User authentication via Facebook & OAuth2 (without password) using Spring Security

A SpringBoot application that uses OAuth2 to authenticate users via their Facebook accound instead of specifying a password

##Instructions to run the application:

1. Make sure you have a MySQL server running.
2. Run the command gradle bootRun while in the root folder.
3. After application startup, navigate to http://localhost:8080.
4. A web page displaying "Login via Facebook" and buttons for other calls to server will be loaded.
5. The button "Hello" corresponding to the server side call /hello is accessible to all.
6. The call /hello/secure and /me represented by "Hello Secure" and "Me" buttons respectively require a valid access token.
7. You can check the behaviour of the calls before and after Logging in via Facebook.