ConfigurePrincipalExtractor.java

  @Autowired
  private PrincipalExtractor principalExtractor;

  private Filter ssoFilter() {
    OAuth2ClientAuthenticationProcessingFilter facebookFilter = new OAuth2ClientAuthenticationProcessingFilter("/login/facebook");
    OAuth2RestTemplate facebookTemplate = new OAuth2RestTemplate(facebook(), oauth2ClientContext);
    facebookFilter.setRestTemplate(facebookTemplate);
    UserInfoTokenServices tokenServices = new UserInfoTokenServices(facebookResource().getUserInfoUri(), facebook().getClientId());
    tokenServices.setRestTemplate(facebookTemplate);
    tokenServices.setPrincipalExtractor(principalExtractor);
    facebookFilter.setTokenServices(tokenServices);
    return facebookFilter;
  }