Mysql – Spring @GeneratedValue annotations not working for Auto increment field

I use Scaffolding in MyEclipse to generate Web Application project, using spring MVC and MySQL database. Please give me some clues to solve problem bellow.

I get problem with id primary key. It doesn't auto increment event if i use:
@GeneratedValue(strategy=GenerationType.IDENTITY)
@GeneratedValue(strategy=GenerationType.AUTO)
@GeneratedValue(strategy=GenerationType.SEQUENCE)
@GeneratedValue(strategy=GenerationType.TABLE)

I have several tables with the primary key set to AUTO_INCREMENT. Like this example:

CREATE TABLE IF NOT EXISTS `ehealthdb`.`timestamp` (
  `id` BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT '',
  `login_date` DATETIME NULL COMMENT '',
  `logout_date` DATETIME NULL COMMENT '',
  `create_date` DATETIME NOT NULL COMMENT '',
  `update_date` DATETIME NULL COMMENT '',
  `isActive` TINYINT(1) NULL COMMENT '',
  PRIMARY KEY (`id`)  COMMENT '')
ENGINE = InnoDB;

When I try to use the save using the generated post URL and the following json payload:

{
 "loginDate":"1374839856000",
 "logoutDate":"1374839856000",
 "createDate":"1374839856000",
 "updateDate":"1374839856000",
 "isActive":true
}

Request processing failed; nested exception is javax.persistence.PersistenceException:
org.hibernate.id.IdentifierGenerationException: ids for this class
must be manually assigned before calling save():
ehealth.domain.Timestamp

I think this is caused by a missing @GeneratedValue, which scaffolding has not created on my primary keys. I had to add it in manually like below:

But It's still not work. It's still get error.

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY) //add this 
@Column(name = "id", unique = true, nullable = false)
@Basic(fetch = FetchType.EAGER)

@XmlElement
Integer id;