Telegram Bot Java - how to make the bot work via Webhook?

Question

Java

Good day. I am creating a telegram bot in java using the rubengulas api. And I can't set up a webhook in any way.
I know that there are following rules for webhook, specified in the official telegram documentation:

*Supports IPv4, IPv6 is currently not supported for Webhooks.

*Accepts incoming POSTs from 149.154.167.197-233 on port 443,80,88 or 8443.

*Is able to handle TLS1.0+ HTTPS-traffic.

*Provides a supported, non-wildcard, verified or self-signed certificate.

*Uses a CN or SAN that matches the domain you’ve supplied on setup.

*Supplies all intermediate certificates to complete a verification chain.

I have a domain with a verified certificate. The server listens on port 443 and accepts post requests from addresses 149.154.167.197-233.
I use here this rubengulas api method to create Telegram api

private static TelegramBotsApi createNoSelfSignedTelegramBotsApi() throws TelegramApiException {
        return new TelegramBotsApi(
               "src/main/resources/server.jks",//path to KeyStore for the server 
               "myPassword",                   //Key store password for the serve
               "https://example.com:443",      //External url
               "https://localhost:443");       //Internal url
    }

I got the .jks file using the following commands from the pem files of a valid certificate on the server:

openssl pkcs12 -export -in mydomain.net.crt -inkey mydomain.key > keypair.p12
keytool -importkeystore -srckeystore keypair.p12 -destkeystore server.jks -srcstoretype pkcs12

I started the bot like this:

ApiContextInitializer.init();
    TelegramBotsApi botsApi = new TelegramBotsApi(
                           "src/main/resources/server.jks",
                           "mypassword",
                           "https://example.com:443",
                           "https://localhost:443");
   BotHook webhookBot = new BotHook(options);
   botsApi.registerBot(webhookBot)

The Telegram api creates a grizzly http server, which writes the following when the bot starts:

Jul 28, 2018 3:27:59 PM org.glassfish.grizzly.http.server.NetworkListener start

INFO: Started listener bound to [localhost:443]

Jul 28, 2018 3:27:59 PM org.glassfish.grizzly.http.server.HttpServer start

INFO: [HttpServer] Started.

There are no more errors when starting the program. But in the server logs I saw the following error

2018/07/29 15:08:43 [error] 1166#1166: *453 openat() "/var/www/www-root/data/www/mydomain.net/callback/WebhookClass failed (2: No such file or directory),
 client: 149.154.167.227, server: mydomain.net request: 
"POST /callback/WebhookClass HTTP/1.1", host: "mydomain.net"

It looks like my post request can't be processed due to the wrong url to the webhook. But I don't understand what url should be specified, because the bot is going to a jar archive,
and the webhook processing class is in it. Please tell me.