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Bug 322434

Summary: File extensions with uppercase characters cause a java.lang.IllegalStateException
Product: [Modeling] TMF Reporter: Harald M <harald.m>
Component: XtextAssignee: Project Inbox <tmf.xtext-inbox>
Status: CLOSED FIXED QA Contact:
Severity: minor    
Priority: P3 CC: jan, sebastian.zarnekow
Version: unspecifiedFlags: sebastian.zarnekow: helios+
Target Milestone: SR1   
Hardware: PC   
OS: Windows XP   
Whiteboard:

Description Harald M CLA 2010-08-11 16:49:00 EDT 
Build Identifier: Xtext SDK 1.0.0.v201006170321

Given a file extension like ".mydsl" (all lowercase) is registered for an Xtext file.
Double click on a file named "test.myDsl" (file extension contains uppercase characters) causes the following exceptions:

java.lang.IllegalStateException: The resource factory registered for platform:/resource/Asdgv/Demo.myDsl does not yield an XtextResource. Make sure the right resource factory has been registered.
	at org.eclipse.xtext.ui.editor.model.ResourceForIEditorInputFactory.createResource(ResourceForIEditorInputFactory.java:77)
	at org.eclipse.xtext.ui.editor.model.ResourceForIEditorInputFactory.createResourceFor(ResourceForIEditorInputFactory.java:69)
	at org.eclipse.xtext.ui.editor.model.ResourceForIEditorInputFactory.createResource(ResourceForIEditorInputFactory.java:61)
	at org.eclipse.xtext.ui.editor.model.JavaClassPathResourceForIEditorInputFactory.createResource(JavaClassPathResourceForIEditorInputFactory.java:37)
	at org.eclipse.xtext.ui.editor.model.ResourceForIEditorInputFactory.createResource(ResourceForIEditorInputFactory.java:49)
	at org.eclipse.xtext.ui.editor.model.XtextDocumentProvider.setDocumentContent(XtextDocumentProvider.java:102)
	at org.eclipse.ui.editors.text.StorageDocumentProvider.createDocument(StorageDocumentProvider.java:229)
	at org.eclipse.ui.editors.text.FileDocumentProvider.createElementInfo(FileDocumentProvider.java:735)
	at org.eclipse.xtext.ui.editor.model.XtextDocumentProvider.createElementInfo(XtextDocumentProvider.java:131)
	at org.eclipse.ui.texteditor.AbstractDocumentProvider.connect(AbstractDocumentProvider.java:400)
	at org.eclipse.ui.texteditor.AbstractTextEditor.doSetInput(AbstractTextEditor.java:4050)
	at org.eclipse.ui.texteditor.StatusTextEditor.doSetInput(StatusTextEditor.java:217)
	at org.eclipse.ui.texteditor.AbstractDecoratedTextEditor.doSetInput(AbstractDecoratedTextEditor.java:1444)
	at org.eclipse.ui.editors.text.TextEditor.doSetInput(TextEditor.java:169)
	at org.eclipse.xtext.ui.editor.XtextEditor.doSetInput(XtextEditor.java:149)
	at org.eclipse.ui.texteditor.AbstractTextEditor$19.run(AbstractTextEditor.java:3037)
	at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:464)
	at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:372)
	at org.eclipse.jface.window.ApplicationWindow$1.run(ApplicationWindow.java:759)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.jface.window.ApplicationWindow.run(ApplicationWindow.java:756)
	at org.eclipse.ui.internal.WorkbenchWindow.run(WorkbenchWindow.java:2600)
	at org.eclipse.ui.texteditor.AbstractTextEditor.internalInit(AbstractTextEditor.java:3055)
	at org.eclipse.ui.texteditor.AbstractTextEditor.init(AbstractTextEditor.java:3082)
	at org.eclipse.xtext.ui.editor.XtextEditor.init(XtextEditor.java:169)
	at org.eclipse.ui.internal.EditorManager.createSite(EditorManager.java:798)
	at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:647)
	at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:465)
	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
	at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:289)
	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2863)
	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2768)
	at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2760)
	at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2711)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2707)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2691)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2682)
	at org.eclipse.ui.ide.IDE.openEditor(IDE.java:651)
	at org.eclipse.ui.ide.IDE.openEditor(IDE.java:610)
	at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:365)
	at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:168)
	at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:229)
	at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:208)
	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:274)
	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:250)
	at org.eclipse.jdt.internal.ui.navigator.OpenAndExpand.run(OpenAndExpand.java:49)
	at org.eclipse.ui.actions.RetargetAction.run(RetargetAction.java:221)
	at org.eclipse.ui.navigator.CommonNavigatorManager$3.open(CommonNavigatorManager.java:185)
	at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHelper.java:48)
	at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:845)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
	at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:843)
	at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1131)
	at org.eclipse.ui.navigator.CommonViewer.handleOpen(CommonViewer.java:462)
	at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1235)
	at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:264)
	at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:258)
	at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:298)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4066)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2629)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2593)
	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2427)
	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:670)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:663)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1407)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1383)


Reproducible: Always

Steps to Reproduce:
1. Create example project (mydsl) and generate the plugins.
2. Run as Eclipse Application
3. Create a file "anything.myDsL" and double click
Comment 1 Jan Koehnlein CLA 2010-08-12 03:05:02 EDT 
I guess hat is not a plain Xtext problem: EMF chooses the implementation of the Resource interface that is capable of parsing/serializing the content of a file into an EMF object model by asking the Resource.Factory.Registry with a given URI. In case of  workspace resource, this will be a "platform:/resource/..." URI.
URIs were never and have never been case insensitve. 

What's happening in your case is that as the file extension does not match a default resource implementation is chosen that is incapable of parsing your language. Many file systems are case sensitive. 

Xtext registers its own Resource.Factory in the plugin.xml of the language project and in the StandaloneSetup of class of your language. A workaround would be to additionally register the same Resource.Factory for all upper/lower case combinations of the file extension. Alternatively, you could bind the factory to a content type instead of a file extension. See the eclipse documentation for more details on content types.
Comment 2 Sebastian Zarnekow CLA 2010-08-12 03:57:28 EDT 
We should improve the error message.
Comment 3 Jan Koehnlein CLA 2010-08-19 05:19:59 EDT 
Improved error message.

If your extensions are short consider setting all case combinations as file extensions in the MWE2 workflow. This will be the easiest workaround.

I've added another bug targeting further improvement
https://bugs.eclipse.org/bugs/show_bug.cgi?id=323113
Comment 4 Karsten Thoms CLA 2017-09-19 16:09:48 EDT 
Closing bug which were set to RESOLVED before Eclipse Neon.0.