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Bug 312220

Summary:	[Xtext] Serialization raises NPE when processing rule with hidden terminal rules
Product:	[Modeling] TMF	Reporter:	Johan Wannheden <johan.wannheden>
Component:	Xtext	Assignee:	Project Inbox <tmf.xtext-inbox>
Status:	CLOSED FIXED	QA Contact:
Severity:	critical
Priority:	P3	CC:	moritz.eysholdt, sebastian.zarnekow
Version:	0.7.0	Flags:	sebastian.zarnekow: helios+
Target Milestone:	RC1
Hardware:	PC
OS:	Mac OS X - Carbon (unsup.)
Whiteboard:

Description Johan Wannheden

2010-05-10 04:48:20 EDT

Build Identifier: 20100218-1602

The following grammar with rule for root object contains a rule defining the header of a model instance. No terminal rules are hidden and thus WS is explicitly given, a model instance must contain the exact text "[mydsl 1.0]" with arbitrary numbers.

MyDsl :
    header=MyDslHeader
    'mydls' name=ID
    ...
;

MyDslHeader hidden() : 
    '[' 'mydsl' WS majorVersion=INT '.' minorVersion=INT ']'
;

When serializing a model instance (using Xtext 1.0.0 M7) an NPE is raised in

org.eclipse.xtext.validation.impl.ConcreteSyntaxConstraintProvider.createElement

on line 336 because "ele" is null.

Reproducible: Always

Comment 1 Moritz Eysholdt

2010-05-10 05:02:15 EDT

I'll take a look at this shortly.

Comment 2 Moritz Eysholdt

2010-05-10 08:10:30 EDT

This is actually the ConcreteSyntaxConstraintProvider having trouble to digest unassigned rule calls.

Comment 3 Moritz Eysholdt

2010-05-10 08:20:33 EDT

Fixed in HEAD.

Comment 4 Karsten Thoms

2017-09-19 16:13:45 EDT

Closing bug which were set to RESOLVED before Eclipse Neon.0.