How to use Spring Security to develop a REST-service secured with OAuth2, Bitbucket authorization server and JWT

We are going to develop a small REST-service secured using OAuth2 protocol with Bitbucket as an authorization server. At first it may seem unusual to use a third-party authorization server, but imagine that you are developing a CI (Continuous Integration) server and would like to have access to the user’s resources (e.g projects, repositories) in a version control system. For example, the same approach is used in Drone.io  and Travis CI .

Theory

Implementation

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