| Re: [henshin-user] Error processing attribute update |
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 -- Prof. Dr. Matthias Tichy Institute of Software Engineering and Compiler Construction Faculty of Engineering, Computer Science and Psychology University of Ulm 89069 Ulm, Germany Tel.: +49 731 50-24160 Fax: +49 731 50-24162 email: matthias.tichy@xxxxxxxxxx
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