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https://issues.apache.org/jira/browse/FLINK-6864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Greg Hogan closed FLINK-6864.
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Resolution: Implemented
master: 450b4241404055ed6638e354be421b83380827c5
> Remove confusing "invalid POJO type" messages from TypeExtractor
> ----------------------------------------------------------------
>
> Key: FLINK-6864
> URL: https://issues.apache.org/jira/browse/FLINK-6864
> Project: Flink
> Issue Type: Improvement
> Components: Documentation, Type Serialization System
> Reporter: Tzu-Li (Gordon) Tai
> Assignee: Fang Yong
> Fix For: 1.5.0
>
>
> When a user's type cannot be treated as a POJO, the {{TypeExtractor}} will
> log warnings such as ".. must have a default constructor to be used as a
> POJO.", " ... is not a valid POJO type because not all fields are valid POJO
> fields." in the {{analyzePojo}} method.
> These messages are often conceived as misleading for the user to think that
> the job should have failed, whereas in fact in these cases Flink just
> fallsback to Kryo and treat then as generic types. We should remove these
> messages, and at the same time improve the type serialization docs at [1] to
> explicitly inform what it means when Flink does / does not recognizes a user
> type as a POJO.
> [1]
> https://ci.apache.org/projects/flink/flink-docs-release-1.3/dev/types_serialization.html#rules-for-pojo-types
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