execption struts-layout

[dehbi marouane]

hello, i have a problem with an action-mapping in struts-layout.

the JSP that call this action use a Struts-layout TAG "DATAGRID" and when i submit a form i have this exception :

  
javax.servlet.ServletException: BeanUtils.populate 
   org.apache.struts.util.RequestUtils.populate(RequestUtils.java:495) 
   org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:805) 
   org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:203) 
   org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194) 
   org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432) 
   javax.servlet.http.HttpServlet.service(HttpServlet.java:709) 
   javax.servlet.http.HttpServlet.service(HttpServlet.java:802) 
 
 
cause m�re 
 
java.lang.NullPointerException 
   org.apache.commons.beanutils.BeanUtilsBean.setProperty(BeanUtilsBean.java:929) 
   org.apache.commons.beanutils.BeanUtilsBean.populate(BeanUtilsBean.java:811) 
   org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:298) 
   org.apache.struts.util.RequestUtils.populate(RequestUtils.java:493) 
   org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:805) 
   org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:203) 
   org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194) 
   org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432) 
   javax.servlet.http.HttpServlet.service(HttpServlet.java:709) 
   javax.servlet.http.HttpServlet.service(HttpServlet.java:802) 
 
 

thank u for responses!
[ March 22, 2006: Message edited by: dehbi marouane ]