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Hi,
my guess would be the same as the one by Matthias.
These kind of errors, related to parameter use, seem to occur
frequently. Recently, we discussed an error related to parameter
names conflicting with certain Java keywords (such as "new"). The
error message in this case was cryptic as well and, in addition,
only occurred at runtime.
I think we could detect such errors statically to show meaningful
error messages right during editing. Would you all agree that it
makes sense to add a check for correct parameter use (all
parameters are defined, no keywords used as names) in the
validator class?
Regards,
Daniel
Am 11.03.2016 um 16:22 schrieb Matthias Tichy:
hi,
I haven't used Henshin much before, so
this may well be a simple
beginner's error. Unfortunately, the error message I am provided
with
isn't awfully helpful and I couldn't figure out what's going on.
I have created a simple transformation using the Henshin diagram
editor.
This moves one object from one place to another and updates some
attributes. To express attribute updates, I have used the ->
notation as
shown in the Bank tutorial. So, one of the attributes reads
"spaceRemaining=x->x+a.spaceRequired*a.quantity" where "a"
refers to a
different node in my rule, which has the attributes mentioned.
> When I run this rule on a model, it is matched (as I would
expect), but
> I get the following error:
>> java.lang.RuntimeException: ReferenceError: "x" is not
defined in
>> <eval> at line number 1
>> at
>>
org.eclipse.emf.henshin.interpreter.impl.EngineImpl.evalAttributeExpression(EngineImpl.java:946)
>>
please add screenshots in the future, this helps to pinpoint
problems.
My assumption based on your description is that you do not have
added x as a parameter to the rule.
See the bank example (Rule transferMoney)
https://www.eclipse.org/henshin/examples.php?example=bank
Cheers,
Matthias
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--
Dr. rer. nat. Daniel Strüber, Dipl.-Inf.
Software Engineering Research Group
Philipps-Universität Marburg, Germany
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