zhenlineo opened a new pull request, #42222:
URL: https://github.com/apache/spark/pull/42222

   ### What changes were proposed in this pull request?
   Made the stub constructor to throw ClassNotFoundException if called.
   A tiny improvement to not recreate class loaders in executor if stubbing is 
not enabled.
   
   ### Why are the changes needed?
   Enhancement to https://github.com/apache/spark/pull/42069
   Should be merged to 3.5.
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   ### How was this patch tested?
   Unit tests.


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