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Bug 358805

Summary:	ClassCastException in XbaseProposalProvider
Product:	[Modeling] TMF	Reporter:	Kai Kreuzer <kai>
Component:	Xtext	Assignee:	Project Inbox <tmf.xtext-inbox>
Status:	CLOSED WORKSFORME	QA Contact:
Severity:	normal
Priority:	P3	CC:	Holger.Schill, sebastian.zarnekow
Version:	unspecified
Target Milestone:	---
Hardware:	Macintosh
OS:	Mac OS X - Carbon (unsup.)
Whiteboard:

Description Kai Kreuzer

2011-09-24 16:11:25 EDT

Build Identifier: Xtext v2.0.1

I have defined a grammar that uses Xbase.
When using the generated editor and the proposal feature at a place where an Xbase expression is expected, I get the following ClassCastException:


java.lang.ClassCastException: my.package.MyScopeProvider cannot be cast to org.eclipse.xtext.xbase.scoping.XbaseScopeProvider
	at org.eclipse.xtext.xbase.ui.contentassist.XbaseProposalProvider.getScopeProvider(XbaseProposalProvider.java:214)

This is true, because the generated MyScopeProvider extends AbstractDeclarativeScopeProvider but not XbaseProposalProvider.



Reproducible: Always

Steps to Reproduce:
1. create a grammar using xbase
2. use the proposal feature of the generated editor

Comment 1 Kai Kreuzer

2011-09-24 16:13:05 EDT

Sorry, the last sentence of course should have read "[...] but not XbaseScopeProvider".

Comment 2 Holger Schill

2011-09-29 03:12:07 EDT

The ScopeProvider of your language should extend XbaseProposalProvider.
After integrating Xbase this step could not be done automatically because your ScopeProvider is a generate ones artefact.

Comment 3 Kai Kreuzer

2011-09-29 15:15:42 EDT

When extending XbaseScopeProvider myself, I get a discouraged access warning (as the according package is only exported to a list of defined friends). Would it be possible to remove this export restriction?

Comment 4 Sebastian Zarnekow

2011-09-29 16:43:39 EDT

The packages are exported as internal since the APIs are not yet carved in stone (changes are possible). We will make them public as soon as we are satisfied with the solution.

Comment 5 Kai Kreuzer

2011-09-29 16:48:13 EDT

Ok, thanks for the clarification!

Comment 6 Karsten Thoms

2017-09-19 17:42:43 EDT

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

Comment 7 Karsten Thoms

2017-09-19 17:53:50 EDT

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