/**
* @hibernate.class
*   table = "client"
*/
public class Client{
  [b]private int id = -1[/b];
  private String name;
 
  /**
   * @hibernate.property
   */
  public String getName() {
    return name;
  }
 
  public void setName(String model) {
    this.model = model;
  }
 
 
  /**
   * @hibernate.id
   *   generator-class = "increment"
   *   [b]unsaved-value = "-1"[/b]
   */
  public int getId() {
    return id;
  }
 
  public void setId(int id) {
    this.id = id;
  }
}

session.flush(); // flush changes into the database

session.evict(yourObject); // remove the object from the session cache
//or
session.clear(); // clear the full session cache

// and then
session.saveOrUpdate(yourObject);