This project is an application for a Facebook Messenger OpenAI Bot using Java, Spring Boot, and messenger4j. You can use it to quickly bootstrap your ChatBot projects and write your first Messenger ChatBot within minutes.

It's a pre-configured Maven project containing a sample chatbot application and all required dependencies.

The sample application is a port of the official Messenger Platform NodeJS Showcase. For information on how to setup your chatbot you can follow along with the Setup Guide.

• Git
• JDK 8 or later
• Maven 3.0 or later

In order to get your chatbot working you have to provide the following settings:

messenger4j.appSecret = ${MESSENGER_APP_SECRET}
messenger4j.verifyToken = ${MESSENGER_VERIFY_TOKEN}
messenger4j.pageAccessToken = ${MESSENGER_PAGE_ACCESS_TOKEN}

The configuration is located in src/resources/application.properties.

With the default configuration you can provide these values through the environment variables MESSENGER_APP_SECRET, MESSENGER_VERIFY_TOKEN, and MESSENGER_PAGE_ACCESS_TOKEN.

You can run the application from the command line using:

mvn spring-boot:run

Or you can build a single executable JAR file that contains all the necessary dependencies, classes, and resources with:

mvn clean package

Then you can run the JAR file with:

java -jar target/*.jar

Instead of mvn you can also use the maven-wrapper ./mvnw to ensure you have everything necessary to run the Maven build.

1. enter the generated Verify Token, e.g. retgdkfjsjklsklj34qdfs
2. select the following Subscription Fields: messages, messaging_postbacks, messaging_optins, message_deliveries, message_reads, messaging_account_linking, message_echoes
3. click the 'Verify and Save' button
4. Section 'Webhooks': Select your created FB Page to subscribe your webhook to the page events, e.g. Messenger4j Demo
5. click the 'Subscribe' button

1. open https://www.messenger.com
2. search for your Chatbot using the name of your created FB Page, e.g. The Bear
3. send a message, e.g. Hello Chatbot.

This project is licensed under the terms of the MIT license.