Upgrade from java 7 to 8
Upgrade from java 7 to 8

... as versions [24.1.1,) of guava (required to fix CVE-2018-10237)
no longer include predicates as they used to.
It is therefore necessary to switch to the predicates from the standard
library, which have been introducted in Java 8.

marccarre/xml-stream-filter,marccarre/xml-stream-filter