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| Re: [EDAPT] Issue when using 'load resource' [message #1420876 is a reply to message #1415184] |
Wed, 10 September 2014 16:02   |
 Maximilian Koegel
Messages: 253
Registered: July 2009 |
Senior Member |
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Hi Jörg,
I just saw your post accidentally. A better forum for your question is
the EMFT newsgroup:
https://www.eclipse.org/forums/index.php/f/19/
I just added a task for Edapt to reflect this correctly on the Webpage.
Concerning your question, could you please provide the Stacktrace.
Anyway I think in the current implementation it is not possible to add
new metamodels to the history in later revisions and your fix is a valid
workaround.
Cheers,
Maximilian
--
Maximilian Kögel
Get Professional Eclipse Support: http://eclipsesource.com/munich
Am 02.09.2014 11:10, schrieb Joerg Hermann:
> I hope this is the correct forum for edapt related questions...
>
> I get a NullPointerException when running the migration on a model at
> MigrationReconstructor$MigrationReconstructorSwitch(EcoreReconstructorSwitchBase<E>).create(EObject,
> EReference, EClass) line: 97, when the 'add()' method is invoked.
> This happens, when the doReconstruct() is performed on the 2nd release
> in my history containing
> an additionally loaded resource (Composite Change adding the entire meta
> model).
> In my setup I have a base model (*.ecore) in which I have a single
> reference to an element in a second model.
>
> To exclude mismatches in the history, I tried to start from the scratch
> as follows:
> * Removed the existing history
> * Removed the reference to the 2nd model
> * Create History (I now have the Composite change covering my base model)
> * Release (let's call it V1)
> * Load Resource (my 2nd model; this creates another Composite change
> containing the elements of this model)
> * Create Reference from a class of the base model to a class of the 2nd
> model
> * Release (let's call it V2)
>
> Now loading a model that requires migration from V1 to V2 throws the
> above mentioned NullpointerException when the Composite Change for the
> 2nd model is processed, more precisely on the first change that should
> create the EPackage.
>
> When I move the Composite change for the 2nd model to the initial
> release, everything works fine.
> I would expect that adding resources should be possible at any stage...
>
> What am I doing wrong?
>
> -
> best regards,
> Joerg
>
>
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| Re: [EDAPT] Issue when using 'load resource' [message #1421533 is a reply to message #1415184] |
Thu, 11 September 2014 13:49 |
Christophe Bouhier
Messages: 937
Registered: July 2009 |
Senior Member |
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On 02-09-14 11:10, Joerg Hermann wrote:
> I hope this is the correct forum for edapt related questions...
>
> I get a NullPointerException when running the migration on a model at
> MigrationReconstructor$MigrationReconstructorSwitch(EcoreReconstructorSwitchBase<E>).create(EObject,
> EReference, EClass) line: 97, when the 'add()' method is invoked.
Are you on the latest Edapt version? line 97 doesn't point to the
Reconstructor switch. A stacktrace would be handy.
http://git.eclipse.org/c/edapt/org.eclipse.emf.edapt.git/tree/plugins/org.eclipse.emf.edapt.history/src/org/eclipse/emf/edapt/migration/execution/MigrationReconstructor.java#n97
> This happens, when the doReconstruct() is performed on the 2nd release
> in my history containing
> an additionally loaded resource (Composite Change adding the entire meta
> model).
I am not positive this use case will work. Considering that Edapt
constructs a metamodel incrementally. So the orginal ecore (And it's
references) are reconstructed from the Composite change in the History.
When a 2nd release comes along, whith a Composite change, the Metamodel
reconstruction process is appearantly not capable to maintain the state.
(I mean constructing a meta-model in two different passes). The idea
is to have Migratable changes from release 2 onwards. (Which affect an
actual model). One could argue that modifications on the original Ecore
is the whole point, but something like a reference to another Ecore has
perhaps never been tested. I can't recall seeing this scenario in the
documentation or unit tests....
Would you please be so kind to log a bug for this. We could support the
scenario, or catch it and preempt it, if we don't want to support it.
(Load resource won't be allowed, when we have a 2nd release). A test
case building on the existing test framework would be good. (See
org.eclipse.emf.edapt.tests/data for examples), which would indeed
reproduce the issue you describe.
Thank You.
See also:
http://modelmoo.blogspot.nl/2013/12/how-edapt-works.html
> In my setup I have a base model (*.ecore) in which I have a single
> reference to an element in a second model.
>
> To exclude mismatches in the history, I tried to start from the scratch
> as follows:
> * Removed the existing history
> * Removed the reference to the 2nd model
> * Create History (I now have the Composite change covering my base model)
> * Release (let's call it V1)
> * Load Resource (my 2nd model; this creates another Composite change
> containing the elements of this model)
> * Create Reference from a class of the base model to a class of the 2nd
> model
I think this is the problematic part.
> * Release (let's call it V2)
>
> Now loading a model that requires migration from V1 to V2 throws the
> above mentioned NullpointerException when the Composite Change for the
> 2nd model is processed, more precisely on the first change that should
> create the EPackage.
>
> When I move the Composite change for the 2nd model to the initial
> release, everything works fine.
> I would expect that adding resources should be possible at any stage...
>
> What am I doing wrong?
>
> -
> best regards,
> Joerg
>
>
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