Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/4942#discussion_r148789659
--- Diff:
flink-core/src/main/java/org/apache/flink/api/java/typeutils/runtime/KryoRegistrationSerializerConfigSnapshot.java
---
@@ -217,7 +217,7 @@ public void read(DataInputView in) throws IOException {
/**
* Placeholder dummy for a previously registered class that can no
longer be found in classpath on restore.
*/
- public static class DummyRegisteredClass {}
+ public static class DummyRegisteredClass implements Serializable {}
--- End diff --
`serialVersionUID` is missing.
---
