Fix Error: Cask 'java' is unavailable in Homebrew

After update brew to latest version, when calling cask related command, it always outputs Error: Cask 'java' is unavailable: No Cask with this name exists., such as brew list --cask. However, the brew command works.

After doing some research, I found Java has been moved to homebrew/core. This makes sense now. I installed java by cask, but it’s not available now and cask throw this error. If I uninstall java from cask, the error should disappear.

This is not easy as cask is broken. Finally, I found this issue: brew cask upgrade fails with “No Cask with this name exists”. After running rm -rf "$(brew --prefix)/Caskroom/java, cask is back.

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