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This seems to be related to the change in XtextResourceSet, that throws an exception if another reosurce is loaded with the URI of an already loaded one. Steps to reproduce: Run the "GenerateAllLanuages.mwe2" workflox in org.eclipe.xtext.tests and watch what happens to EcoreFragmentTestLanguage: 25678 INFO LanguageConfig - generating infrastructure for org.eclipse.xtext.generator.ecore.EcoreFragmentTestLanguage with fragments : ImplicitRuntimeFragment, XtextAntlrGeneratorFragment, DebugAntlrGeneratorFragment, ResourceFactoryFragment, GrammarAccessFragment, EcoreGeneratorFragment, ParseTreeConstructorFragment, SerializerFragment 25921 INFO GenModelHelper - Registered GenModel 'http://first' from 'platform:/resource/org.eclipse.xtext.tests/src/org/eclipse/xtext/generator/ecore/Genmodel.genmodel' java.lang.IllegalStateException: A resource with the normalized URI 'platform:/resource/org.eclipse.xtext.tests/src-gen/org/eclipse/xtext/generator/ecore/EcoreFragmentTestLanguage.ecore' was already registered. The resource with the URI 'org.eclipse.emf.ecore.xmi.impl.EcoreResourceFactoryImpl$1@4c7ef8a6 uri='platform:/resource/org.eclipse.xtext.tests/src-gen/org/eclipse/xtext/generator/ecore/EcoreFragmentTestLanguage.ecore'' is no longer registered with the normalized form. at org.eclipse.xtext.resource.XtextResourceSet.registerURI(XtextResourceSet.java:75) at org.eclipse.xtext.resource.XtextResourceSet$ResourcesList.inverseAdd(XtextResourceSet.java:95) at org.eclipse.xtext.resource.XtextResourceSet$ResourcesList.inverseAdd(XtextResourceSet.java:1) at org.eclipse.emf.common.notify.impl.NotifyingListImpl.addUnique(NotifyingListImpl.java:312) at org.eclipse.emf.common.util.AbstractEList.add(AbstractEList.java:301) at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.createResource(ResourceSetImpl.java:435) at org.eclipse.xtext.generator.ecore.EcoreGeneratorFragment.createResourceForEPackages(EcoreGeneratorFragment.java:138) at org.eclipse.xtext.generator.ecore.EcoreGeneratorFragment.generate(EcoreGeneratorFragment.java:217) at org.eclipse.xtext.generator.CompositeGeneratorFragment.generate(CompositeGeneratorFragment.java:92) 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:79) at org.eclipse.emf.mwe2.launch.runtime.Mwe2Runner.run(Mwe2Runner.java:71) at org.eclipse.emf.mwe2.launch.runtime.Mwe2Launcher.run(Mwe2Launcher.java:76) at org.eclipse.emf.mwe2.launch.runtime.Mwe2Launcher.main(Mwe2Launcher.java:35) 25973 ERROR CompositeGeneratorFragment - Could not find a GenModel for EPackage 'http://www.eclipse.org/2009/tmf/xtext/EcoreFragmentTestLanguage' from http://www.eclipse.org/2009/tmf/xtext/EcoreFragmentTestLanguage If the missing GenModel has been generated via EcoreGeneratorFragment make sure to run it first in the workflow. If you have a *.genmodel-file, make sure to register it via StandaloneSetup.registerGenModelFile(String) java.lang.RuntimeException: Could not find a GenModel for EPackage 'http://www.eclipse.org/2009/tmf/xtext/EcoreFragmentTestLanguage' from http://www.eclipse.org/2009/tmf/xtext/EcoreFragmentTestLanguage If the missing GenModel has been generated via EcoreGeneratorFragment make sure to run it first in the workflow. If you have a *.genmodel-file, make sure to register it via StandaloneSetup.registerGenModelFile(String) at org.eclipse.xtext.generator.GenModelAccess.getGenModelResource(GenModelAccess.java:119) at org.eclipse.xtext.generator.GenModelAccess.getGenPackage(GenModelAccess.java:85) at org.eclipse.xtext.generator.serializer.JavaEMFFile.importedGenTypeName(JavaEMFFile.java:100) at org.eclipse.xtext.generator.serializer.JavaEMFFile.importedGenTypeLiteral(JavaEMFFile.java:69) at org.eclipse.xtext.generator.serializer.AbstractSemanticSequencer.genMethodCreateSequence(AbstractSemanticSequencer.java:305) at org.eclipse.xtext.generator.serializer.AbstractSemanticSequencer.getFileContents(AbstractSemanticSequencer.java:217) at org.eclipse.xtext.generator.serializer.SerializerFragment.generate(SerializerFragment.java:92) at org.eclipse.xtext.generator.Xtend2GeneratorFragment.generate(Xtend2GeneratorFragment.java:66) at org.eclipse.xtext.generator.Xtend2GeneratorFragment.generate(Xtend2GeneratorFragment.java:59) at org.eclipse.xtext.generator.CompositeGeneratorFragment.generate(CompositeGeneratorFragment.java:92) 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:79) at org.eclipse.emf.mwe2.launch.runtime.Mwe2Runner.run(Mwe2Runner.java:71) at org.eclipse.emf.mwe2.launch.runtime.Mwe2Launcher.run(Mwe2Launcher.java:76) at org.eclipse.emf.mwe2.launch.runtime.Mwe2Launcher.main(Mwe2Launcher.java:35)
