code: public static Method getMethodFromTarget(JoinPoint joinPoint, String methodName) {
          return getDeclaredMethod(joinPoint.getTarget().getClass(), methodName,
                  getParameterTypes(joinPoint));
      }
docs: Gets a {@link Method} object from target object by specified method name.
  
  @param joinPoint  the {@link JoinPoint}
  @param methodName the method name
  @return a {@link Method} object or null if method with specified <code>methodName</code> doesn't exist