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

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> Load the external `*.class` files to retransform the loaded classes in JVM.
Reference: [Instrumentation#retransformClasses](https://docs.oracle.com/javase/8/docs/api/java/lang/instrument/Instrumentation.html#retransformClasses-java.lang.Class...-)
### Options
|Name|Specification|
|---:|:---|
|`[c:]`|hashcode of the class loader|
|`[classLoaderClass:]`| The class name of the ClassLoader that executes the expression. |
|`[p:]`|absolute path of the external `*.class`, multiple paths are separated with 'space'|
### Restrictions of the retransform command
* New field/method is not allowed
* The function that is running, no exit can not take effect.