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Hey Christian,
this seems to be a frequent obstacle: one of our students just
stumbled upon the same problem - related to "meta-model
schizophrenia" as it is called in the EMF mailing list - while
using Henshin.
A FAQ entry or even a hint somewhere in the tooling could be
supportive to users, although I am not sure what the best place to
put such a hint would be (having closed the import dialog
inattentively, you never see it again).
Regards,
Daniel
Am 12.09.2012 09:44, schrieb Christian Krause:
Hi Marco,
your transformation does not import the runtime version of the
UML metamodel (I think I mentioned this before). When you import
the UML metamodel, you must click on "runtime version", and not
"development version". You can "migrate" your transformation
like this: open the *.henshin file in a text editor and replace
every occurrence of:
../../plugin/org.eclipse.uml2.uml/model/UML.ecore
by
http://www.eclipse.org/uml2/3.0.0/UML
and run it again. The rule can still not be applied but the
error message does not appear. I hope that there is not another
problem...
cheers,
christian
On 09/11/2012 07:54 PM, Konersmann, Marco wrote:
Hi Christian,
thank you very much for your support. The workaround did
not work.
I noticed that the wizard has no problems with the
execution. I will also have a look at the code.
Cheers
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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--
Dipl.-Inf. Daniel Strüber
Philipps-Universität Marburg
Fachbereich Mathematik und Informatik
Mehrzweckgebäude 05D12
Hans-Meerwein-Str.
D-35032 Marburg
Tel: +49-6421-28-21511
Email: strueber@xxxxxxxxxxxxxxxxxxxxxxxxx
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