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Type in Ecore not found [message #1749231]

Sat, 03 December 2016 13:47

Eclipse User

Hi,

I have a couple of questions regarding the definition and registration of ecore models.

Q1. In the example metamodels, there exist two files for each type of metamodel. One with the '.emf' extension and the other one with the '.ecore' extension (i.e., Graph.emf and Graph.ecore). Seems like both of them are equivalent. I am wondering, for defining my own metamodel, will I also have to create both types of files? Or, creating just '.ecore' file is enough?

Q2. I created a simple ecore file by following the tutorial on http://eclipsesource.com/blogs/tutorials/emf-tutorial.

Please find the attached screenshot of the ecore file. I registered this file and also specify it in the list of metamodels for target specification while creating the '.launch' file. Unfortunately, after running the following ETL code, the console output says "Type B1 not found". What am I doing wrong here?

ETL Code:

         rule basic
		transform source:UML_Input!Model
		to target:B1{
			target.name=source.name;
		}

Attachment: epsilon_ecore.png
(Size: 10.22KB, Downloaded 189 times)

Re: Type in Ecore not found [message #1749247 is a reply to message #1749231]

Sun, 04 December 2016 05:41

Eclipse User

Q1. They are just two different ways of representation, one of which can be converted to the other one automatically.

Q2. B1 is not a kind of EClass, it is a package. I can guess that ETL rules are design to generate instances of EClasses. So your rule should be something like:

rule basic
	transform 
                source:UML_Input!Model
		       to 
                target:B1!C
{
        target.name=source.name;
}

assuming that your output model is named B1 and you are trying to create an instance of C.

Re: Type in Ecore not found [message #1749255 is a reply to message #1749247]

Sun, 04 December 2016 10:25

Eclipse User

Hi Bugra,

Thanks for the response. I already tried using "B1!C" instead of "B1", but with no changes in the result. Console output for this one is "Type B1!C not found". Is there anything else that can possibly cause this problem?

Re: Type in Ecore not found [message #1749257 is a reply to message #1749255]

Sun, 04 December 2016 11:19

Eclipse User

Hi,

As long as your model is named B1 in the model configuration dialog of your run configuration this should work fine. If it doesn't, could you please put together a minimal example [1] we can use to reproduce this?

Cheers,
Dimitris

[1] https://www.eclipse.org/epsilon/doc/articles/minimal-examples/

Re: Type in Ecore not found [message #1749271 is a reply to message #1749257]

Sun, 04 December 2016 23:51

Eclipse User

Dimitris Kolovos wrote on Sun, 04 December 2016 16:19

Hi,

As long as your model is named B1 in the model configuration dialog of your run configuration this should work fine. If it doesn't, could you please put together a minimal example [1] we can use to reproduce this?

Cheers,
Dimitris

[1] https://www.eclipse.org/epsilon/doc/articles/minimal-examples/

Hi Dimitris,

Thanks for pointing out the problem. The model was not named B1 in the model configuration window previously and I think that's what caused the problem.

However, I am still having issue in launching this transformation Sad

. Now, I am getting a Java runtime null-pointer exception. Please find attached screenshots. As you will see, for making it simple, I used the 'tree.model' from epsilon example directory as the input and B1.ecore as the metamodel of the output. Am I doing anything wrong?

Attachment: EpsilonEditorWindow_WithErrorMessage.png
(Size: 128.39KB, Downloaded 178 times)
Attachment: RunConfigurationWindow_1.png
(Size: 23.68KB, Downloaded 187 times)
Attachment: RunConfigurationWindow_2.png
(Size: 24.38KB, Downloaded 180 times)
Attachment: RunConfigurationWindow_3.png
(Size: 52.36KB, Downloaded 171 times)
Attachment: ModelConfigurationWindow_B1.png
(Size: 61.70KB, Downloaded 164 times)

Re: Type in Ecore not found [message #1749306 is a reply to message #1749271]

Mon, 05 December 2016 04:54

Eclipse User

Hi John,

A minimal example [1] would help a lot.

Cheers,
Dimitris

[1] https://www.eclipse.org/epsilon/doc/articles/minimal-examples/

Re: Type in Ecore not found [message #1749339 is a reply to message #1749306]

Mon, 05 December 2016 11:12

Eclipse User

Hi John,

It appears that the Name attribute of your Cla1 class is missing a type (the way I found out was by opening J1.ecore, right-clicking on the J1 EPackage and selecting "Validate"). Setting its type to EString seems to be doing the trick.

Cheers,
Dimitris

Re: Type in Ecore not found [message #1749342 is a reply to message #1749339]

Mon, 05 December 2016 12:01

Eclipse User

Dimitris Kolovos wrote on Mon, 05 December 2016 16:12

Hi John,

It appears that the Name attribute of your Cla1 class is missing a type (the way I found out was by opening J1.ecore, right-clicking on the J1 EPackage and selecting "Validate"). Setting its type to EString seems to be doing the trick.

Cheers,
Dimitris

Yes, it worked! Thank you very much.

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