[Octave-bug-tracker] [bug #58312] [octave forge] (io) Defer Java detection until a function is called

[Mike Miller]

Follow-up Comment #6, bug #58312 (project octave):

My thinking was not to scrap the init routine, but to keep it exactly as is,
just move it from PKG_ADD to each public or private function that uses the
Java support that it sets up. You can add a persistent variable to ensure that
it only runs once.

This is similar to several examples in Octave, such as the image functions
which all call 'maybe_initialize_magick', or the symbolic package which
initializes its IPC to SymPy as needed.

FWIW, I believe this warning started with OpenJDK 10 or 11, I have version 11.

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