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

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

    [ https://issues.apache.org/jira/browse/FLINK-35555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17853121#comment-17853121 ] 

Zhanghao Chen commented on FLINK-35555:
---------------------------------------

[~Weijie Guo] WDTY about the suggested fix?

> Serializing List with null values throws NPE
> --------------------------------------------
>
>                 Key: FLINK-35555
>                 URL: https://issues.apache.org/jira/browse/FLINK-35555
>             Project: Flink
>          Issue Type: Sub-task
>          Components: API / Type Serialization System
>    Affects Versions: 1.20.0
>            Reporter: Zhanghao Chen
>            Priority: Major
>             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 called {{NullableElementListSerializer}} and the corrsponding TypeInformation called {{NullableElementListTypeInfo}} that allows null values for serializing user objects, and leaves the existing {{ListSerializer}} and {{ListTypeInfo}} for Flink's internal state use.



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