Alexander Fedulov created FLINK-29890:
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Summary: 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
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, I believe, 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 also should be covered by tests and described in the
documentation.
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