What is the Java annotation in Hibernate used to auto increment a MySQL Primary Key - @Id

Although you could use GenerationType.AUTO, it's not a very good idea for MySQL and Hibernate 5 because it will default to the TABLE generator which is bad for performance.

So, although [it will disable JDBC batch inserts][3], you should use IDENTITY:

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;

or you can use native identifier generator which falls back to IDENTITY on MySQL:

@Id
@GeneratedValue(
    strategy= GenerationType.AUTO, 
    generator="native"
)
@GenericGenerator(
    name = "native", 
    strategy = "native"
)
private Long id;

try to use @GeneratedValue(strategy = GenerationType.IDENTITY)

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;

take a look in this doc about Auto Generated Values