Some Eclipse Foundation services are deprecated, or will be soon. Please ensure you've read this important communication.

Bug 355935

Summary:	ClassCastException during Import-Linking while editing big xtend-files with many imports
Product:	[Modeling] TMF	Reporter:	Florian Quadt <f.quadt>
Component:	Xtext	Assignee:	Project Inbox <tmf.xtext-inbox>
Status:	CLOSED FIXED	QA Contact:
Severity:	major
Priority:	P3	CC:	sebastian.zarnekow
Version:	unspecified	Flags:	sebastian.zarnekow: indigo+
Target Milestone:	SR2
Hardware:	PC
OS:	Windows 7
Whiteboard:

Description Florian Quadt

2011-08-26 07:15:46 EDT

Build Identifier: I20110603-0909

while editing files with many imports a ClassCastException occurs if linking is triggered. It seems to be dependent on import resolution (this is at least what I understand from stacktrace). It is unclear which cast causes this exception because the WrappedException don't give further information about the class (don't print the error message of ClassCastException).

Sadly, I was unable to identify if a specific import causes this error.
Once the error occurs I am unable to edit the file. Even element deletion and copy causes this error.

It seems that one of the casts from a EcoreUtil.getAllContents(...) to a specific type is the cause.

It would be nice to make these casts typesafe and add the error message to the wrapper exception.

Best Regards,

Florian Quadt

additional build info:
- happens sometimes in 2.0.1
- happens a lot in Nightly 2.0.1.v201108151710 for big files at some point
- I cannot check newer versions because of other issues

--------------
stacktrace:
--------------
org.eclipse.xtext.linking.lazy.LazyLinkingResource  - resolution of uriFragment 'xtextLink_::0.1.6.12.4.0.0.6.0.1.6::0::/2' failed.
java.lang.ClassCastException
.
An internal error occurred during: "Updating editor state".
org.eclipse.emf.common.util.WrappedException: java.lang.ClassCastException
 at org.eclipse.xtext.linking.lazy.LazyLinkingResource.getEObject(LazyLinkingResource.java:206)
 at org.eclipse.xtext.xtend2.resource.Xtend2Resource.getEObject(Xtend2Resource.java:75)
 at org.eclipse.xtext.linking.lazy.LazyLinkingResource.resolveLazyCrossReference(LazyLinkingResource.java:143)
 at org.eclipse.xtext.linking.lazy.LazyLinkingResource.resolveLazyCrossReferences(LazyLinkingResource.java:104)
 at org.eclipse.xtext.EcoreUtil2.resolveLazyCrossReferences(EcoreUtil2.java:435)
 at org.eclipse.xtext.resource.impl.DefaultResourceDescription.getImportedNames(DefaultResourceDescription.java:95)
 at org.eclipse.xtext.resource.impl.DefaultResourceDescriptionManager.getImportedNames(DefaultResourceDescriptionManager.java:99)
 at org.eclipse.xtext.resource.impl.DefaultResourceDescriptionManager.isAffected(DefaultResourceDescriptionManager.java:95)
 at org.eclipse.xtext.ui.editor.DirtyStateEditorSupport.isReparseRequired(DirtyStateEditorSupport.java:425)
 at org.eclipse.xtext.ui.editor.DirtyStateEditorSupport$UpdateEditorStateJob$1.exec(DirtyStateEditorSupport.java:124)
 at org.eclipse.xtext.ui.editor.DirtyStateEditorSupport$UpdateEditorStateJob$1.exec(DirtyStateEditorSupport.java:1)
 at org.eclipse.xtext.util.concurrent.AbstractReadWriteAcces.readOnly(AbstractReadWriteAcces.java:32)
 at org.eclipse.xtext.ui.editor.model.XtextDocument.readOnly(XtextDocument.java:86)
 at org.eclipse.xtext.ui.editor.DirtyStateEditorSupport$UpdateEditorStateJob.run(DirtyStateEditorSupport.java:117)
 at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: java.lang.ClassCastException

Reproducible: Sometimes

Steps to Reproduce:
I have no idea how to reproduce this error. It occurs on some xtend files, but they have nothing in common, except long lists of imports
1. create a xtend-file 
2. add some import statement (xtend and java)
3. edit the file

Comment 1 Sebastian Zarnekow

2011-08-26 07:17:57 EDT

Did you truncate the stacktrace?

Comment 2 Florian Quadt

2011-08-26 07:57:45 EDT

(In reply to comment #1)
> Did you truncate the stacktrace?

No. That's all what I have.
While editing the file a Eclipse ErrorDialog opens that doesn't contain useful information except something like "ClassCastException". I got the stacktrace from the eclipseErrorLog and that's all I have.

Comment 3 Sebastian Zarnekow

2011-08-26 08:33:13 EDT

Could you please set a breakpoint in the exception handler of LazyLinkingResource.getEObject and add the stack of the class cast exception here?

Comment 4 Florian Quadt

2011-09-17 05:23:50 EDT

(In reply to comment #3)
> Could you please set a breakpoint in the exception handler of
> LazyLinkingResource.getEObject and add the stack of the class cast exception
> here?

Hi Sebastian,

since the latest stable the ClassCastException does not happen anymore.
I cannot guarantee that this is fixed, since this error only occurs infrequently.
But I hope it disappeared. So I change to "resolved fixed" and will reopen if it happens again.
Thanks for your assistance,

Florian

Comment 5 Karsten Thoms

2017-09-19 17:24:21 EDT

Closing all bugs that were set to RESOLVED before Neon.0

Comment 6 Karsten Thoms

2017-09-19 17:36:02 EDT

Closing all bugs that were set to RESOLVED before Neon.0