"Nothing found to display" error in display-tag

Question

Following is my code to display rows using display-tag in struts 1.3 but it always shows: Nothing found to display. I have checked ResultSet and ArrayList object, they all contain data.

<display:table export="true" id="data"
            name="sessionScope.MultipleStudentsDAO.studentList"
            requestURI="/mssrv.do" pagesize="5">

            <display:column property="rollNo" title="ROLL NO" sortable="true" />
            <display:column property="name" title="NAME" sortable="true" />
            <display:column property="branch" title="BRANCH" sortable="false" />

</display:table>

Answer 1

Using sessionScope.MultipleStudentsDAO.studentList in the name attribute, display:table will be looking in the session for an object called MultipleStudentsDAO and then calling its studentList property. For this to work you should be doing something like this in your Java code:

MultipleStudentsDAO yourVariableOfTypeMultipleStudentsDAO = ...
session.setAttribute("MultipleStudentsDAO", yourVariableOfTypeMultipleStudentsDAO);

Note that MultipleStudentsDAO is the name I have given the session attribute and not necessarily the name of the class (although they happen to be the same in this case to make your JSP code work).

As an aside, I would advise against storing an attribute in the session unless there is a particular reason why you need to - put it in the request instead, for example:

MultipleStudentsDAO multipleStudentDAO = ... 
request.setAttribute("studentDAO", multipleStudentDAO);

You then don't need to specify the scope in the tag and can just do this:

<display:table export="true" id="data"
        name="studentDAO.studentList"
        requestURI="/mssrv.do" pagesize="5">