private static HelloReply buildReply(Object message) {
        return HelloReply.newBuilder().setMessage(String.valueOf(message)).build();
    }
Sends a {@link HelloReply} when each {@link HelloRequest} is received. The response will be completed
when the request is completed.
it/grpc/java/src/test/java/com/linecorp/armeria/grpc/java/TestServiceImpl.java