Hey Andrew, I have no idea whether this is feasible, any thoughts? :P

Had a quick look, and found that ecj (eclipse compiler) has this warning, but javac does not. I don't think this would really be a replacement for proguard's optimization pass since proguard removes dead code, which in turn make more fields become write-only.

Yeah, now that I thought about this more it seems less likely to be valuable than I thought as you said, because probably very few of them are actually write-only in the source (though some might be). If there's a reasonably achievable way to do this (in findbugs or something) then it wouldn't be a bad idea to enable it, since it might well catch bugs, but I'm not sure it's worth any significant effort to actually implement. Feel free to just wontfix if you don't think this is likely ;)

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Not an infra issue.