select Id returns null

[target]

Hello,
I am using postgresql, and spring jdbc, and when I tried to execute a select query :

 
 private SimpleJdbcTemplate template;
List<User> res = template.query("select * from user where id=?", MAPPER, id);

I don't know why the returned id is null, I'd like to add that the id is of type BIGSERIAL in postgresql, and I get it as Long in java.
do you have an idea? is this problem related ot spring query?
Regards

[target]

Hello,
no idea about that?
in fact, the id is Long in java corner, should I specify some thing else to spring to bind the Long to BIGSERIAL, , I'd like to add that I face this problem only with select query, but when I have an instance of user and I try to get the id by;user.getId(), I get it successfully!
I hope some one could help me!
Regards