Though this is not a solution to bring the game to the web there are multiple solutions to bundle java with the game so the user doesn't have to have it installed.
If I remember correctly there are multiple threads discussing various way on the jmonkey engine forum (a game engine for java) https://hub.jmonkeyengine.org/ maybe it helps in the future. I believe that there was also talk about WASM there, however I don't think much happened with that.