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Serialization error: contains non-transient values but has no corresponding assignment in rule [message #1737874]

Wed, 13 July 2016 16:34

Ernesto Posse

Messages: 438
Registered: March 2011

Senior Member

Hello. I have an Xtext grammar for an existing EMF model and I'm attempting to serialize models, but I get errors such as the following:

org.eclipse.e4.core.di.InjectionException: org.eclipse.xtext.validation.IConcreteSyntaxValidator$InvalidConcreteSyntaxException: These errors need to be fixed before the model can be serialized.
RTModel'PingPong'.entities[0]->Capsule'Top'.parts[0]->CapsulePart'pinger': The feature MultiplicityElement(CapsulePart).unique contains non-transient values but has no corresponding assignment in rule CapsulePart.

Is this sort of error a problem with the model I'm trying to serialize or with the grammar itself?

The rule for this model element is this:

CapsulePart returns CapsulePart:
    (kind=CapsuleKind)?
    'part'
    name=EString
    ':' type=[Capsule|QualifiedName]
    ('[' upperBound=Bound ']')?
    RedefinitionFragment
    ';'
;

where "CapsulePart" is a (meta)class in the EMF (meta)model, which has:
* a 'type' reference of type 'Capsule'
* a 'kind' attribute of type 'CapsuleKind'
* supertypes MultiplicityElement and 'RedifinableElement'

and inherits from 'MultiplicityElement':
* a 'unique' attribute of type EBoolean
* an 'ordered' attribute of type EBoolean
* a 'lowerBound' attribute of type EString
* an 'upperBound' attribute of type EString

and inherits from RedefinableElement
* a 'name' attribute of type EString
* a 'redefines' reference of type RedefinableElement

Is the error caused by the fact that the grammar rule doesn't have assignments for attributes like 'unique', 'ordered', etc.?

If so, is there a way to assign default values to features? or alternatively a way to tell the serializer to ignore unassigned features?

Thanks

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Re: Serialization error: contains non-transient values but has no corresponding assignment in rule [message #1737885 is a reply to message #1737874]

Wed, 13 July 2016 18:47

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

The Problem is.

Your Model has an attribute with a value but no place in the grammar where
to serialize it. You can customize itransientvalueservice to tell xtext
that this Is ok

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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