egalpin commented on code in PR #22216:
URL: https://github.com/apache/beam/pull/22216#discussion_r927955854


##########
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsub/PubsubCoderProviderRegistrar.java:
##########
@@ -31,6 +31,7 @@ public class PubsubCoderProviderRegistrar implements 
CoderProviderRegistrar {
   @Override
   public List<CoderProvider> getCoderProviders() {
     return ImmutableList.of(
+        CoderProviders.forCoder(TypeDescriptor.of(PubsubMessage.class), 
PubsubMessageCoder.of()),

Review Comment:
   I'm not 100% confident in the order that is required here, or if order 
matters.  I couldn't find documentation around how coders are resolved when 
multiple coders are registered for the same class.  I tried tracing the code 
but wasn't able to come up with a definitive answer



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