Otherwise your copy of Spiral Knights might get banned from running.
See https://www.java.com/en/download/help/java_blocked.xml
Stick to Java 1.7.0 update 45 at most if you don't want (or know how) to edit your permissions.
For a workaround see http://forums.spiralknights.com/en/node/97074#comment-874308
Someone needs to repackage the downloadable non-steam version for macs then. It appears that the patch from a month ago missed that one then. Specifically the standalone manual download linked at http://www.spiralknights.com/play.xhtml
Have someone verify http://gamemedia.spiralknights.com/spiral/client/spiral-install.dmg
This has already been resolved, details here.