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https://issues.apache.org/jira/browse/FLINK-29030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17581236#comment-17581236
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Chesnay Schepler commented on FLINK-29030:
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This in particular happens if a POJO field has an interface type, like
{{List}}, or has a type hierarchy exceeding 1 level (e.g., Type1 extends (Type2
extends Type3)).
> Consider printing a warning if a Pojo contains a generic type
> -------------------------------------------------------------
>
> Key: FLINK-29030
> URL: https://issues.apache.org/jira/browse/FLINK-29030
> Project: Flink
> Issue Type: Improvement
> Components: API / Type Serialization System
> Reporter: Chesnay Schepler
> Priority: Major
> Fix For: 1.17.0
>
>
> Users are encouraged to use POJO types, that will be serialized by the
> PojoSerializer which supports schema evolution.
> If a user does not use a POJO we print an info message, linking to the docs
> and citing potential performance issues.
> However, no such message is printed if a POJO _contains_ a generic type.
> As a result there may be users out there believing to have optimal
> performance and support for schema evolution since, after all, they are able
> to use the POJO serializer, when this may not be the case.
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