yadavay-amzn commented on PR #55720:
URL: https://github.com/apache/spark/pull/55720#issuecomment-4418088486

   @attilapiros I verified this both in-process (calling `run()` twice in the 
same JVM) and cross-process (forking separate JVMs with `Storage.Folder` 
sharing a temp cache directory). The NPE does not reproduce in either case — it 
requires a specific Ammonite classloader state that only occurs in real 
interactive usage (your original reproduction in the JIRA).
   
   Updated the test to directly assert that `newAmmoniteMain` wires 
`Storage.InMemory` (which is the exact semantic the fix adds), and smoke-tests 
the restart scenario by calling `run()` twice. Also fixed the non-ASCII 
character.


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