Error:(38, 25) java: cannot find symbol
  symbol:   method orElseThrow(()->new Re[...]+ id))
  location: class com.idemia.oauth.entity.Domain

public DomainDTO findById(Integer id) throws ResourceNotFoundException {



        Domain domain =
                domainRepository.findDomainById(id)
                        .orElseThrow(() -> new ResourceNotFoundException(" On finding domain does not exist on :: " + id)); // ** getting error in lamda expression **** //
        return domainMapper.toDomainDTO(domain);
    }

Domain domain =
            Optional.ofNullable(domainRepository.findDomainById(id))
        //  ^-----------------^
                    .orElseThrow(() -> new ResourceNotFoundException(" On finding domain does not exist on :: " + id));