Description Joern E. 2010-08-26 14:27:32 EDT

Build Identifier: 20100617-1415

Using OCLinEcore to define derived attributes a NPE is thrown for every access of an (normal) attribute given the following model:

import ecore : 'http://www.eclipse.org/emf/2002/Ecore#/';

package my : my = 'http://my/1.0'
{
	class Model
	{
		property bs : BType[*] { composes };
	}
	class Entity
	{
		attribute name : String[?];
	}
	class AType extends Entity
	{
		operation referenced() : BType[?] 
		{
			body: BType.allInstances()->select(references->includes(self))->asSequence()->first();
		}
		attribute referencedAttr : BType[?] { derived,volatile,transient,readonly }
		{
			derivation: BType.allInstances()->select(references->includes(self))->asSequence()->first();
		}

	}
	class BType extends Entity
	{
		property references : AType[*] { composes };
	}
}

Reproducible: Always

Steps to Reproduce:
1. Copy and paste model in an empty EMF project/file called My.ecore
2. Generate dynamic instance from "Model" in the outline (right click, "Model.xmi")
3. Add "BType" as child
4. Add "AType" as child
5. Change property "name" to "a1" -> NPE
6. Close "Model.xmi"
7. Remove derived attribute from the model
8. Open "Model.xmi" and repeat from 4. -> no NPE