XComp commented on pull request #15020:
URL: https://github.com/apache/flink/pull/15020#issuecomment-787030241


   Sorry for not getting back earlier: I second @wangyang0918 proposal. The 
code should be easier to test after the proposed change. Additionally, the 
`JarsOnClassPath` singleton seems to be only relevant to what is now 
`ScanClassPathPackagedProgramRetriever`.


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