Just as the title said, there is no file for opening java minecraft server on the official webiste. It is rather strange there is only one for bedrock edition. But somehow I was able to download one from another site which is made by a youtuber. So it would probably be best for the official site to have one as well since it is not safe to have people downloading stuff from unofficial sites. Could be danagerous if the creator of the site has malicious intent.