I recommend temurin jdk and they have their own packages. Zulu is also good. https://adoptium.net/installation/linux/ https://docs.azul.com/core/install/debian More on reddit.com

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I think the first command will install the LTS version, which is currently 11. This has always been confusing on Debian distros. Are you just running java? Or are you looking to build new java code? Install the jdk if you want to build, not the jre. More on reddit.com

https://wiki.archlinux.org/title/Java Should tell you basically anything you need. Also, you can use the community editions of intellij, I think they are available on the AUR. More on reddit.com