Get Java - kreezxil/World-of-Dragons GitHub Wiki

goto https://adoptopenjdk.net/

When you are there do not mess with the options for 1 and 2, these are auto-selected for you based on your system and are the default most common settings to use. Do not touch them.

Instead hit the large blue button which will download the version that is for your computer and it's bit-ness, ie 32 or 64 bit.

Install this copy and then try the program again that didn't like your Java in the first place.