title: Missing sequence or table: hibernate_sequence
body: <p>I am new to hibernate and postgres. Actually I am trying to map potgres database using Hibernate. This is my table stucture in postgresql</p>
  
  <pre><code>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 )
  )
  </code></pre>
  
  <p>I am trying to add a record to the database using the following code</p>
  
  <pre><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;
  }
  </code></pre>
  
  <p>When I execute the code I am getting the following error</p>
  
  <pre><code>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.&lt;clinit&gt;(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.&lt;init&gt;(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
  </code></pre>
  
  <p>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.</p>
  
  <p>Thanks in advance!</p>
  
  <p><strong>Added info</strong></p>
  
  <p>This is my employee class</p>
  
  <pre><code>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;
  }
  
  
  
  }
  </code></pre>