Messenger Bot that, based on typed text, query spring documentation and return 3 first results. Read this blog post for more details: https://aboullaite.me/my-first-java-bot/

First thing you need to do is to setup a Facebook app, Please follow this link for more details. You'll need also a free hosting service like Heroko or Clever Cloud, or you can simply use NGROK. and don't forget to create a Facebook page.

Once all done, follow this steps:

• open https://developers.facebook.com/apps click the 'Add a New App' button
• enter the Display Name, e.g. spring-bot select the Category: 'Apps for Messenger'
• click the 'Create App ID' button
• Section 'Token Generation': Select your created FB Page
• copy the 'Page Access Token' to the clipboard
• copy it to your application.yml
• navigate to 'Dashboard'
• copy the 'App Secret' to the clipboard
• copy it to your application.yml
• use a randomly generated string as 'Verify Token'
• deploy you app, and copy your public HTTPS URL (callback url)
• navigate back to 'Messenger'
• Section 'Webhooks': Click the 'Setup Webhooks' button
• past the Callback URL and your verify token
• select the following Subscription Fields: messages, messaging_postbacks, messaging_optins, message_deliveries, message_reads, message_echoes
• click the 'Verify and Save' button
• Section 'Webhooks': Select your created FB Page to subscribe your webhook to the page events
• click the 'Subscribe' button