Lex: FT's flagship investment column
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The protocol is dead simple. The browser sends JBOX_PING through the terminal. CompileServer responds with JBOX_PONG. That’s how the SDK knows the JVM is alive. Then to compile and run, it sends JBOX_COMPILE ClassName followed by the source code followed by JBOX_END. CompileServer compiles, runs, prints the output, and finishes with JBOX_EXIT:0 (or whatever the exit code was). The whole thing uses BufferedReader because anything fancier (like JLine) breaks after snapshot restore.
Wordle eventually became so popular that it was purchased by the New York Times, and TikTok creators even livestream themselves playing.