Well, I should correct myself before others can understand my statements - I do use
the XML representation of the dropdown list. The items in the dropdown list will be
seen on the user screen and the user can pick an item from the dropdown list. I am
sorry my previous communication was confusing at the best.
Thanks
Velusamy K. Velu
(614) 728-0017
>>> [EMAIL PROTECTED] 11/03/04 09:40AM >>>
I am not sure if I understand what you mean. But to be sure I communicate the problem
- I do not XML representation of the dropdown list. This will be show on the user
screen and user will select an item from the dropdown list.
Thanks
Velusamy K. Velu
(614) 728-0017
>>> [EMAIL PROTECTED] 11/03/04 09:22AM >>>
Hello,
Can't you instead generate your castor object straight from
What the database has returned to you?
Is there any particular reason of why you have to go t hru a
Dropdownlist
If you don't use it afterwards?
Regards
marco
-----Original Message-----
From: Velusamy Velu [mailto:[EMAIL PROTECTED]
Sent: 03 November 2004 14:01
To: [EMAIL PROTECTED]
Subject: Re: [castor-user] Marshaling issue
Yes, I could. To isolate the problem I implemented a simple
functionality. There is just one button in the HTML. When it is
clicked the request goes to the TestAction class. The execute method of
the TestAction instantiates the Test class and calls the getStatuses
method. The Test class makes a call to an utility class to get a list
of statuses of vehicles. This list contains only 4 items. However, the
after marshaling it shows locations, makes, models, besides statuses. I
verified that everything is alright until marshaled. After making a
call to marshaller.marshall(object) the contents of vehicleReference is
changed.
Please let me know if you need additional info.
Thanks for looking into this problem.
Here is the action class --
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.jdom.Document;
import us.oh.state.epa.common.err.AppException;
import us.oh.state.epa.common.util.Logger;
import us.oh.state.epa.common.util.XMLHelper;
import us.oh.state.epa.motorpool.business.Test;
import us.oh.state.epa.motorpool.business.VehicleReference;
import us.oh.state.epa.motorpool.form.TestForm;
import com.oroad.stxx.action.Action;
/**
* Test action class.
*/
public class TestAction extends Action
{
/**
* Handle requests from the vehicle screen.
*
* @see
org.apache.struts.action.Action#execute(org.apache.struts.action.ActionM
apping,
* org.apache.struts.action.ActionForm,
* javax.servlet.http.HttpServletRequest,
* javax.servlet.http.HttpServletResponse)
*/
public ActionForward execute(ActionMapping actionMapping,
ActionForm actionForm, HttpServletRequest
httpServletRequest,
HttpServletResponse response) throws Exception
{
Logger.entering();
Document document = null;
ActionForward actionForward =
actionMapping.findForward("success");
TestForm form = (TestForm) actionForm;
int selectedStatusIndex = form.getSelectedStatusIndex();
try
{
VehicleReference vehicleReference = new VehicleReference();
Test test = new Test();
vehicleReference = test.getStatuses(); // 4 statuses
expected
vehicleReference.changeSelectedStatus(selectedStatusIndex);
document = XMLHelper.convertToXMLDocument(vehicleReference);
}
catch (AppException e)
{
Logger.throwing(e);
document = e.toXML();
actionForward = actionMapping.findForward("error");
}
saveDocument(httpServletRequest, document);
Logger.exiting();
return actionForward;
}
}
the minimalized biz logic --
package us.oh.state.epa.motorpool.business;
import us.oh.state.epa.common.err.AppException;
import us.oh.state.epa.common.web.DropdownList;
import us.oh.state.epa.motorpool.data.UpdateInsertDataHandler;
/**
* Test class to isolate the problem with Castor.
*/
public class Test
{
/**
* Retrieve a list of statuses from the database.
*
* @return VehicleReference
* @throws AppException
*/
public VehicleReference getStatuses() throws AppException
{
VehicleReference vehicleReference = new VehicleReference();
DropdownList dropdownList = null;
UpdateInsertDataHandler dataHandler = new
UpdateInsertDataHandler();
dropdownList = dataHandler.getStatus();
vehicleReference.setStatuses(dropdownList);
return vehicleReference;
}
}
data handler
package us.oh.state.epa.motorpool.data;
import java.util.Hashtable;
import us.oh.state.epa.common.data.PortableResultSet;
import us.oh.state.epa.common.data.QueryEngine;
import us.oh.state.epa.common.err.AppException;
import us.oh.state.epa.common.util.Logger;
import us.oh.state.epa.common.util.Selectable;
import us.oh.state.epa.common.web.DropdownList;
import us.oh.state.epa.motorpool.Constants;
/**
* Enter comments to describe this class
*/
public class UpdateInsertDataHandler
{
public DropdownList getStatus() throws AppException
{
Logger.entering();
final String QUERY_STRING = "SELECT DISTINCT DESCRIPTION,
STATUS_ID "
+ "from motorpool.status " + "where category ='VEHICLE'
";
QueryEngine queryEngine = new
QueryEngine(Constants.MOTORPOOL_DATABASE);
PortableResultSet portableResultSet = queryEngine.executeQuery(
QUERY_STRING, null);
DropdownList descriptionList = new DropdownList();
Selectable selectable = null;
while (portableResultSet.next())
{
selectable = new Selectable();
String description =
portableResultSet.getString("DESCRIPTION");
String statusID = portableResultSet.getString("STATUS_ID");
selectable.setItem(description);
selectable.setValue(statusID);
descriptionList.addSelectable(selectable);
}
Logger.exiting();
return descriptionList;
}
}
Thanks
Velusamy K. Velu
(614) 728-0017
>>> [EMAIL PROTECTED] 11/03/04 08:28AM >>>
Hello there,
Can you post your code?
>From where are you marshalling and unmarshalling? Are you creating
brand new objects or are you marshalling from existing one?
Regards
marco
-----Original Message-----
From: Velusamy Velu [mailto:[EMAIL PROTECTED]
Sent: 02 November 2004 18:35
To: [EMAIL PROTECTED]
Subject: Re: [castor-user] Marshaling issue
Well, I am not even saving the old XML in a file. It is used by STxx
and thrown away. I also followed the suggestion made by Tim. Tim
suggested that I close the stream to which the XML string was written.
The problem still occurs.
The source of the problem appears to be the marshaling process changing
the state of the object it marshals. Or, inside the marshal(object)
method an old, stale, cached version of the object is used. To my
amazement I am not sure where, how, when, and which process does the
caching. If I know that I will turn off the caching. Without knowing
that specific information it is not possible to solve this problem.
Below is the expected XML --
<vehicle-reference index="0">
<statuses index="0">
<item>AVAILABLE</item>
<value>5</value>
</statuses>
<statuses index="1">
<item>INUSE</item>
<value>4</value>
<selected>YES</selected>
</statuses>
<statuses index="2">
<item>OUTFORMAINTENANCE</item>
<value>6</value>
</statuses>
<statuses index="3">
<item>SALVAGED</item>
<value>7</value>
</statuses>
</vehicle-reference>
However, I get -
<vehicle-reference index="0">
<locations index="0">
<item>CDO </item>
</locations>
<locations index="1">
<item>CO </item>
</locations>
<types index="0">
<item>VAN</item>
</types>
<types index="0">
<item>SUV</item>
</types>
<statuses index="0">
<item>AVAILABLE</item>
<value>5</value>
</statuses>
<statuses index="1">
<item>INUSE</item>
<value>4</value>
</statuses>
<statuses index="2">
<item>OUTFORMAINTENANCE</item>
<value>6</value>
</statuses>
<statuses index="3">
<item>SALVAGED</item>
<value>7</value>
</statuses>
<models index="0">
<item>ASTRO</item>
</models>
<models index="0">
<item>C-2500</item>
</models>
<makes index="0">
<item>CHEV</item>
</makes>
<makes index="0">
<item>FORD</item>
</makes>
</vehicle-reference>
that's wrong.
Thanks
Velusamy K. Velu
(614) 728-0017
>>> [EMAIL PROTECTED] 11/02/04 12:27PM >>>
I haven't used the xml side of castor greatly, but have you tried
deleting the old xml file, and then marshaling the object again? I
know its kinda a shot in the dark, but since you said the first
marshal worked fine its worth a shot.
On Tue, 02 Nov 2004 11:07:46 -0500, Velusamy Velu
<[EMAIL PROTECTED]> wrote:
> Hello:
>
> I am continuing to investigate this problem and found the following
additional information -
>
> The type of the object to be marshaled is VehicleReference
> public class VehicleReference extends Selectable
> {
> private ArrayList types = null;
> private ArrayList models = null;
> private ArrayList makes = null;
> private DropdownList statuses = null;
> private DropdownList locations = null;
> private String license = null;
> ...
> }
> To isolate and repeat the problem only the statuses is populated. All
other attributes left in null state. The statuses is of type
DropdownList which extends the java.util.ArrayList and adds a couple of
more functionalities.
>
> In debug mode while stepping through the code the object (an instance
of VehicleReference) is good until the marshaller.marshall(object)
method is called.
>
> state of the object before calling -
> public class VehicleReference extends Selectable
> {
> private ArrayList types = null;
> private ArrayList models = null;
> private ArrayList makes = null;
> private DropdownList statuses = DropdowList (id=305)
> private DropdownList locations = null;
> private String license = null;
> ...
> }
>
> state of the object after that call
> public class VehicleReference extends Selectable
> {
> private ArrayList types = DropdowList (id=306)
> private ArrayList models = DropdowList (id=304)
> private ArrayList makes = DropdowList (id=303)
> private DropdownList statuses = DropdowList (id=305)
> private DropdownList locations = DropdowList (id=302)
> private String license = null;
> ...
> }
>
> The values assigned during the marshaling process to types, models,
makes, and locations are all from a previous run (about 3 days old) of
the program. All of those values are accurate values but not wanted
now.
>
> The result of this is the XML produced is incorrect.
>
> I could see that the old object has been cached. But by which
process? and why it does not refresh? and why it overrides the current
state of the object? Why this happens only with the objects that are in
collections (ArrayList or Vector)?
>
> Your help would be greatly appreciated.
>
> My previous email is truncated in the interest of keeping this thread
relatively clean.
>
>
> Thanks
>
> Velusamy K. Velu
> (614) 728-0017
>
> >>> [EMAIL PROTECTED] 11/02/04 08:46AM >>>
> Hello:
>
> We are a developing a J2EE based web application. The combination of
Struts and STxx is used to
> .
> .
>
>
> .
>
> I wonder if anyone ran into this kind of problem. Any pointers would
greatly help us. We have been spending about 4 days fruitlessly on this
problem. I can provide more code snippets if necessary.
>
> Thanks
>
> Velusamy K. Velu
> (614) 728-0017
>
>
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>
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