[jira] [Created] (FLINK-27974) Potentially wrong classloader being used to create dynamic table sources

["Chesnay Schepler (Jira)" <ji...@apache.org>]

Chesnay Schepler created FLINK-27974:
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             Summary: Potentially wrong classloader being used to create dynamic table sources
                 Key: FLINK-27974
                 URL: https://issues.apache.org/jira/browse/FLINK-27974
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
    Affects Versions: 1.15.0
            Reporter: Chesnay Schepler


A user reported an issue on slack where a job fails in the CLI because of {{ClassNotFoundException: org.apache.flink.table.planner.delegation.ParserFactory}} in {{FileSystemTableFactory#formatFactoryExists}} when trying to load the {{Factory}} service.

While looking through the call stack I noticed that the classloader passed via the context is a thread's context classloader, set in {{CatalogSourceTable#createDynamicTableSource}}.

This seems a bit fishy; since this runs in the context of the CLI this CL is likely the user CL, but the planner classes are loaded in a separate classloader (not in the parent). As a result the planner classes cannot be looked up via the service loader mechanism.



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