Securing Restful Web Services with Spring Security and OAuth2 (Spring Security + OAuth2 + Spring Rest)

I am very new to Spring security and Spring OAuth . My requirement is to create a Java application with Spring security and Spring Oauth in the project. After searching on the internet I have found out this link http://www.beingjavaguys.com/2014/10/spring-security-oauth2-integration.html

I have few questions in it:

1)I have seen Spring security.xml and in that there is this code // please look at this code

<oauth:authorization-server
            client-details-service-ref="clientDetails" token-services-ref="tokenServices"
            user-approval-handler-ref="userApprovalHandler">
            <oauth:authorization-code />
            <oauth:implicit />
            <oauth:refresh-token />
            <oauth:client-credentials />
            <oauth:password />
        </oauth:authorization-server>

Do I need to a oAuth server running in my system and I need to give details for that server in these lines provided .

If yes which server I have to use , Is it a downloadable .exe file or just a depedency in maven will be fine to act as a server .

Please go through the example link I have given above and let me know If I import that project in my system and run it ,Shall I assume that I am running Application with Spring security and Outh application.

Please help me in giving as much as information on these concepts as I am new and stuck...