Board Thread:Support Requests - Designing Your Wiki/@comment-4988763-20170723230947/@comment-27345308-20170723231250

Your wiki most likely isn't using Java unless it's specifically related to Java programming.

If you mean JavaScript, you can check if your wiki has JavaScript enabled by going to MediaWiki:Common.js page on your wiki. If you can edit it, it's enabled. If you can't and you want to enable it on your wiki, contact Staff about it.