Bearer

import org.apache.cxf.rs.security.oauth2.common.AccessTokenRegistration; 
import org.apache.cxf.rs.security.oauth2.common.ServerAccessToken; 
import org.apache.cxf.rs.security.oauth2.tokens.bearer.BearerAccessToken; 

public class CustomOAuthDataProvider implements AuthorizationCodeDataProvider { 

   public ServerAccessToken createAccessToken(AccessTokenRegistration reg) 
      throws OAuthServiceException { 

      ServerAccessToken token = new BearerAccessToken(reg.getClient(), 3600L); 

      List<String> scope = reg.getApprovedScope().isEmpty() ? 
         reg.getRequestedScope() : reg.getApprovedScope(); 
      token.setScopes(convertScopeToPermissions(reg.getClient(), scope)); 
      token.setSubject(reg.getSubject()); 
      token.setGrantType(reg.getGrantType()); 

      // persist as needed and then return 

      return token; 
   } 
   // other methods not shown
}