This seems to be regression either in 8u111/8u121 as submitter claims
Occasional builds will fail to validate jars once I installed JRE 8u121
java Web Start Error: Unsigned application requesting unrestricted access to system Unsigned resource:

This issue has been discussed over stackoverflow - http://stackoverflow.com/questions/41884302/sporadic-jar-verifies-through-cmd-but-fails-on-launching-jnlp-file-through-javaw