javadoc command not found

e.g. plexus-i18n

Example errors:

Cause: bug in `maven-javadoc-plugin`

junit/surefire NPE

e.g. libphonenumber (yes, that's the source package name).

Example errors:

Upstream aware: https://github.com/junit-team/junit5/issues/809#issuecomment-366812469

No idea what the fix is going to look like for Debian, with junit3 and junit4 packaged.