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How to fetch OAuth2.0 Access Token and use this token to call RESTFul Web services using Java client code

I am new to write a Java client code to call RestFul web services. These web services using OAuth2.0 security. I have client-id and secret keys with me, but unable to call through Java program. How should I get access token out of this and use this token further for Web service API calls. I am using Java6 and struts framework.Any help is appreciated