提供了基于 Javassist 的字节码操作相关的实用类和扩展属性及方法
| ClassTransformer | Represents class transformer interface ClassTransformer : TransformListener | 
| JavassistTransformer | Represents bytecode transformer using Javassist class JavassistTransformer : Transformer | 
| javassist.ClassPool | |
| javassist.CtClass |