Resolved: Sonarqube how can fix nullpointeexception

  GeneratedKeyHolder generatedKeyHolder = new GeneratedKeyHolder();
        String sql = "Update users set enable=true where username=:username";
        SqlParameterSource paramSource = new MapSqlParameterSource().addValue("username", u.getUsername());
        namedParameterJdbcTemplate.update(sql, paramSource, generatedKeyHolder);
        try {
            return generatedKeyHolder.getKey().intValue();
A "NullPointerException" could be thrown; "getKey()" can return null.
        }
        catch (NullPointerException nl){
            return 0;
        }
    }

GeneratedKeyHolder generatedKeyHolder = new GeneratedKeyHolder();
    String sql = "Update users set enable=true where username=:username";
    SqlParameterSource paramSource = new MapSqlParameterSource().addValue("username", u.getUsername());
    namedParameterJdbcTemplate.update(sql, paramSource, generatedKeyHolder);
    try {
        Optional<Number> key = Optional.ofNullable(generatedKeyHolder.getKey());
        if(key.isEmpty())
            return null;
        else
            key.get().intValue();
    }
    catch (NullPointerException nl){
        return 0;
    }