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Re: [incquery-dev] Xtext compatibility problem
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Hi,
ignore the conclusions about compatibility; the same issue was reproducible over Xtext 2.5-built IncQuery instance as well. However, I don't know exactly what caused this issue, but it came while asking for content assist inside check expressions (I don't know whether any other conditions are required for this bug).
Cheers,
Zoli
-- Zoltán Ujhelyi
https://www.inf.mit.bme.hu/en/members/ujhelyiz
Fault Tolerant Systems Research Group
Budapest University of Technology and Economics
On 2014.04.10., at 19:14, Ujhelyi Zoltán <ujhelyiz@xxxxxxxxxx> wrote:
> Hi,
>
> today I have seen a strange classcastexception from the internals of XbaseGrammarAccess (see the end of the mail for the concrete trace), that caused the entire code generator stop working.
>
> After some evaluation, I realized the issue was that I used Xtext 2.5 with the latest installable version (compiled with Xtext 2.4). As an experiment, I have replaced the installed IncQuery version with the one compiled by the job https://hudson.eclipse.org/incquery/job/incquery-xcore/ (with Xtext 2.5), and this issue went away.
>
> Alltogether, this means, we have source compatibility between Xtext 2.4 and 2.5 (IncQuery work fine with both), but needs to be compiled with the corresponding Xtext version. This does not mean we have to change our support plans (we can compile both versions automatically), just something we should be very careful about.
>
> Cheers,
> Zoli
> -- Zoltán Ujhelyi
> https://www.inf.mit.bme.hu/en/members/ujhelyiz
>
> Fault Tolerant Systems Research Group
> Budapest University of Technology and Economics
>
>
> Caused by: java.lang.ClassCastException: org.eclipse.xtext.impl.AlternativesImpl cannot be cast to org.eclipse.xtext.Group
> at org.eclipse.xtext.xbase.services.XtypeGrammarAccess$JvmTypeParameterElements.<init>(XtypeGrammarAccess.java:344)
> at org.eclipse.xtext.xbase.services.XtypeGrammarAccess.getJvmTypeParameterAccess(XtypeGrammarAccess.java:694)
> at org.eclipse.xtext.xbase.services.XbaseGrammarAccess.getJvmTypeParameterAccess(XbaseGrammarAccess.java:3804)
> at org.eclipse.incquery.patternlanguage.services.PatternLanguageGrammarAccess.getJvmTypeParameterAccess(PatternLanguageGrammarAccess.java:2563)
> at org.eclipse.incquery.patternlanguage.emf.services.EMFPatternLanguageGrammarAccess.getJvmTypeParameterAccess(EMFPatternLanguageGrammarAccess.java:1659)
> at org.eclipse.incquery.patternlanguage.emf.ui.contentassist.antlr.EMFPatternLanguageParser$1.<init>(EMFPatternLanguageParser.java:82)
> at org.eclipse.incquery.patternlanguage.emf.ui.contentassist.antlr.EMFPatternLanguageParser.getRuleName(EMFPatternLanguageParser.java:37)
> at org.eclipse.xtext.ui.editor.contentassist.antlr.AbstractContentAssistParser.getFollowElements(AbstractContentAssistParser.java:67)
> at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.computeFollowElements(ParserBasedContentAssistContextFactory.java:463)
> at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.computeFollowElements(ParserBasedContentAssistContextFactory.java:401)
> at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.computeFollowElements(ParserBasedContentAssistContextFactory.java:395)
> at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.doCreateContexts(ParserBasedContentAssistContextFactory.java:345)
> at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.createContextsForLastCompleteNode(ParserBasedContentAssistContextFactory.java:325)
> at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.handleLastCompleteNodeIsPartOfLookahead(ParserBasedContentAssistContextFactory.java:259)
> at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.doCreateContexts(ParserBasedContentAssistContextFactory.java:225)
> at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.create(ParserBasedContentAssistContextFactory.java:200)
> at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory.create(ParserBasedContentAssistContextFactory.java:644)
> at org.eclipse.xtext.ui.editor.contentassist.CompletionProposalComputer.exec(CompletionProposalComputer.java:48)
> at org.eclipse.xtext.ui.editor.contentassist.CompletionProposalComputer.exec(CompletionProposalComputer.java:1)
> at org.eclipse.xtext.util.concurrent.AbstractReadWriteAcces.readOnly(AbstractReadWriteAcces.java:62)
> at org.eclipse.xtext.ui.editor.model.XtextDocument$XtextDocumentLocker.readOnly(XtextDocument.java:243)
> at org.eclipse.xtext.ui.editor.model.XtextDocument.readOnly(XtextDocument.java:84)
> at org.eclipse.xtext.ui.editor.contentassist.XtextContentAssistProcessor.computeCompletionProposals(XtextContentAssistProcessor.java:68)
> at org.eclipse.xtext.ui.editor.contentassist.RepeatedContentAssistProcessor.computeCompletionProposals(RepeatedContentAssistProcessor.java:75)
> at org.eclipse.jface.text.contentassist.ContentAssistant.computeCompletionProposals(ContentAssistant.java:1839)
> at org.eclipse.jface.text.contentassist.CompletionProposalPopup.computeProposals(CompletionProposalPopup.java:566)
> at org.eclipse.jface.text.contentassist.CompletionProposalPopup.access$16(CompletionProposalPopup.java:563)
> at org.eclipse.jface.text.contentassist.CompletionProposalPopup$2.run(CompletionProposalPopup.java:498)
> at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
> at org.eclipse.jface.text.contentassist.CompletionProposalPopup.showProposals(CompletionProposalPopup.java:492)
> at org.eclipse.jface.text.contentassist.ContentAssistant$2.run(ContentAssistant.java:378)
> at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
> at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
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