[news.eclipse.modeling.mdt.uml2] Re: Problems with DerivedUnion during d

[Kenn Hussey <Kenn.Hussey@xxxxxxxxx>]

Timothy,

I wouldn't have expected to see an 'ownedElement' element in the 
serialization, since derived unions are, by definition read-only (hence 
the reason why the addition is failing upon deserialization). Did you 
make that feature transient in the metamodel?

Kenn

Timothy Marc wrote:
> Hey all,
>
> i'm using the UML2 genmodel to generate a uml-like metamodel with 
> subsets and unions etc. I've rebuild the Element -> ownedComment 
> relationship of the UML 2.2 Superstructure (Figure 7.3). Instead of 
> Comment, i've sed the term Annotation. The model looks like
>
> Element {abstract}
>     +/owner 0..1 {union, read-only}
>     +/ownedElement * {union, read-only}
>
> TestingModel extends Element
>     + annotation * {subsets ownedElement}
>
> Annotation extends Element
>
>
> When i define a simple model like the model mentioned in the following 
> XMI snippet
>
> <?xml version="1.0" encoding="UTF-8"?>
> <union:TestingModel xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI"; 
> xmlns:union="http:///union.ecore"; ownedElement="//@annotation.0">
>   <annotation/>
> </union:TestingModel>
>
> i ran allways in an exception during deserialization. I've tried both 
> the editor and the programmatically deserialization. Both fail with the 
> following exception trace. It seems, that somewhere the 
> DerivedEObjectEList.add() method will be called.
>
> org.eclipse.emf.ecore.xmi.IllegalValueException: Value 
> 'union.impl.AnnotationImpl@352d87' is not legal. 
> (platform:/resource/f/My.union, -1, -1)
>     at 
> org.eclipse.emf.ecore.xmi.impl.XMLHandler.setFeatureValue(XMLHandler.java:2648) 
>
>     at 
> org.eclipse.emf.ecore.xmi.impl.XMLHandler.handleForwardReferences(XMLHandler.java:1135) 
>
>     at 
> org.eclipse.emf.ecore.xmi.impl.XMLHandler.endDocument(XMLHandler.java:1214)
>     at 
> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endDocument(Unknown 
> Source)
>     at 
> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown 
> Source)
>     at 
> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown 
> Source)
>     at 
> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown 
> Source)
>     at 
> com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
>     at 
> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown 
> Source)
>     at 
> com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown 
> Source)
>     at javax.xml.parsers.SAXParser.parse(Unknown Source)
>     at 
> org.eclipse.emf.ecore.xmi.impl.XMLLoadImpl.load(XMLLoadImpl.java:181)
>     at 
> org.eclipse.emf.ecore.xmi.impl.XMLResourceImpl.doLoad(XMLResourceImpl.java:180) 
>
>     at 
> org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1445) 
>
>     at 
> org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1241) 
>
>     at 
> org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoad(ResourceSetImpl.java:255) 
>
>     at 
> org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:270) 
>
>     at 
> org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.getResource(ResourceSetImpl.java:397) 
>
>     at union.presentation.UnionEditor.createModel(UnionEditor.java:950)
>     at union.presentation.UnionEditor.createPages(UnionEditor.java:1007)
>     at 
> org.eclipse.ui.part.MultiPageEditorPart.createPartControl(MultiPageEditorPart.java:310) 
>
>     at ....
>
>
> Caused by: java.lang.UnsupportedOperationException
>     at 
> org.eclipse.uml2.common.util.DerivedEObjectEList$DerivedListIterator.add(DerivedEObjectEList.java:278) 
>
>     at java.util.AbstractSequentialList.add(Unknown Source)
>     at 
> org.eclipse.uml2.common.util.DerivedEObjectEList.addUnique(DerivedEObjectEList.java:636) 
>
>     at 
> org.eclipse.emf.ecore.xmi.impl.XMLHelperImpl.setValue(XMLHelperImpl.java:1192) 
>
>     at 
> org.eclipse.emf.ecore.xmi.impl.XMLHandler.setFeatureValue(XMLHandler.java:2643) 
>
>     ... 58 more
>
>
> For serialization and deserialization i'm using an XMIBResource(Factory) 
> created by the genmodel automatically. Please let me know, what is going 
> wrong in this really simple example.
>
> Thanks in advance
> Timothy