Re: DisplayTag Library Question

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <>
Tue, 06 Oct 2009 21:56:22 -0400
Mongoose wrote:

On Oct 5, 8:03 pm, Daniel Pitts
<> wrote:

Arne Vajh?j wrote:

Mongoose wrote:

Hi All,
For some reason I'm having trouble with displaying my list data with
the DisplayTag Library . . . I'm new to Struts (and the
DisplayTagLibrary) so hopefully it's something simple . . .
In my implementation class I have a method that uses Hibernate to get
some data from an Oracle Database. The List (in this case called
"results") is returned to the caller . . . which is a Struts Action.
The first part of this file is shown below as well . . .
public List getDefects( ) throws DatastoreException
   List results = null;
   List items = null;
   Session session = null;
         session = sessionFactory.openSession( );
         Query q = session.createQuery("select DefectID, Description,
PriorityID from Defect");
         results = q.list( );
         session.close( );
         }catch( Exception ex ){
         ex.printStackTrace( );
         throw DatastoreException.datastoreError(ex);
         return results;
public class TestAction extends Action
    public TestAction()
    public ActionForward execute (ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws
        ActionErrors errors = new ActionErrors();
        ActionForward forward = new ActionForward();
        // return value
        //SubmitForm submitForm = (SubmitForm) form;
            System.out.println("Go Away");
             EricEnhancementServiceImpl E = new
             List results = E.getDefects();
             for (ListIterator iter = results.listIterator();
() ; )
                 Object[] row = (Object[]);
                 Integer id = (Integer)row[0];
                 String desc = (String)row[1];
                 Integer priorityid = (Integer)row[2];
             request.setAttribute("stuff", results);
As you can see in the action the "results" list is stored in
session . . .
The .jsp where I'm just trying to display the results of the data that
is in my list is shown below:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><%@page
    language="java" contentType="text/html; charset=ISO-8859-1"
<%@taglib uri="" prefix="html"%>
<%@taglib uri="" prefix="bean"%>
<%@ taglib uri="" prefix="display" %>
<%@ taglib uri="" prefix="displayel" %>
<meta http-equiv="Content-Type" content="text/html;
    <jsp:include page="strutsmenu.jsp"/>
    <display:table name="stuff"/>
When I try to execute the Struts application I get the memory location
printed instead of the data (like this). As far as I know all .jar
file and .tld files are present.
Can someone please tell me what I'm doing wrong . . .

Maybe your Defect class should have a toString method.

Even worse than that, the ooutput suggests an "Object[]" instance is the
actual object being printed. Perhaps dispaytag's documentation would
illuminate the proper usage.

You may have to transform your Object[] rows into actual Strings,
Objects, or (ick) Maps.

Hmmm, still haven't quite been able to overcome this issue . . . I
definitely have an ArrayList of Objects. Each object is an
instantiation of the class below:

public class Defect extends ActionForm

    private Integer DefectID;
    private String Description;
    private Integer PriorityID;

    public Integer getDefectID()
        return DefectID;

    public void setDefectID(Integer defectID)
        DefectID = defectID;

    public String getDescription()
        return Description;

    public void setDescription(String description)
        Description = description;

    public Integer getPriorityID()
        return PriorityID;

    public void setPriorityID(Integer priorityID)
        PriorityID = priorityID;


So I have an arraylist of Defect Objects. However, when I try to
execute the following code in the .jsp

<display:table name="Defects" class="displaytable">
   <display:column property="Description" />

I get: javax.servlet.ServletException:
javax.servlet.jsp.JspException: Error looking up property
"Description" in object type blah blah blah. And I know there is a
getDescription in there so I'm not sure here . . . still trying to
determine what I'm doing wrong . . .

1) I don't think it is good to have the DAL-BLL DTO's extend
    extend ActionForm that is PL-CL thingy.

2) I strongly suspect that the problem is:

Query q = session.createQuery("select DefectID, Description, PriorityID
from Defect");


List results = session.createQuery("FROM Defect").list();


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