need add grpc-census

[Jarome07]

if you have this question

Caught a connection error java.lang.NullPointerException:null
change root logging level to debug
the loginfo will print
DNS name not found [response code 3]

and this
iava.lang.classNotFoundException:io.grpc.census.InternalCensusStatsAccessor

add this to pom.xml

<dependency>
    <groupId>io.grpc</groupId>
    <artifactId>grpc-census</artifactId>
    <version>1.59.0</version>
    <scope>runtime</scope>
</dependency>