Oracle released the recent Java 8 security update (u121). The Jenkins builds fail with the following error while building the Javadocs:
Surely, it will be posisble to simply add the mentioned argument, but this will break builds with earlier Java 8 versions.
This is nowhere documented, I haven't seen any documentation about this flag nowhere, so I assume this is a bug in Java. They can't change or add command line parameters in minor updates of Java 8. I will ask on the OpenJDK mailing lists if this is a bug (maybe accidentally backported from Java 9).