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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