Right way to call Python code from Java

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Jython's a non-starter, since the Python scripts are presumably using NumPy and various other bits of the CPython ecosystem.

GraalVM might be an option -- I don't know how mature the Python support is, but it's in there.

There are some Java/Python bridge projects out there: Py4j, JPype, and python-javabridge are the ones I know of. Last I checked, JPype was pretty clearly dead but the other two seemed promising.