I once wanted to port a little Java application (with no libs except JavaFX) to the web, so I converted it into Dart lang and then compiled it to the web, a bit painful but cool thing.
Not OP here, but it did disappear from the frontpage. I was still pondering about it and left this tab open... frankly I can't think of a good use case for it besides making legacy java apps available via browser. For gaming, I'd probably still use Unity or other game engines. For app development, I probably not gonna develop on Java 11 again which the support gonna be ending in 2026. I'm impressed by this project though.
I use CheerpJ to do new development that is spectacularly cross-platform, runs native on all the major platforms and everywhere else in the browser with a single code base. I don't think there are too many alternatives for that and I suspect Java + CheerpJ is one of the best.
I dunno about standard, but it's been done a bunch.
* As sibling notes, there's ansible (or chef/puppet/salt/...)
* The traditional solution was https://github.com/duncs/clusterssh which opens an xterm to each target plus a window that you type into to mirror input to all of them
* I do the same-ish in tmux with
bind-key a set-window-option synchronize-panes
and I expect screen and such have equivalent features
* Likewise, there are terminal emulators that let you do splits and then select a menu option to mirror input to all of them
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