Github user shivaram commented on the issue:
https://github.com/apache/spark/pull/16596
`spark-submit` eventually finds java from
https://github.com/apache/spark/blob/a115a54399cd4bedb1a5086943a88af6339fbe85/bin/spark-class#L26
and uses the bash builtin `command` - In fact it looks like using `which` is
discouraged (http://stackoverflow.com/a/677212/4577954) but I'm not sure if we
have a better thing to call from R.
So another way to do this might be to have a `find-java` shell script that
is part of the R package (and thus always available) and call that. But
handling windows support etc. becomes a pain then ?
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