| loader constraint violation when launching an EMF compare comparison [message #1842015] |
Mon, 07 June 2021 05:47  |
Eclipse User |
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Hello,
I have a couple of questions to deal with "EMF compare" and "model to model comparison" in general.
I am trying to achieve a comparison between two xmi models, which are different from each other (i) the first is an output model which is the result of a transformation that I run on an instance of an input meta-model, (ii) the second is an instance (conformant to the output meta-model), which I created to represent what the correct output form should be after the transformation (aka, an oracle model).
I tried using 'EMF compare' to achieve a comparison between multiple different output models (which I got after running my transformation on multiple different input models) and the oracle, 'correct' model, with the aim of validating my proposed transformation.
However, whenever I try to run the "compare with -> each other" I get the following error message and no result :
An internal error occurred during: "Computing Model Differences".
loader constraint violation: loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @477ad3b6 wants to load interface com.google.common.collect.Multimap. A different interface with the same name was previously loaded by org.eclipse.osgi.internal.loader.EquinoxClassLoader @3a161902. (com.google.common.collect.Multimap is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @3a161902, parent loader 'platform')
I tried to delete <workspace>/.metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi and restart my workspace. However, the problem sustained.
My questions are:
(i)Based on my description, is using EMF compare appropriate for my requirements? as explained above, I need to compare each output model with the same oracle model and get a score or something to decide if the transformation gave the correct output or not.
(ii) If yes, what is causing this problem and how can I fix it?
(iii) if no, what is a proper tool or plugin to use to achieve what I need?
An additional question, which might be a little out of the scope of the question is:
(iv) I have seen works that compare the output models with an oracle and classify those results into a hyperspace and hyperlanes (false positive, false negative, etc), and based on that they would assess the correctness of their proposed transformation. However, I could not find proper documentation on how to achieve that by myself (in an academic experiment manner). Could anyone provide me with directions or documentation on how to make a proper comparison and get an assessment of my transformation validity?
Thank you in advance.
Regards.
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