How do you figure out whether a CLASS is a spring proxy?

In a nutshell

In the AopUtils, we have

    /**
     * Check whether the given object is a JDK dynamic proxy or a CGLIB proxy.
     * <p>This method additionally checks if the given object is an instance
     * of {@link SpringProxy}.
     * @param object the object to check
     * @see #isJdkDynamicProxy
     * @see #isCglibProxy
     */
    public static boolean isAopProxy(@Nullable Object object) {
        return (object instanceof SpringProxy && (Proxy.isProxyClass(object.getClass()) ||
                object.getClass().getName().contains(ClassUtils.CGLIB_CLASS_SEPARATOR)));
    }

In now want to check whether a bean class is proxied without instantiating the bean (i.e. just with its class) in a BeanFactoryPostProcessor.

I thought I could just "translate" above method:

    private fun <T> isAopProxyClass(candidate: Class<T>): Boolean {
        return SpringProxy::class.java.isAssignableFrom(candidate)
            && (
            Proxy.isProxyClass(candidate)
                || candidate.name.contains(CGLIB_CLASS_SEPARATOR)
            )
    }

But this does not detect proxies because SpringProxy::class.java.isAssignableFrom(candidate) is false even for obviously proxied classes.

How do I make this work?

Full picture

I'm in a BeanFactoryPostProcessor and I need the un-proxied bean classes to access certain annotated methods by reflection.

Access happens in a lambda function that will first use the ApplicationContext to retrieve the bean for the class. The bean must not be forcibly instantiated in this BeanFactoryPostProcessor (and in fact should throw an exception if it does because some beans are session-scoped).