Reference to a Converter object...

[Ben Douglas]

Hello,

I'm running into an issue, that I have a reference to a "Converted"
object.  I write a string instead of the whole object since the object
will only exist once for that "key" written.  My question is why isn't
the reference "deserialized" correctly.

Thanks,
Ben

I'm seeing the following error:

com.thoughtworks.xstream.converters.ConversionException: Invalid reference
---- Debugging information ----
reference           : 120
class               :
com.cloudswitch.automation.tests.server.TestLocalServer
required-type       :
com.cloudswitch.automation.tests.cloudswitchnode.TestCloudSwitchNode
line number         : 3385
-------------------------------

The xml in question:

<com.cloudswitch.automation.tests.cloudprovider.TestCloudAccount
id="120">Amazon</com.cloudswitch.automation.tests.cloudprovider.TestCloudAccount>

and in another object:

<cloudAccount reference="120"/>

The converter does basic static "get" of the object that was registered
with the string written to xml:

     @Override
     public void marshal(Object value, HierarchicalStreamWriter writer,
             MarshallingContext context)
     {
         TestCloudAccount cloudAccount = (TestCloudAccount) value;
         writer.setValue(cloudAccount.getProviderName());
     }

     @Override
     public Object unmarshal(HierarchicalStreamReader reader,
             UnmarshallingContext context)
     {
         String providerName = reader.getValue();
         return TestCloudAccount.getCloudAccount(providerName);
     }



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[Jörg Schaible-2]

Hi Ben,

Ben Douglas wrote at Freitag, 16. Oktober 2009 17:42:

> Hello,
>
> I'm running into an issue, that I have a reference to a "Converted"
> object.  I write a string instead of the whole object since the object
> will only exist once for that "key" written.  My question is why isn't
> the reference "deserialized" correctly.
>
> Thanks,
> Ben
>
> I'm seeing the following error:
>
> com.thoughtworks.xstream.converters.ConversionException: Invalid reference
> ---- Debugging information ----
> reference           : 120
> class               :
> com.cloudswitch.automation.tests.server.TestLocalServer
> required-type       :
> com.cloudswitch.automation.tests.cloudswitchnode.TestCloudSwitchNode
> line number         : 3385
> -------------------------------
>
> The xml in question:
>
> <com.cloudswitch.automation.tests.cloudprovider.TestCloudAccount
>

id="120">Amazon</com.cloudswitch.automation.tests.cloudprovider.TestCloudAccount>

>
> and in another object:
>
> <cloudAccount reference="120"/>
>
> The converter does basic static "get" of the object that was registered
> with the string written to xml:
>
>      @Override
>      public void marshal(Object value, HierarchicalStreamWriter writer,
>              MarshallingContext context)
>      {
>          TestCloudAccount cloudAccount = (TestCloudAccount) value;
>          writer.setValue(cloudAccount.getProviderName());
>      }
>
>      @Override
>      public Object unmarshal(HierarchicalStreamReader reader,
>              UnmarshallingContext context)
>      {
>          String providerName = reader.getValue();
>          return TestCloudAccount.getCloudAccount(providerName);
>      }

Actually I cannot really explain what happens. The reference mechanism is
implemented in the MarshallingStrategy (selected by XStream's setMode
method). At deserialization time the references are kept internally -
unless the deserialized object is suddenly null. Are you sure that
the "Amazon" instance exists? Did you initialize the XStream in the same
way for serialization and deserialization?

- Jörg


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