Missing sequence or table: hibernate_sequence

Question

I am new to hibernate and postgres. Actually I am trying to map potgres database using Hibernate. This is my table stucture in postgresql

CREATE TABLE employee ( id serial NOT NULL, firstname character varying(20), lastname character varying(20), birth_date date, cell_phone character varying(15), CONSTRAINT employee_pkey PRIMARY KEY (id ) ) 

I am trying to add a record to the database using the following code

 System.out.println("******* WRITE *******");     Employee empl = new Employee("Jack", "Bauer", new Date(System.currentTimeMillis()), "911");     empl = save(empl);     //This is the save function      private static Employee save(Employee employee) {     SessionFactory sf = HibernateUtil.getSessionFactory();     Session session = sf.openSession();      session.beginTransaction();       int id = (Integer) session.save(employee);     employee.setId(id);      session.getTransaction().commit();      session.close();      return employee; } 

When I execute the code I am getting the following error

org.hibernate.HibernateException: Missing sequence or table: hibernate_sequence Exception in thread "main" java.lang.ExceptionInInitializerError at org.tcs.com.Hibernate.HibernateUtil.buildSessionFactory(HibernateUtil.java:18) at org.tcs.com.Hibernate.HibernateUtil.<clinit>(HibernateUtil.java:8) at org.tcs.com.Hibernate.MainApp.list(MainApp.java:51) at org.tcs.com.Hibernate.MainApp.main(MainApp.java:17) Caused by: org.hibernate.HibernateException: Missing sequence or table: hibernate_sequence at org.hibernate.cfg.Configuration.validateSchema(Configuration.java:1282) at org.hibernate.tool.hbm2ddl.SchemaValidator.validate(SchemaValidator.java:155) at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:498) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1740) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1778) at org.tcs.com.Hibernate.HibernateUtil.buildSessionFactory(HibernateUtil.java:15) ... 3 more 

I have the sequence called "employee_id_seq" in my database. But I dont know why the database is looking for hibernate_seq. Could someone explain the error and the reason.

Thanks in advance!

Added info

This is my employee class

import java.sql.Date;  public class Employee {  private int id;  private String firstname;  private String lastname;  private Date birthDate;  private String cellphone;  public Employee() {  }  public Employee(String firstname, String lastname, Date birthdate, String phone) {     this.firstname = firstname;     this.lastname = lastname;     this.birthDate = birthdate;     this.cellphone = phone;  }  public int getId() {     return id; }  public void setId(int id) {     this.id = id; }  public String getFirstname() {     return firstname; }  public void setFirstname(String firstname) {     this.firstname = firstname; }  public String getLastname() {     return lastname; }  public void setLastname(String lastname) {     this.lastname = lastname; }  public Date getBirthDate() {     return birthDate; }  public void setBirthDate(Date birthDate) {     this.birthDate = birthDate; }  public String getCellphone() {     return cellphone; }  public void setCellphone(String cellphone) {     this.cellphone = cellphone; }    } 

Answer 1

In your domain or Model object annotate the id field as below and it should work. For me the GenerationType.AUTO failed

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