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Bug with EcoreGeneratorFragment in xtext 2.4M5? [message #1015560]

Fri, 01 March 2013 09:04

Victor Noël

Messages: 112
Registered: June 2010

Senior Member

Hi,

I'm trying to work on a language based on xbase and another metamodel I wrote, which refers to JavaVMTypes.

My language refers to things from Xtypes and JavaVMTypes.

When the EcoreGeneratorFragment is executed I get this error:

java.lang.NullPointerException
	at org.eclipse.emf.codegen.ecore.genmodel.impl.GenPackageImpl.hasExtendedMetaData(GenPackageImpl.java:4417)
	at org.eclipse.emf.codegen.ecore.genmodel.impl.GenPackageImpl.initialize(GenPackageImpl.java:2807)
	at org.eclipse.emf.codegen.ecore.genmodel.impl.GenModelImpl.initialize(GenModelImpl.java:2317)
	at org.eclipse.xtext.generator.ecore.EcoreGeneratorFragment.getSaveAndReconcileGenModel(EcoreGeneratorFragment.java:666)
	at org.eclipse.xtext.generator.ecore.EcoreGeneratorFragment.generate(EcoreGeneratorFragment.java:220)
	at org.eclipse.xtext.generator.CompositeGeneratorFragment.generate(CompositeGeneratorFragment.java:92)
	at org.eclipse.xtext.generator.LanguageConfig.generate(LanguageConfig.java:113)
	at org.eclipse.xtext.generator.Generator.generate(Generator.java:361)
	at org.eclipse.xtext.generator.Generator.invokeInternal(Generator.java:128)
	at org.eclipse.emf.mwe.core.lib.AbstractWorkflowComponent.invoke(AbstractWorkflowComponent.java:126)
	at org.eclipse.emf.mwe.core.lib.Mwe2Bridge.invoke(Mwe2Bridge.java:34)
	at org.eclipse.emf.mwe.core.lib.AbstractWorkflowComponent.invoke(AbstractWorkflowComponent.java:201)
	at org.eclipse.emf.mwe2.runtime.workflow.AbstractCompositeWorkflowComponent.invoke(AbstractCompositeWorkflowComponent.java:35)
	at org.eclipse.emf.mwe2.runtime.workflow.Workflow.run(Workflow.java:19)
	at org.eclipse.emf.mwe2.launch.runtime.Mwe2Runner.run(Mwe2Runner.java:102)
	at org.eclipse.emf.mwe2.launch.runtime.Mwe2Runner.run(Mwe2Runner.java:62)
	at org.eclipse.emf.mwe2.launch.runtime.Mwe2Runner.run(Mwe2Runner.java:52)
	at org.eclipse.emf.mwe2.launch.runtime.Mwe2Launcher.run(Mwe2Launcher.java:74)
	at org.eclipse.emf.mwe2.launch.runtime.Mwe2Launcher.main(Mwe2Launcher.java:35)

I did a bit of debug, and the problem is that on line 4437 of GenPackageImpl, when looking for the ePackage of the references, at one point the eCrossReference is, I don't know why, a proxy to a EClass of JavaVMTypes and not a direct reference as with the other references.
And this proxy seems to return null for getEPackage(), which results on the NPE happening later.

Maybe something is wrong in my code, so I'm going to check again, but I'm not sure that behaviour is wanted when such a situation happens :)

Thanks!

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Re: Bug with EcoreGeneratorFragment in xtext 2.4M5? [message #1015563 is a reply to message #1015560]

Fri, 01 March 2013 09:07

Victor Noël

Messages: 112
Registered: June 2010

Senior Member

I found the problem, in the ecore file referencing JavaVMTypes, I got something like that:

<eStructuralFeatures xsi:type="ecore:EReference" name="typeParameters" upperBound="-1"
        eType="ecore:EClass platform:/plugin/org.eclipse.xtext.common.types/model/JavaVMTypes.ecore#//JvmTypeParameter"
        containment="true"/>

instead of:

<eStructuralFeatures xsi:type="ecore:EReference" name="typeParameters" upperBound="-1"
        eType="ecore:EClass platform:/resource/org.eclipse.xtext.common.types/model/JavaVMTypes.ecore#//JvmTypeParameter"
        containment="true"/>

Anyway, the error is maybe not normal?

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Re: Bug with EcoreGeneratorFragment in xtext 2.4M5? [message #1015565 is a reply to message #1015563]

Fri, 01 March 2013 09:09

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi,

did you try to add a uri map from platform:/plugin/..... to platform:/resource ...... to the StandaloneSetup?

~Christian

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Bug with EcoreGeneratorFragment in xtext 2.4M5? [message #1015579 is a reply to message #1015565]

Fri, 01 March 2013 09:29

Victor Noël

Messages: 112
Registered: June 2010

Senior Member

Yes, I think that would work too, but I am more worried about the way the error is reported and the fact that it happens, than I am worried about how to solve it (since I could solve it :)

Thank you!

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Re: Bug with EcoreGeneratorFragment in xtext 2.4M5? [message #1016095 is a reply to message #1015563]

Mon, 04 March 2013 23:43

Sebastian Zarnekow

Messages: 3118
Registered: July 2009

Senior Member

Am 01.03.13 10:07, schrieb Victor Mising name:
> I found the problem, in the ecore file referencing JavaVMTypes, I got
> something like that:
>
>
> <eStructuralFeatures xsi:type="ecore:EReference" name="typeParameters"
> upperBound="-1"
> eType="ecore:EClass
> platform:/plugin/org.eclipse.xtext.common.types/model/JavaVMTypes.ecore#//JvmTypeParameter"
>
> containment="true"/>
>
>
> instead of:
>
>
> <eStructuralFeatures xsi:type="ecore:EReference" name="typeParameters"
> upperBound="-1"
> eType="ecore:EClass
> platform:/resource/org.eclipse.xtext.common.types/model/JavaVMTypes.ecore#//JvmTypeParameter"
>
> containment="true"/>
>
>
> Anyway, the error is maybe not normal?

Where did you find the reference to platform:/plugin? Is it in your own
Ecore package or in one file that is shipped with Xtext?
Nevertheless, you may want to register a URI mapping in order to fix that.

Regards,
Sebastian
--
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