Re: [castor-user] Marshaling issue

Keith Visco Thu, 04 Nov 2004 12:16:11 -0800

Well, since I'm extremely confident that the Castor Marshaller doesn't change any values, and only calls gettter methods or FieldHandler.getValue(), then it sounds to me like your object is being controlled by some sort of proxy and when Castor Marshaller invokes a getter perhaps some sort of Lazy loading is taking place from the Database.

--Keith

Velusamy Velu wrote:

Yes, I did. The code snippet was in my original posting. I am including it here again for the folks out there - try { Marshaller marshaller = new Marshaller(writer); marshaller.setSuppressXSIType(true); marshaller.setValidation(true); marshaller.setDebug(true); marshaller.marshal(object); // <<<<< this line changes the object writer.flush(); marshaller = null; document = convert(writer.toString()); } catch (Exception e) { Logger.throwing(e); throw new AppException("Unable to create XML: " + e.getMessage(), e); } finally { try { writer.close(); } catch (IOException e) { Logger.throwing(e); throw new AppException("Error closing the output stream"); } }

The line of code that changes the values of the attributes of the object is  
marshaller.marshal(object);

Please let me know if this is sufficient to resolve the issue.

Thanks

Velusamy K. Velu
(614) 728-0017

[EMAIL PROTECTED] 11/02/04 11:16PM >>>


Have you tried to simply create a new Marshaller before marshalling?

--Keith

Velusamy Velu wrote:

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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Re: [castor-user] Marshaling issue

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