[henshin-dev] NPE when using Attribute in UML instance models

[Marco Konersmann <marco.konersmann@xxxxxxxxxxxxxxxxx>]

Hello again,

working on UML models, I ran into another error that I hope you can help 
me with.
My UML instance model is:
Model --packagedElement--> Component (name:WebShop)

My transformation rule is:
<<preserve>> Model --<<delete>>PackagedElement---> <<delete>> Component 
(name="WebShop")

This gives me a NPE:
Exception in thread "main" java.lang.NullPointerException
    at 
org.eclipse.emf.henshin.interpreter.info.VariableInfo.createConstraints(VariableInfo.java:168)
    at 
org.eclipse.emf.henshin.interpreter.info.VariableInfo.createVariables(VariableInfo.java:104)
    at 
org.eclipse.emf.henshin.interpreter.info.VariableInfo.<init>(VariableInfo.java:70)
    at 
org.eclipse.emf.henshin.interpreter.info.RuleInfo.<init>(RuleInfo.java:29)
    at 
org.eclipse.emf.henshin.interpreter.impl.EngineImpl.getRuleInfo(EngineImpl.java:499)
    at 
org.eclipse.emf.henshin.interpreter.impl.EngineImpl$MatchFinder.<init>(EngineImpl.java:197)
    at 
org.eclipse.emf.henshin.interpreter.impl.EngineImpl$MatchGenerator.iterator(EngineImpl.java:157)
    at 
org.eclipse.emf.henshin.interpreter.impl.RuleApplicationImpl.execute(RuleApplicationImpl.java:90)
    at init.Example.run(Example.java:61)
    at init.Example.main(Example.java:75)

in createConstraints(..) line 168 is:
attributeValue = castDown(attributeValue, 
attribute.getType().getEType().getInstanceClassName());
with attribute.getType().getEType() being null.

attribute.getType() resolves to
"org.eclipse.emf.ecore.impl.EAttributeImpl@4a646ffe (eProxyURI: 
../../../plugin/org.eclipse.uml2.uml/model/UML.ecore#//NamedElement/name)"
That "name" attribute has the EType "String [java.lang.String]" in the 
meta model.

Is this a bug in Henshin, or do I use the API in a wrong way?

I attached an example project.

Best regards
Marco

Attachment: test.henshin.uml.zip
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