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https://issues.apache.org/jira/browse/FLINK-29890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17677892#comment-17677892
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Chalres Tan commented on FLINK-29890:
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[~lsy] I believe this is the same issue as
https://issues.apache.org/jira/browse/FLINK-28897 which has been marked as fix.
However, the above example shows that in Flink 1.16.0, this has not been fixed.
> UDFs classloading from JARs in 1.16 is broken
> ---------------------------------------------
>
> Key: FLINK-29890
> URL: https://issues.apache.org/jira/browse/FLINK-29890
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Runtime
> Affects Versions: 1.16.0
> Reporter: Alexander Fedulov
> Priority: Critical
>
> 1.16 introduced a lot of changes with respect to classloading in the Table
> API. The way UDFs could previously be loaded from JARs in 1.15 does not work
> in 1.16 anymore - it fails with the ClassNotFound exception when UDFs are
> used at runtime.
> Here is a repository with a reproducible example:
> [https://github.com/afedulov/udfs-flink-1.16/blob/main/src/test/java/com/example/UDFTest.java]
>
> It works as is (Flink 1.15.2) and fails when switching the dependencies to
> 1.16.0.
> Here are some of the PRs that might be related to the issue:
> [https://github.com/apache/flink/pull/20001]
> [https://github.com/apache/flink/pull/19845]
> [https://github.com/apache/flink/pull/20211] (fixes a similar issue
> introduced after classloading changes in 1.16)
>
> It is unclear how UDFs can be loaded from JARs in 1.16.
> Ideally, this should be covered by tests and described in the documentation.
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