192.168.3.217, error code: 4-1. This may be 
caused by , go to https://dubbo.apache.org/faq/4/1 to find instructions.  []
   java.lang.NullPointerException: null
        at 
org.apache.dubbo.rpc.protocol.tri.stream.StreamUtils.convertSingleAttachment(StreamUtils.java:137)
        at 
org.apache.dubbo.rpc.protocol.tri.stream.StreamUtils.convertAttachment(StreamUtils.java:107)
        at 
org.apache.dubbo.rpc.protocol.tri.RequestMetadata.toHeaders(RequestMetadata.java:74)
        at 
org.apache.dubbo.rpc.protocol.tri.call.TripleClientCall.sendMessage(TripleClientCall.java:173)
        at 
org.apache.dubbo.rpc.protocol.tri.observer.ClientCallToObserverAdapter.onNext(ClientCallToObserverAdapter.java:44)
        at 
org.apache.dubbo.rpc.protocol.tri.TripleInvoker.invokeUnary(TripleInvoker.java:247)
   
   
经过debug发现，ServiceDiscoveryRegistryDirectory中的invoke方法，在协议变更时，会往Attachment中设置group和version参数，如果这两个参数未使用，则会设置为null，最后导致空指针。
   
![image](https://user-images.githubusercontent.com/10111872/236760774-627a1486-4dd3-42de-a896-195f07af6dc6.png)
   
   请问这是预期中的现象吗？
   


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