apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/spi/oidc/OidcLocalUserServiceImpl.java/OidcLocalUserServiceImpl/findByUserId
class OidcLocalUserServiceImpl:  @Override
  public UserInfo findByUserId(String userId) {
    UserPO userPO = userRepository.findByUsername(userId);
    return userPO == null ? null : userPO.toUserInfo();
  }