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XText integration with GMF [message #856319]

Wed, 25 April 2012 15:02

Zlatka Manas

Messages: 26
Registered: March 2012

Junior Member

Hi,
I am trying to implement the XText Integration with GMF Editors(as explained in the documentation for Xtext) with my own model.
When I try to make a diagram for my model, I get the following error:

org.xtext.example.mydsl.ui.internal.MyDslActivator - com.google.inject.internal.ComputationException: java.lang.NoClassDefFoundError: xxx/xxx/xxx/Instance .

Anyone has any idea how to solve this??? Why it does not recognize the classes from the model?

Thanks.

Zlatka

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Re: XText integration with GMF [message #869813 is a reply to message #856319]

Fri, 04 May 2012 11:44

Zlatka Manas

Messages: 26
Registered: March 2012

Junior Member

So, a new workspace and doing it step by step seemed to work for the previous error. Now, I am getting the following when I create a diagram:

These errors need to be fixed before the model can be serialized.
System: Feature System.instance holds 0 non-transient value(s), but at least 1 are required.
Can anybody explain this error and maybe the reason it is there?
Is it something with the model?

Zlatka

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Re: XText integration with GMF [message #870044 is a reply to message #869813]

Sat, 05 May 2012 22:51

Jan Koehnlein

Messages: 760
Registered: July 2009
Location: Hamburg

Senior Member

Your grammar says that you have to specify at least one System.instance,
but your model does not have one. So it cannot be serialized such that
the result it conforms to your grammar.

So either your grammar is too strict or your model is wrong.

Am 04.05.12 13:44, schrieb Zlatka Manas:
> So, a new workspace and doing it step by step seemed to work for the
> previous error. Now, I am getting the following when I create a diagram:
>
> These errors need to be fixed before the model can be serialized.
> System: Feature System.instance holds 0 non-transient value(s), but at
> least 1 are required.
> Can anybody explain this error and maybe the reason it is there?
> Is it something with the model?
>
> Zlatka

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---
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Re: XText integration with GMF [message #870178 is a reply to message #870044]

Mon, 07 May 2012 07:27

Zlatka Manas

Messages: 26
Registered: March 2012

Junior Member

Thanks Jan, I changed the model and now it is ok.

Another question about the integration of gmf and xtext: do you assume the root(element) of your diagram to be the root of the model?
I have one root element which contains two other for which I want to have a diagram.
In the DiagramUpdater, in the method for getting the children of the root element for my diagram I get an error :

!MESSAGE IRJS0007E Semantic refresh failed.
!STACK 0
java.lang.ClassCastException: xxx.impl.xxxImpl cannot be cast to xxx.yyy where xxx is the root element and yyy is the element for my diagram.

For some reason, instead of returning yyy element, it returns the parent element of yyy (xxx) and I cannot create a simple diagram and try the implementation.

Let me know if you have any ideas for this issue.

Thanks.

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Re: XText integration with GMF [message #870192 is a reply to message #870178]

Mon, 07 May 2012 08:22

Jan Koehnlein

Messages: 760
Registered: July 2009
Location: Hamburg

Senior Member

I do not make any assumptions on that, but GMF does:
No matter if the semantic model is plain EMF or Xtext-based, GMF will
have problems with multiple editors on the same semantic model. Better
ask in the GMF newsgorup...

Am 07.05.12 09:27, schrieb Zlatka Manas:
> Thanks Jan, I changed the model and now it is ok.
> Another question about the integration of gmf and xtext: do you assume
> the root(element) of your diagram to be the root of the model? I have
> one root element which contains two other for which I want to have a
> diagram.
> In the DiagramUpdater, in the method for getting the children of the
> root element for my diagram I get an error :
>
> !MESSAGE IRJS0007E Semantic refresh failed.
> !STACK 0
> java.lang.ClassCastException: xxx.impl.xxxImpl cannot be cast to xxx.yyy
> where xxx is the root element and yyy is the element for my diagram.
> For some reason, instead of returning yyy element, it returns the parent
> element of yyy (xxx) and I cannot create a simple diagram and try the
> implementation.
>
> Let me know if you have any ideas for this issue.
>
> Thanks.
>

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---
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Re: XText integration with GMF [message #870210 is a reply to message #870192]

Mon, 07 May 2012 09:43

Zlatka Manas

Messages: 26
Registered: March 2012

Junior Member

For the moment, I want to have only one diagram working so I can actually have your example working with my model.
The model is like this:
Poosl
- System
- Cluster
- Process
- Data

System
- Instance (a Cluster or Process)
- Channel

etc.

So, I want to have a System diagram displaying Cluster and Process nodes.
My confusion is why the diagram I generate, as a View element returns the Poosl and not the System. In a previous implementation this was working correctly.
For some reason, with your example, it just uses a different element thus the casting error.

Is there any part in the code where you assign or change the element?

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Re: XText integration with GMF [message #870375 is a reply to message #870210]

Mon, 07 May 2012 20:46

Jan Koehnlein

Messages: 760
Registered: July 2009
Location: Hamburg

Senior Member

Would be helpful to know what kind of example code you're using.

Am 07.05.12 11:43, schrieb Zlatka Manas:
> For the moment, I want to have only one diagram working so I can
> actually have your example working with my model.
> The model is like this:
> Poosl
> - System
> - Cluster
> - Process
> - Data
>
> System
> - Instance (a Cluster or Process)
> - Channel
>
> etc.
>
> So, I want to have a System diagram displaying Cluster and Process
> nodes. My confusion is why the diagram I generate, as a View element
> returns the Poosl and not the System. In a previous implementation this
> was working correctly. For some reason, with your example, it just uses
> a different element thus the casting error.
> Is there any part in the code where you assign or change the element?

--
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---
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Re: XText integration with GMF [message #870435 is a reply to message #870375]

Tue, 08 May 2012 07:51

Zlatka Manas

Messages: 26
Registered: March 2012

Junior Member

I am using this example
samoa.informatik.uni-kiel.de/~rvm/xtext-2.0.0/doc/210-emf-integration-3.html

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Re: XText integration with GMF [message #870436 is a reply to message #870375]

Tue, 08 May 2012 08:29

Zlatka Manas

Messages: 26
Registered: March 2012

Junior Member

I am using this example
samoa.informatik.uni-kiel.de/~rvm/xtext-2.0.0/doc/210-emf-integration-3.html

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Re: XText integration with GMF [message #870471 is a reply to message #870436]

Tue, 08 May 2012 11:27

Jan Koehnlein

Messages: 760
Registered: July 2009
Location: Hamburg

Senior Member

The example in the docs is for the root element of an Xtext resource
only. YOu have to dig deeper into GMF to learn how to put a diagram on a
non-root element.

Am 08.05.12 10:29, schrieb Zlatka Manas:
> I am using this example
> samoa.informatik.uni-kiel.de/~rvm/xtext-2.0.0/doc/210-emf-integration-3.html
>

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---
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