Hi i am tring to examin behaviour of save and persist without any explicit transaction.My code is:-

public static void main(String[] args) {
/*Employee emp = new Employee();
emp.setName("Pankaj1");
emp.setRole("CEO");
emp.setInsertTime(new Date());*/

//Get Session
Session session = HibernateUtil.getSessionFactory().openSession();
//start transaction
//session.beginTransaction();
//Save the Model object
Employee emp = (Employee) session.get(Employee.class, 1);
emp.setName("XYZ2");
session.save(emp);
// session.persist(emp);
//Commit transaction
//session.getTransaction().commit();
System.out.println("Employee ID=" + emp.getId());
session.flush();

}

But i am getting the below exception,

Exception in thread "main" org.hibernate.exception.GenericJDBCException: Could not execute JDBC batch update
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:253)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:235)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:140)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
at com.sd.hibernate.main.HibernateMain.main(HibernateMain.java:32)
Caused by: java.sql.BatchUpdateException: Lock wait timeout exceeded; try restarting transaction
at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1213)
at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:912)
at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:48)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:246)
... 6 more

SomeOne please explain....! i am using Hibernate 3.2.3 ga