Update problems with hibernate & struts

[Guoxue Zhang]

Hello Guys,
   
  When I update a record using Hibernate and Struts, I have to transfer primary 
key(type is LONG) to ModelUpdadteAction class  from update.jsp file. 
   
  In ModelUpdateAction.java file: 
   
  String v_id = request.getParameter("modelid");
  Long v_idLong = Long.valueOf( v_id);
  
  Models model = new Models();
  model.setModelId(v_idLong);
  model.setModelname("Update New record IN Models");
   
  ModelsDAO modeldao = new ModelsDAO();
  modeldao.update(model);
   
  I cann't update the record.  A error is: javax.servlet.ServletException: a 
different object with the same identifier value was already associated with the 
session:
   
  If I directly update with a primary key: 
   
  Long v_idLong = Long.valueOf( "55");
  
  Models model = new Models();
  model.setModelId(v_idLong);
  model.setModelname("Update New record IN Models");
   
  ModelsDAO modeldao = new ModelsDAO();
  modeldao.update(model);
   
  It is successful.
   
  Please reply that is what is problem and how to solv it. Thank you.
   
  Frank
   
   
   
   
  
  
 
   

 
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