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[ATL] "Copy" reference problem (?) [message #554798]

Tue, 24 August 2010 12:35

Michael Schmitz

Messages: 3
Registered: August 2010

Junior Member

Sorry, but I don't really understand the problem, which ATL has, and the error message as well. I try to explain:

I've got two different Metamodels: MM0 and MM1. MM0 has a class A und MM1 has a class named B. MM0!A has a directed 0..1-association to MM1!B called linked. The instances of the MMs are in different files as well. So in the file f0.mm0 (for MM0) is a href to the file f0.mm1 (MM1) to the linked element.

The Problem: An easy m2m-transformation with ATL which only "copy" the file f0.mm0 to f1.mm0 doesn't work.

The following code shows the "copy":

module test;
create OUTmm0: MM0 from INmm0 : MM0;

rule A2A {
	from s : MM0!A in INmm0
	to t : MM0!A in OUTmm0(
		linked <- s.linked
	)
}

The access to s.linked will thrown the error-message :

org.eclipse.m2m.atl.engine.emfvm.VMException: The value of type 'class org.eclipse.emf.ecore.impl.DynamicEObjectImpl' must be of type 'org.eclipse.emf.ecore.impl.EClassImpl@554d2af5 (name: A) (instanceClassName: null) (abstract: false, interface: false)' ....

I've found a workaround also:
It works if I change multiplicity of the association linked from 0..1 to 0..* in MM0.

But I don't want to change my metamodel. By the way, the transformation with ETL works fine.

Has anybody such a problem and solved it without changing the metamodel?

System: Windows7 (x64) with eclipse Helios Release
Build id: 20100617-1415 and ATL 3.1.0

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Re: [ATL] "Copy" reference problem (?) [message #554811 is a reply to message #554798]

Tue, 24 August 2010 13:08

Sylvain EVEILLARD

Messages: 556
Registered: July 2009

Senior Member

Did you enable the inter-model references ?

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Re: [ATL] "Copy" reference problem (?) [message #554853 is a reply to message #554811]

Tue, 24 August 2010 14:39

Michael Schmitz

Messages: 3
Registered: August 2010

Junior Member

Thanks for your help.

Yes, I have enable the inter-model references.
I think it's lay to the multiplicity of the association because it is possible to refer to another model when the multiplicity is * (inf.).

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Re: [ATL] "Copy" reference problem (?) [message #554862 is a reply to message #554798]

Tue, 24 August 2010 14:57

Sylvain EVEILLARD

Messages: 556
Registered: July 2009

Senior Member

Have you tried to switch VM then ? I remember I had a similar problem; don't exactly remember how I solved it tho Embarrassed

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Re: [ATL] "Copy" reference problem (?) [message #554902 is a reply to message #554862]

Tue, 24 August 2010 16:35

Michael Schmitz

Messages: 3
Registered: August 2010

Junior Member

Thanks. I switched the VM, it doesn't help. I do all things, that might be helpful in the past (and I've found in forums). But now, I really don't know what I should do. The behaviour of ATL is so strange, that I can't explain my problem exactly. It has to work, but it doesn't. It could be a bug. I don't know. Sad