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arthas/tutorials/katacoda/command-mc-redefine-en/mc.md

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> Memory compiler, compiles `.java` files into `.class` files in memory.
The classloader can be specified with the `-c`/`--classLoaderClass` option, the output directory can be specified with the `-d` option.
After compiling the `.class` file, you can use the redefine command to re-define the loaded classes in JVM.