question: public static Object fastInvoke ( Object obj , String methodName , Class < ? > [ ] parameterTypes , Object [ ] args ) { Class < ? > clazz = obj . getClass ( ) ; FastClass fastClass = fastClassCache . get ( clazz ) ; if ( fastClass == null ) { FastClass newFastClass = FastClass . create ( clazz ) ; fastClass = fastClassCache . putIfAbsent ( clazz , newFastClass ) ; if ( fastClass == null ) { fastClass = newFastClass ; } } Object value = null ; try { value = fastClass . invoke ( methodName , parameterTypes , obj , args ) ; } catch ( InvocationTargetException e ) { JUnsafe . throwException ( e ) ; } return value ; }
target:  Invokes the underlying method, fast invoke using cglib's FastClass.