jsp页面到action出现StackOverflowError

先粘代码action里
public class EmployeeAction extends DispatchAction

public ActionForward queryAll(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {
List list = employeeService.queryAll();
request.setAttribute("list",list);
return mapping.findForward("list");
}

public ActionForward queryById(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)throws Exception {         
System.out.println("11111111111111");
return mapping.findForward("success");
}

public ActionForward delete(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)throws Exception {
System.out.println("22222222222222");
return mapping.findForward("success");
}

list页面
<c:forEach items="${requestScope.list}" var="employee">
    <tr>
        <td align="center"> <c:out value="${employee.id}"> </c:out> </td>
        <td align="center"> <c:out value="${employee.name}"> </c:out> </td>
<td align="