snuyanzin commented on code in PR #28:
URL: 
https://github.com/apache/flink-connector-gcp-pubsub/pull/28#discussion_r1641831775


##########
flink-connector-gcp-pubsub/src/main/java/org/apache/flink/streaming/connectors/gcp/pubsub/emulator/EmulatorCredentialsProvider.java:
##########
@@ -20,12 +20,14 @@
 import com.google.api.gax.core.CredentialsProvider;
 import com.google.auth.Credentials;
 
+import java.io.Serializable;
+
 /**
  * A CredentialsProvider that simply provides the right credentials that are 
to be used for
  * connecting to an emulator. NOTE: The Google provided NoCredentials and 
NoCredentialsProvider do
  * not behave as expected. See 
https://github.com/googleapis/gax-java/issues/1148
  */
-public final class EmulatorCredentialsProvider implements CredentialsProvider {
+public final class EmulatorCredentialsProvider implements CredentialsProvider, 
Serializable {

Review Comment:
   Looks like we missed it
   according to Flink contribution guide there should be `serialVersionUID` 
   
https://flink.apache.org/how-to-contribute/code-style-and-quality-java/#java-reflection



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