DJuR opened a new issue, #6015:
URL: https://github.com/apache/rocketmq/issues/6015

   code:
   ```
    public static void main(String[] args) throws ClientException {
           String endpoint = "localhost:9876";
           String topic = "TopicTest";
   
           ClientServiceProvider clientServiceProvider = 
ClientServiceProvider.loadService();
           ClientConfigurationBuilder clientConfigurationBuilder = 
ClientConfiguration.newBuilder().setEndpoints(endpoint);
           ClientConfiguration build = clientConfigurationBuilder.build();
           Producer producer = 
clientServiceProvider.newProducerBuilder().setTopics(topic)
                   .setClientConfiguration(build)
                   .build();
   
           Message message = clientServiceProvider.newMessageBuilder()
                   .setTag(topic)
                   .setKeys("messageKey")
                   .setTag("messageTag")
                   .setBody("messageBody".getBytes(StandardCharsets.UTF_8))
                   .build();
   
           SendReceipt send = producer.send(message);
           System.out.println(send.getMessageId());
   
       }
   ```
   
   Caused by: java.util.concurrent.ExecutionException: 
org.apache.rocketmq.shaded.io.grpc.StatusRuntimeException: UNAVAILABLE: Failed 
ALPN negotiation: Unable to find compatible protocol
   Channel Pipeline: [SslHandler#0, ProtocolNegotiators$ClientTlsHandler#0, 
WriteBufferingAndExceptionHandler#0, DefaultChannelPipeline$TailContext#0]
   


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