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JvmType Reference in XText DSL based on XCore model [Luna] [message #1401223]

Tue, 15 July 2014 09:58

Johannes Wachter

Messages: 5
Registered: June 2013

Junior Member

Hello,

I'm currently building a DSL with XText that is based on a XCore model. This was previously still based on Eclipse Juno (XCore 1.0.x, XText 2.4.x) and now I'm trying to update to Eclipse Luna (XCore 1.2.x, XText 2.6.x).

With the Juno variant the usage of JvmType in both the XCore model and the XText grammar worked fine.

When updating to Luna I get errors that the expected type JvmType is not compatible with the type JvmType (detailed error see example below).

I also created a simple example with a fresh XCore project and a fresh XText DSL like the following:

XCore

package appmodel

import org.eclipse.xtext.common.types.JvmType

class Foo {
	String foobar
	refers JvmType javaClass
}

XText Grammar

grammar appdsl.AppDsl with org.eclipse.xtext.common.Terminals

import "appmodel"
import "http://www.eclipse.org/xtext/common/JavaVMTypes" as jvmTypes

Foo:
	{Foo}
	'type' foobar=STRING '>' javaClass=[jvmTypes::JvmType]
;

Though the XText grammar yields the following error at the assignment of the javaClass feature:

Cannot find compatible feature javaClass in sealed EClass Foo from imported package appmodel: The existing reference 'javaClass' has an incompatible type 'JvmType'. The expected type is 'JvmType'.

I'm currently unsure why this worked in the Juno based version before, any ideas?

I also attached my test project, which has been checked in a Luna RCP with XCore 1.2.0 and XText 2.6.2.

Attachment: xcore-xtext-jvmtype.zip
(Size: 1.47MB, Downloaded 128 times)

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Re: JvmType Reference in XText DSL based on XCore model [Luna] [message #1401245 is a reply to message #1401223]

Tue, 15 July 2014 10:37

Christian Dietrich

Messages: 13264
Registered: July 2009

Senior Member

did you have a look at http://koehnlein.blogspot.de/2013/06/using-xcore-in-xtext.html?

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Re: JvmType Reference in XText DSL based on XCore model [Luna] [message #1401265 is a reply to message #1401245]

Tue, 15 July 2014 11:15

Johannes Wachter

Messages: 5
Registered: June 2013

Junior Member

Hi Christian,

yes I actually used that article as the base for the upgrade, together with the info from the following bugzillas:

https://bugs.eclipse.org/bugs/show_bug.cgi?id=379999
https://bugs.eclipse.org/bugs/show_bug.cgi?id=412429

I just ran the generator again an at generation time the following error is thrown:

145  [main] INFO  lipse.emf.mwe.utils.StandaloneSetup  - Adding generated EPackage 'org.eclipse.xtext.xbase.XbasePackage'
266  [main] INFO  clipse.emf.mwe.utils.GenModelHelper  - Registered GenModel 'http://www.eclipse.org/Xtext/Xbase/XAnnotations' from 'platform:/resource/org.eclipse.xtext.xbase/model/Xbase.genmodel'
269  [main] INFO  clipse.emf.mwe.utils.GenModelHelper  - Registered GenModel 'http://www.eclipse.org/xtext/xbase/Xtype' from 'platform:/resource/org.eclipse.xtext.xbase/model/Xbase.genmodel'
280  [main] INFO  clipse.emf.mwe.utils.GenModelHelper  - Registered GenModel 'http://www.eclipse.org/xtext/xbase/Xbase' from 'platform:/resource/org.eclipse.xtext.xbase/model/Xbase.genmodel'
280  [main] INFO  clipse.emf.mwe.utils.GenModelHelper  - Registered GenModel 'http://www.eclipse.org/xtext/common/JavaVMTypes' from 'platform:/resource/org.eclipse.xtext.common.types/model/JavaVMTypes.genmodel'
1123 [main] ERROR ipse.xtext.generator.LanguageConfig  - Error loading 'platform:/resource/appmodel/model/appmodel.xcore': [XtextLinkingDiagnostic: null:7 Couldn't resolve reference to GenBase 'JvmType'.]
1993 [main] ERROR ipse.xtext.generator.LanguageConfig  - [TransformationDiagnostic: null:8 Cannot find compatible feature javaClass in sealed EClass Foo from imported package appmodel: The existing feature 'javaClass' has an incompatible type 'EJavaObject' [java.lang.Object]. The expected type is 'JvmType' [org.eclipse.xtext.common.types.JvmType]. (ErrorCode: CannotCreateTypeInSealedMetamodel)]

This seems very odd to me as the genmodel for JvmTypes is registered (see log) before it is not found anymore. What is also strange, is that here the last line indicates that EJavaObject has been found as the type of the javaClass feature whereas the IDE integration states something different.

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Re: JvmType Reference in XText DSL based on XCore model [Luna] [message #1401365 is a reply to message #1401265]

Tue, 15 July 2014 13:43

Christian Dietrich

Messages: 13264
Registered: July 2009

Senior Member

can you file a bugzilla?

Need professional support for Xtext, Xpand, EMF?
Go to: https://www.itemis.com/en/xtext/
Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: JvmType Reference in XText DSL based on XCore model [Luna] [message #1401411 is a reply to message #1401365]

Tue, 15 July 2014 15:19

Johannes Wachter

Messages: 5
Registered: June 2013

Junior Member

Sure, I'll do that tomorrow since it seems that it still works when exporting the *.xcore to a *.ecore.

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Re: JvmType Reference in XText DSL based on XCore model [Luna] [message #1401926 is a reply to message #1401411]

Wed, 16 July 2014 09:02

Csaba Koncz

Messages: 49
Registered: July 2009

Member

Hi,
Here is the bugreport:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=439682

However, it is only about the errors displayed in the editor as the mwe2 workflow can be executed if a

loadedResource = "platform:/resource/org.eclipse.xtext.common.types/model/JavaVMTypes.genmodel"

is specified.
Best regards,
Csaba

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Re: JvmType Reference in XText DSL based on XCore model [Luna] [message #1401935 is a reply to message #1401411]

Wed, 16 July 2014 09:15

Csaba Koncz

Messages: 49
Registered: July 2009

Member

Hi,
Here is the bugreport:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=439682

However, it is only about the errors shown in the editor, as the mwe2 workflow can be executed, if a

loadedResource = "platform:/resource/org.eclipse.xtext.common.types/model/JavaVMTypes.genmodel"

is added.

Best regards,
Csaba

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