Hi Marco,
this exception is probably caused by a missing proxy resolution. A similar problem has been reported before. I am now inclined to enforce the resolution of all proxy objects during loading. I will make some experiments and see whether it works.
If you don't want to wait for the next release which will fix the problem (I expect that we roll out a new version in the next 2 weeks), you could try the following (works only if you execute it in code): before applying the transformation, run EcoreUtil.resolveAll(system),
where system is your transformation system. I don't know if that works. I will try it out in the next days.
Cheers,
christian
On 9/11/2012 5:31 PM, Marco Konersmann wrote:
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
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