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Strange error "Cannot find compatible feature ... in sealed EClass" [message #1061195]

Thu, 30 May 2013 09:32

Eclipse User

I have a Xtext grammar which looks like this:

grammar mygrammar with 
	com.iar.toolchain.dsl.ITL

import "http://iar.com/projectmodel" // defined using an xcore model
import "http://www.iar.com/toolchain/dsl/ITL" // from ITL.xtext

Project:
    'project' configuration=[Configuration]
;

projectmodel.xcore defines Project like this:

...
import com.iar.toolchain.dsl.itl.Configuration
...
class Project {
    ...
    refers Configuration configuration    
    ...
}

Xtext complains about the configuration cross reference, and says:

Cannot find compatible feature configuration in sealed EClass Project from imported package http://iar.com/projectmodel: The existing reference 'configuration' has an incompatible type 'Configuration'. The expected type is 'Configuration'.

projectmodel.xcore can correctly resolve Configuration, but when attempting to use it from mygrammar.xtext, there seems to be two different Configuration classes which are incompatible.

Any clues as two what is going on?

Re: Strange error "Cannot find compatible feature ... in sealed EClass" [message #1061214 is a reply to message #1061195]

Thu, 30 May 2013 10:41

Eclipse User

Jesper,

Are you using the latest RC2 builds? A number of problems relating to
Xcore usage as your model were recently fixed...

On 30/05/2013 3:32 PM, Jesper Eskilson wrote:
> I have a Xtext grammar which looks like this:
>
>
> grammar mygrammar with com.iar.toolchain.dsl.ITL
>
> import "http://iar.com/projectmodel" // defined using an xcore model
> import "http://www.iar.com/toolchain/dsl/ITL" // from ITL.xtext
>
> Project:
> 'project' configuration=[Configuration]
> ;
>
>
> projectmodel.xcore defines Project like this:
>
>
> ..
> import com.iar.toolchain.dsl.itl.Configuration
> ..
> class Project {
> ...
> refers Configuration configuration ...
> }
>
>
> Xtext complains about the configuration cross reference, and says:
>
>
> Cannot find compatible feature configuration in sealed EClass Project
> from imported package http://iar.com/projectmodel: The existing
> reference 'configuration' has an incompatible type 'Configuration'.
> The expected type is 'Configuration'.
>
>
> projectmodel.xcore can correctly resolve Configuration, but when
> attempting to use it from mygrammar.xtext, there seems to be two
> different Configuration classes which are incompatible.
>
> Any clues as two what is going on?

Re: Strange error "Cannot find compatible feature ... in sealed EClass" [message #1061241 is a reply to message #1061214]

Thu, 30 May 2013 13:20

Eclipse User

I tried installing the bleeding edge builds of both Xtend and Xcore, but now the Xcore editor refuses to start, and shows a whole bunch of these exceptions:

...
Caused by: com.google.inject.internal.util.$ComputationException: com.google.inject.internal.util.$ComputationException: java.lang.NoClassDefFoundError: org/eclipse/xtext/xbase/services/XbaseGrammarAccess$StaticQualifierElements
	at com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:553)
	at com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:419)
	at com.google.inject.internal.util.$CustomConcurrentHashMap$ComputingImpl.get(CustomConcurrentHashMap.java:2041)
	at com.google.inject.internal.FailableCache.get(FailableCache.java:50)
	at com.google.inject.internal.ConstructorInjectorStore.get(ConstructorInjectorStore.java:49)
	at com.google.inject.internal.ConstructorBindingImpl.initialize(ConstructorBindingImpl.java:125)
	at com.google.inject.internal.InjectorImpl.initializeJitBinding(InjectorImpl.java:521)
...

Re: Strange error &quot;Cannot find compatible feature ... in sealed EClass&quot; [message #1061294 is a reply to message #1061241]

Fri, 31 May 2013 00:45

Eclipse User

Jesper,

By bleeding edge do you mean the RC2 builds or nightly builds. We saw
this too locally, but it was caused by not having the right version of
Xbase installed; I committed changes to Xcore yesterday to make it work
with the changes to Xbase since the beginning of the week...

On 30/05/2013 7:20 PM, Jesper Eskilson wrote:
> I tried installing the bleeding edge builds of both Xtend and Xcore,
> but now the Xcore editor refuses to start, and shows a whole bunch of
> these exceptions:
>
>
> ..
> Caused by: com.google.inject.internal.util.$ComputationException:
> com.google.inject.internal.util.$ComputationException:
> java.lang.NoClassDefFoundError:
> org/eclipse/xtext/xbase/services/XbaseGrammarAccess$StaticQualifierElements
> at
> com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:553)
> at
> com.google.inject.internal.util.$MapMaker$StrategyImpl.compute(MapMaker.java:419)
> at
> com.google.inject.internal.util.$CustomConcurrentHashMap$ComputingImpl.get(CustomConcurrentHashMap.java:2041)
> at
> com.google.inject.internal.FailableCache.get(FailableCache.java:50)
> at
> com.google.inject.internal.ConstructorInjectorStore.get(ConstructorInjectorStore.java:49)
> at
> com.google.inject.internal.ConstructorBindingImpl.initialize(ConstructorBindingImpl.java:125)
> at
> com.google.inject.internal.InjectorImpl.initializeJitBinding(InjectorImpl.java:521)
> ..
>

Re: Strange error &quot;Cannot find compatible feature ... in sealed EClass&quot; [message #1061311 is a reply to message #1061294]

Fri, 31 May 2013 03:34

Eclipse User

I have Xcore 1.1.0.v20130528-0809 together with Xbase/Xtext/Xtend 2.4.2.201305301254. I installed using

http://download.eclipse.org/modeling/emf/emf/updates/nightly/
http://download.eclipse.org/modeling/tmf/xtext/updates/composite/latest/

Re: Strange error &quot;Cannot find compatible feature ... in sealed EClass&quot; [message #1061317 is a reply to message #1061311]

Fri, 31 May 2013 04:01

Eclipse User

I just upgraded to Xcore 1.1.0.v20130529-2030 and Xbase 2.4.2.v201305310201, with the same result.

Do I need to upgrade my target platform as well? (Sorry for maybe asking obvious questions.)

Re: Strange error &amp;quot;Cannot find compatible feature ... in sealed EClass&amp; [message #1061386 is a reply to message #1061317]

Fri, 31 May 2013 08:19

Eclipse User

Am 31.05.13 10:01, schrieb Jesper Eskilson:
> I just upgraded to Xcore 1.1.0.v20130529-2030 and Xbase
> 2.4.2.v201305310201, with the same result.
>
> Do I need to upgrade my target platform as well? (Sorry for maybe asking
> obvious questions.)

Hi Jepser,

I'd assume the Xcore build from 201305129 does not contain the changes
that Ed mentioned. Can you try a more recent build?

Regards,
Sebastian
--
Looking for professional support for Xtext, Xtend or Eclipse Modeling?
Go visit: http://xtext.itemis.com

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