Ok, I'm not sure if this is just me or not... But pretty much everything when it comes to Java and C++ REPLs is broken. The little yellow greater than sign that appears below the version of the language doesn't appear. Everything for input is a rectangle, when the area doesn't have focus it is just an outline, when it does it's completely white. Also, when the program ends, the greater than sign still doesn't appear, the cursor doesn't change. Also, (this is the weirdest), on input when I hit arrow keys, something strange happens. For up arrow key: ^[[A, down arrow key: ^[[B, for right arrow key: ^[[C, for left arrow key: ^[[D. If someone could fix this it would be great, thanks!
Repl.it has recently released their xterm console, which works differently from the old console. Maybe there will be an option at some point to change this.