grpc-java-polaris consumer how to set namespace ?

[zs121233]

Exception in thread "main" java.lang.IllegalArgumentException: cannot find a NameResolver for polaris://ad.show.retrieval.svc.feeds:57823?namespace=test

VERSION : 1.0.0
CODE :
NameResolverRegistry.getDefaultRegistry().register(new PolarisNameResolverProvider());
String target = POLARIS + serviceName + "?namespace=" + nameSpace;
channel = ManagedChannelBuilder.forTarget(target).usePlaintext()
.build();