[jira] [Created] (FLINK-35555) Serializing List with null values throws NPE

["Zhanghao Chen (Jira)" <ji...@apache.org>]

Zhanghao Chen created FLINK-35555:
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             Summary: Serializing List with null values throws NPE
                 Key: FLINK-35555
                 URL: https://issues.apache.org/jira/browse/FLINK-35555
             Project: Flink
          Issue Type: Bug
          Components: API / Type Serialization System
    Affects Versions: 1.20.0
            Reporter: Zhanghao Chen
             Fix For: 1.20.0


FLINK-34123 introduced built-in serialization support for java.util.List, which relies on the existing {{ListSerializer}} impl. However, {{ListSerializer}} does not allow null values, as it is originally designed for serializing {{ListState}} only where null value is explicitly forbidden in the contract.

Directly adding null marker to allow null values will break backwards state compatibility, so we'll need to introduce a new List serializer and corrsponding TypeInformation that allows null values for serializing user objects.



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