@RestController
public class WebHookController {

    private final WebHookBot bot;

    public WebHookController(WebHookBot bot) {
        this.bot = bot;
    }

    @RequestMapping(value = "/", method = RequestMethod.POST)
    public BotApiMethod<?> onUpdateReceived(@RequestBody Update update) {
        return bot.onWebhookUpdateReceived(update);
    }
}

@Component
@FieldDefaults(level = AccessLevel.PRIVATE)
public class WebHookBot extends TelegramWebhookBot {

    @Getter
    @Value("${bot.username}")
    String botUsername;

    @Getter
    @Value("${bot.token}")
    String botToken;

    @Getter
    @Value("${bot.path}")
    String botPath;

    @Override
    public BotApiMethod <?> onWebhookUpdateReceived(Update update) {
        if (update.hasMessage() && update.getMessage().hasText()) {
            Long chatId = update.getMessage().getChatId();
            try {
                execute(new SendMessage(chatId, "Привет"));
            }
            catch (TelegramApiException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

}

bot.username=webhook_gp_bot
bot.token=1285409619:AAHhLD0f206MjQ2EZxVkos5XyqystfOcdYc
bot.path=https://webhook-bot-test.herokuapp.com/

https://api.telegram.org/bot{my_bot_token}/setWebhook?url=https://webhook-bot-test.herokuapp.com/

Building jar: /tmp/build_4ffcfa4a31fcaeb4cb1a372ee2af3f63/target/webhook_bot-1.0-SNAPSHOT.jar

web java -Dserver.port=$PORT $JAVA_OPTS -jar target/webhook_bot-1.0-SNAPSHOT.jar