Hi Cisco Community,
I have recently noticed that there is a bug with my version of Cisco ISE at 2.7 patch 4, where I get the following message when I am trying to check the syntax of one of my Downloadable ACLs:
Those are Java errors referencing a lot of internal processes used by ISE. If you've already done the standard troubleshooting for client Java issues (cleared cache, tried another browser, reinstalled the latest version of Java, etc.), I would suggest opening a TAC case to investigate the issue further.