code: public static Class[] getParameterTypes(JoinPoint joinPoint) {
          MethodSignature signature = (MethodSignature) joinPoint.getSignature();
          Method method = signature.getMethod();
          return method.getParameterTypes();
      }
docs: Gets parameter types of the join point.
  
  @param joinPoint the join point
  @return the parameter types for the method this object
  represents