while (tagslen) {
源码路径：src/routing/ | src/channels/plugins/ | 核心文件：resolve-route.ts、session-key.ts、types.plugin.ts
，这一点在Line官方版本下载中也有详细论述
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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.