PreInsert and PreUpdate Event Listener in hibernate

Question

I have used PreInsertEventListener and PreUpdateEventListener Event Listener to insert created date and updated date in table.
The problem i am fac

Answer 1

Do like this

public class PreInsertListener implements PreInsertEventListener,  
                                          PreUpdateEventListener 
{
    @Override
    public boolean onPreInsert(PreInsertEvent arg0) {
        if(arg0.getEntity() instanceof City){
            City city = (City)arg0.getEntity();
            city.setCreated_date(new Date());               
        }
        return false;
    }

    @Override
    public boolean onPreUpdate(PreUpdateEvent arg0) {
         if(arg0.getEntity() instanceof City){
            City city = (City)arg0.getEntity();
            city.setCreated_date(new Date());                
        }
        return false;
    }
}