You sure one of the updates wasn't a java update? HZ does not work with java8 as of yet
On my Windows system, I have Java 8 working with HZ just fine (I did have to change path statements to reflect new version).
But on Linux, I get this:
java version "1.7.0_65"
OpenJDK Runtime Environment (IcedTea 2.5.3) (7u71-2.5.3-0ubuntu0.14.04.1)
OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)
So :/
Post-edit: typing Java in search bar confirms version 7 is installed... So that should be good? Sigh... Linux!

2nd post-edit: I extracted lib & nhz.jar from the archive and overwrote existing installation, but that changed nothing either :/