Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/21278
it fails with
```
Quitting from lines 65-67 (sparkr-vignettes.Rmd)
Error: processing vignette 'sparkr-vignettes.Rmd' failed with diagnostics:
Java version check failed. Please make sure Java is installed and set
JAVA_HOME to point to the installation directory.
Execution halted
```
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