zrlw opened a new issue #381:
URL: https://github.com/apache/dubbo-samples/issues/381


   看日志好像是尚未完成注册就开始进行测试:
   ```
   Failed to invoke the method xxx in the service xxx.xxx. Tried 3 times of the 
providers xxx from the registry xxx on the consumer xxx using the dubbo version 
3.0.4-SNAPSHOT. Last error is: Failed to invoke remote method: xxx, provider: 
xxx, dubbo.metadata-service.url-params=xxx, service{xxx}, cause: 
org.apache.dubbo.remoting.RemotingException: java.lang.NullPointerException
   java.lang.NullPointerException
        at 
org.apache.dubbo.registry.client.InstanceAddressURL.getScopeModel(InstanceAddressURL.java:498)
        at 
org.apache.dubbo.rpc.protocol.tri.TripleClientRequestHandler.writeRequest(TripleClientRequestHandler.java:82)
        at 
org.apache.dubbo.rpc.protocol.tri.TripleClientRequestHandler.write(TripleClientRequestHandler.java:58)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717)
        at 
io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:764)
        at 
io.netty.channel.AbstractChannelHandlerContext$WriteTask.run(AbstractChannelHandlerContext.java:1071)
        at 
io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at 
io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500)
        at 
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
        at 
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at 
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.lang.Thread.run(Thread.java:748)
   ```


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