Exception jsp/servlet

ma page jsp m'affiche ceci:

[ServletException inpages/partSourceSearch.jsp] /pages/partSourceSearch.jsp'

le code de ma page est :


<%@ taglib uri="/tags/struts-html" prefix="html" %>
<%@ taglib uri="/tags/struts-bean" prefix="bean" %>
<%@ taglib uri="/tags/struts-logic" prefix="logic" %>

<%@ page import="forms.PartSourceForm" %>
<%@ page import="action.GenericAction" %>
<%@ page import="fwk.Constant" %>

<%@ include file="/pages/applicationHeader.jsp" %>

<beanefine id="paginationKey"
value='<%= GenericAction.guessEntityName("actions.PartSourceListAction" ) %>' />
<beanefine id="actionListPath" value='/partSourceList' />
<beanefine id="actionDetailPath" value='/partSourceDetail' />
<h3>debut</h3>
<!-- Action button Table -->
<html:form action="<%= actionListPath %>" method="GET">

<table class="transparent" border="0" align=center cellspacing="0" width="80%">
<tr>
<td align="left" class="transparent" valign="top">
<table>
<tr>
<td><h3>toto</h3>
<html:link styleClass="button" page='<%= actionDetailPath+".do?operation=create" %>'>
<bean:message key="lbl.create"/><h3>titi</h3>
</html:link>
</td>
</tr>
</table>
</td>
<td align="right" valign="top">
<table>
<tr>
<td><bean:message key="lbl.goto" /></td>
<td><input type="hidden" name="action"
value="<bean:write name="<%= paginationKey %>" property="actionGoto" />" />
<input type="hidden" name="operation" value="list" />
<html:text name="<%= paginationKey %>" property="startRcdId" />
</tr>
</table>
</td>
</tr>
</table>

</html:form>
<h3>lulu</h3>
<logicresent name="partSourceList" property="voList">

<table class="liste" border="0" align=center cellspacing="0" width="80%">

<tr>
<th class="liste">Code</th>
<th class="liste">Description</th>
<th class="liste">Fabricant</th>
<th class="liste">Version</th>
<tr>
<%
String lig = null;
int i=0;
%>
<logic:iterate id="element" name="partSourceList" property="voList">
<%
if ( i % 2 > 0 ) { lig = "listepair"; } else { lig = "listeimpair"; }
i++;
%>
<tr>
<td class="<%= lig %>"><html:link
page='<%= actionDetailPath+".do?operation=view" %>' paramId="code"
paramName="element" paramProperty="code">
<bean:write name="element" property="code" />
</html:link></td>
<td class="<%= lig %>"><bean:write name="element"
property="description" /></td>
<td class="<%= lig %>"><bean:write name="element"
property="fabricant" /></td>
<td class="<%= lig %>"><bean:write name="element" property="version" /></td>
</tr>
</logic:iterate>
</table>
<h3>fin</h3>
</logicresent>