Nick:
I would like to do that to identify the root cause of the problem. Though the problem
appears to be in the Marshaller.marshal(...) method my hunch is the Tomcat is caching
the objects somewhere in the environment. That would be the only reason for the
object to attain a state that was valid about few days back.
At this point I am sure the problem is not with Castor but I could not spend any more
time on it due to the critical stage of our project. Once we get past the critical
stage I will revisit this problem and investigate it again. Currently we are
switching to Apache's betwick framework and it seems to have no such problems, so far.
I greatly appreciate your suggestion.
Thanks
Velusamy K. Velu
(614) 728-0017
>>> [EMAIL PROTECTED] 11/03/04 10:29PM >>>
Velusamy, I know this is probably going to be a little bit to ask, but
could you possibly try and setup a separate, standalone test case that
will run outside of struts?
As you know its tough to debug things inside a web-app, and having a
small bite size chunk of code that causes the error would be great.
This means we would need a small test case, as well as the classes you
are trying to marshal. If you could just package everything up in a
zip file that would be easist way to handle it.
Also, what version of Castor are you using? If its 0.9.5.3 can I
suggest you try the release candidate for 0.9.5.4. Its a bug fix
release so it shouldn't change any existing constructs you have in
your code.
-Nick
On Wed, 03 Nov 2004 10:34:43 -0500, Velusamy Velu
<[EMAIL PROTECTED]> wrote:
> 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
> >
> >
> > -----------------------------------------------------------
> > If you wish to unsubscribe from this mailing, send mail to
> > [EMAIL PROTECTED] with a subject of:
> > unsubscribe castor-user
> >
> >
> >
>
> -----------------------------------------------------------
> If you wish to unsubscribe from this mailing, send mail to
> [EMAIL PROTECTED] with a subject of:
> unsubscribe castor-user
>
> -----------------------------------------------------------
> If you wish to unsubscribe from this mailing, send mail to
> [EMAIL PROTECTED] with a subject of:
> unsubscribe castor-user
>
> -----------------------------------------------------------
> If you wish to unsubscribe from this mailing, send mail to
> [EMAIL PROTECTED] with a subject of:
> unsubscribe castor-user
>
>
> -----------------------------------------------------------
> If you wish to unsubscribe from this mailing, send mail to
> [EMAIL PROTECTED] with a subject of:
> unsubscribe castor-user
>
>
>
-----------------------------------------------------------
If you wish to unsubscribe from this mailing, send mail to
[EMAIL PROTECTED] with a subject of:
unsubscribe castor-user
-----------------------------------------------------------
If you wish to unsubscribe from this mailing, send mail to
[EMAIL PROTECTED] with a subject of:
unsubscribe castor-user
