Re: [morph-user] ClassCastException... (fwd)

[Hernan S. <hsi...@pd...>]

Clever workaround, it worked and will be fine in the short term on the project 
I'm working on.

Thanks... Hernan


On Wed, 9 Mar 2005, Matt Sgarlata wrote:

> Hi Hernan,
> 
> I think the problem is probably that the components property of the 
> DelegatingTransformer is of type Component[], so when Spring populates 
> the property, it create an array with runtime type Component[].  The 
> DelegatingTransformer is expecting a runtime type of Transformer[].  
> This would explain why you can setup your transformer programmatically 
> but not using Spring.
> 
> I guess the easiest quick fix would probably be for you to subclass the 
> DelegatingTransformer and expose a Transformer[] setTransformers method 
> so that Spring creates an array with the correct runtime type.  Long 
> term, I'm planning on replacing the components property with a Map of 
> String transformer names to Transformer objects.  This will make it 
> easier to work with the DelegatingTransformer programmatically if you 
> want to, for example, replace only a single transformer.
> 
> Does this short-term fix work for you?
> 
> Matt
> 
> Hernan Silberman wrote:
> 
> >I failed to mention:
> >
> >I'm using Morph 0.8.3
> >
> >thnx...
> >hernan
> >
> >---------- Forwarded message ----------
> >Date: Tue, 8 Mar 2005 14:55:57 -0800 (PST)
> >From: Hernan Silberman <hsi...@pd...>
> >To: mor...@li...
> >Subject: ClassCastException...
> >
> >
> >I'm sure I'm doing something wrong here... I'm trying to build a graph 
> >transformer using a simple Spring context that defines this bean:
> >
> ><bean
> >    id="graphTransformer"
> >    class="net.sf.morph.transform.transformers.DelegatingTransformer">
> >    <property name="components">
> >        <list>
> >            <ref bean="immutableTypesOnlyIdentityConverter"/>
> >            <ref bean="timeCopier"/>
> >            <ref bean="collectionCopier"/>
> >            <ref bean="propertyNameMatchingCopier"/>
> >            <ref bean="containerCopier"/>
> >        </list>
> >    </property>
> ></bean>
> >
> >
> >All of the reference beans are very simple bean definitions, for example:
> >
> ><bean
> >    name="collectionCopier"
> >    class="net.sf.morph.transform.copiers.CollectionCopier"/>
> >
> >The context loads up fine as a FileSystemXmlApplicationContext.  When I 
> >try to do the following simple conversion in my Test case:
> >
> >public void testSimpleConvert()
> >{
> >    String theSource = new String("Hello");
> >    String theDest = 
> >       (String)myGraphTransformer.convert( String.class, theSource );
> >    assertNotNull(theDest);
> >    assertEquals(theSource,theDest);
> >}
> >
> >...I get the exception below.  I don't get this exception when I build this 
> >DepegatingTransformer programmatically.  Also, I don't get the exception 
> >when I leave off the "components" property definition for the graphTransformer 
> >bean.  I can see DelegatingTransformer is doing a case to Transformer[] which is 
> >failing.
> >
> >Please let me know if you spot my error... thanks in advance... Hernan
> >
> >
> >net.sf.morph.transform.TransformationException: Could not initialize transformer 
> >net.sf.morph.transform.transformers.DelegatingTransformer@e6f7d2 (class 
> >net.sf.morph.transform.transformers.DelegatingTransformer)
> >	at 
> >net.sf.morph.transform.transformers.BaseTransformer.initialize(BaseTransformer.java:193)
> >	at 
> >net.sf.morph.transform.transformers.BaseTransformer.getDestinationClasses(BaseTransformer.java:149)
> >	at 
> >net.sf.morph.util.TransformerUtils.isImplicitlyTransformable(TransformerUtils.java:53)
> >	at 
> >net.sf.morph.transform.transformers.BaseTransformer.isTransformable(BaseTransformer.java:105)
> >	at 
> >net.sf.morph.transform.transformers.BaseTransformer.convert(BaseTransformer.java:216)
> >	at 
> >net.sf.morph.transform.transformers.BaseTransformer.convert(BaseTransformer.java:237)
> >	at 
> >tests.morph.MorphContextTest.testSimpleConvert(MorphContextTest.java:59)
> >...(Click for full stack trace)...
> >Caused by: java.lang.ClassCastException
> >	at 
> >net.sf.morph.transform.transformers.DelegatingTransformer.getTransformers(DelegatingTransformer.java:260)
> >	at 
> >net.sf.morph.transform.transformers.DelegatingTransformer.getSourceClassesImpl(DelegatingTransformer.java:136)
> >	at 
> >net.sf.morph.transform.transformers.BaseTransformer.initialize(BaseTransformer.java:171)
> >	... 21 more
> >
> >
> >
> >
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> 
> 
> 
> 
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-- 
Hernan Silberman
PDI/Dreamworks
ext.29162 / 650-562-9162 / cell 415-810-5809
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