I think it would be useful to have an interface that doesn't affect the .Rprofile, since as soon as you put anything in that file your user ~/.Rprofile will not be run. I'm imagining something like rJavaEnv::use_java(21) which would download java 21 and then set the appropriate environment variables.
Since, as you say, it's not possible to switch java versions within a session, this function might need to error if JAVA_HOME is already set.
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