package com.github.xabgesagtx.bots;

import java.util.ArrayList;
import java.util.List;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.context.annotation.Configuration;
import org.telegram.telegrambots.ApiContextInitializer;
import org.telegram.telegrambots.TelegramBotsApi;
import org.telegram.telegrambots.bots.TelegramLongPollingBot;
import org.telegram.telegrambots.bots.TelegramWebhookBot;
import org.telegram.telegrambots.exceptions.TelegramApiException;
import org.telegram.telegrambots.generics.BotSession;

@Configuration
@ConditionalOnBean({TelegramLongPollingBot.class, TelegramWebhookBot.class})
public class TelegramBotAutoConfiguration {

	private final Logger logger = LoggerFactory.getLogger(TelegramBotAutoConfiguration.class);
	
	private List<BotSession> sessions = new ArrayList<>();
	
	@Autowired(required=false)
	private List<TelegramLongPollingBot> pollingBots = new ArrayList<>();
	
	@Autowired(required=false)
	private List<TelegramWebhookBot> webHookBots = new ArrayList<>();
	
	static {
		ApiContextInitializer.init();
	}
	
	@PostConstruct
	public void start() {
		logger.info("Starting auto config for telegram bots");
		TelegramBotsApi api = new TelegramBotsApi();
		pollingBots.stream().forEach(bot -> {
			try {
				logger.info("Registering polling bot: {}", bot.getBotUsername());
				sessions.add(api.registerBot(bot));
			} catch (TelegramApiException e) {
				logger.error("Failed to register bot {} due to error {}", bot.getBotUsername(), e.getMessage());
			}			
		});
		webHookBots.stream().forEach(bot -> {
			try {
				logger.info("Registering web hook bot: {}", bot.getBotUsername());
				api.registerBot(bot);
			} catch (TelegramApiException e) {
				logger.error("Failed to register bot {} due to error {}", bot.getBotUsername(), e.getMessage());
			}			
		});
	}
	
	@PreDestroy
	public void stop() {
		sessions.stream().forEach(session -> {
			if (session != null) {
				session.stop();
			}	
		});
	}
	
}

package com.github.xabgesagtx.bots;

import java.util.ArrayList;
import java.util.List;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.context.annotation.Configuration;
import org.telegram.telegrambots.ApiContextInitializer;
import org.telegram.telegrambots.TelegramBotsApi;
import org.telegram.telegrambots.bots.TelegramLongPollingBot;
import org.telegram.telegrambots.bots.TelegramWebhookBot;
import org.telegram.telegrambots.exceptions.TelegramApiException;
import org.telegram.telegrambots.generics.BotSession;

@Configuration
@ConditionalOnBean({TelegramLongPollingBot.class, TelegramWebhookBot.class})
public class TelegramBotAutoConfiguration {

	private final Logger logger = LoggerFactory.getLogger(TelegramBotAutoConfiguration.class);
	
	private List<BotSession> sessions = new ArrayList<>();
	
	@Autowired(required=false)
	private List<TelegramLongPollingBot> pollingBots = new ArrayList<>();
	
	@Autowired(required=false)
	private List<TelegramWebhookBot> webHookBots = new ArrayList<>();
	
	static {
		ApiContextInitializer.init();
	}
	
	@PostConstruct
	public void start() {
		logger.info("Starting auto config for telegram bots");
		TelegramBotsApi api = new TelegramBotsApi();
		pollingBots.forEach(bot -> {
			try {
				logger.info("Registering polling bot: {}", bot.getBotUsername());
				sessions.add(api.registerBot(bot));
			} catch (TelegramApiException e) {
				logger.error("Failed to register bot {} due to error {}", bot.getBotUsername(), e.getMessage());
			}			
		});
		webHookBots.forEach(bot -> {
			try {
				logger.info("Registering web hook bot: {}", bot.getBotUsername());
				api.registerBot(bot);
			} catch (TelegramApiException e) {
				logger.error("Failed to register bot {} due to error {}", bot.getBotUsername(), e.getMessage());
			}			
		});
	}
	
	@PreDestroy
	public void stop() {
		sessions.stream().forEach(session -> {
			if (session != null) {
				session.stop();
			}	
		});
	}
	
}

Remove useless stream() creation