select Id returns null

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

Code:

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

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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

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