How to annotate MYSQL autoincrement field with JPA annotations

Straight to the point, problem is saving the object Operator into MySQL DB. Prior to save, I try to select from this table and it works, so is connection to db.

Here is my Operator object:

@Entity
public class Operator{

   @Id
   @GeneratedValue
   private Long id;

   private String username;

   private String password;


   private Integer active;

   //Getters and setters...
}

To save I use JPA EntityManager’s persist method.

Here is some log:

Hibernate: insert into Operator (active, password, username, id) values (?, ?, ?, ?)
com.mysql.jdbc.JDBC4PreparedStatement@15724a0: insert into Operator (active,password, username, id) values (0, 'pass', 'user', ** NOT SPECIFIED **)

The way I see it, problem is configuration with auto increment but I can't figure out where.

Tried some tricks I've seen here: Hibernate not respecting MySQL auto_increment primary key field But nothing of that worked

If any other configuration files needed I will provide them.

DDL:

CREATE TABLE `operator` ( 
`id` INT(10) NOT NULL AUTO_INCREMENT,
`first_name` VARCHAR(40) NOT NULL,
`last_name` VARCHAR(40) NOT NULL,
`username` VARCHAR(50) NOT NULL,
`password` VARCHAR(50) NOT NULL,
`active` INT(1) NOT NULL,
PRIMARY KEY (`id`)
)