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Problem in struts layout's datagrid.

 
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I am using a datagrid of struts layout in my JSP the code is :



I have a pojo (for hibernate) and in action form i just simply get/set the datagrid.

My action form is :


The getData operation from hibernate workes well and i am getting all the data from hibernate but when i try to insert data i got this error :



My pojo is:




Can someone suggest me what's wrong?
 
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