thinker0 commented on pull request #3731:
URL: https://github.com/apache/incubator-heron/pull/3731#issuecomment-967729571
it will fix
```
pex_file = os.environ.get('PEX', None)
if pex_file is not None:
return
normalized_class_path(str(Path(pex_file).resolve(strict=True).parent.parent))
```
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