java chatbot does not work on facebook messenger webhook

Asked Apr 19 '17 at 01:58

Active Apr 19 '17 at 05:46

Viewed 373 times

we followed this link(https://github.com/thekosmix/Java-FbChatBot) to build a java chatbot, when we try it on webhook of messenger , we hit the following error: The URL couldn't be validated. Response does not match challenge, expected value="1211923363", received="" our webhook is: https://41ab4ddb.ngrok.io/bot/webhook?hub.verify_token=nhitoken&hub.challenge=123456

edited Apr 19 '17 at 05:46

asked Apr 19 '17 at 01:58

it worked by this url: https://41ab4ddb.ngrok.io/bot/webhook?hub.verify_token=whatever_string_you_or_your_friends_wish&hub.challenge=joeyang – Apr 19 '17 at 06:40
unfortunately, webhook is ok on FB, but we saw some errors on 9090 console: [INFO] Starting scanner at interval of 10 seconds. webhook servlet created!! java.io.IOException: Server returned HTTP response code: 400 for URL: https://graph.facebook.com/v2.6/1815549365137695?access_token=YOUR_FB_PAGE_TOKEN [ERROR] /bot/webhook java.lang.NullPointerException at in.strollup.fb.utils.FbChatHelper.getReplies(FbChatHelper.java:117) – Apr 19 '17 at 17:07

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