I was getting errors like...
$ ./gradlew build
... snip ...
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':buildSearchableOptions'.
> A problem occurred starting process 'command '/home/rkb/.gradle/caches/modules-2/files-2.1/com.jetbrains/jbre/jbrx-8u202-linux-x64-b1483.49/jre/bin/java''