Do you need to install Oracle's Java? Cuz if you don't need you can just open a terminal and type sudo apt install default-jre -y and it's ready to use (if you're on debian-based distros) More on reddit.com

Installing Java on Linux is best done via the package manager. Most distos ship openjdk. More on reddit.com

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I played around with it a long time ago but eventually gave up on packaging jdtls. I now simply use lsp-install-server. I recall a big problem being that jdtls insisted on writing to its installation directory, which of course doesn't work with the Nix store. It's probably possible to get around with a bit of effort. More on reddit.com