gistfile1.txt

public Pojo parseJson(String json) {
    // parse 
    return pojo;
    // don't catch the exception. If there is an exception, there is a bug, so you shouldn't catch it and ignore it
    // that will only cause a cryptic NullPointerException later.
}

public Mono<Pojo> query(long id) {

    Integer value = idMapper.getValue(id);
    
    if (value != null) {
        return repo.query(value).map(this::parse);
    }
    return Mono.error(() -> new NotFoundException("No Pojo with ID could be found"))
}