| Re: [henshin-dev] Henshin Search Pattern Problem |
hi,
I again have a little problem with the Henshin transformation engine. I constructed a search pattern which leads the engine to a NullPointerException. I could track down the error to its cause but I am not really sure why this happens. I attached a picture describing the Search pattern (Rule reconstruct) which causes the error and I also attached a full example project causing this error. Any help is really appreciated and I would be happy to hear something from anyone about this.
I just did some debugging.The problem is related to the automatic generation of Path constraints when required nodes (=PACs) are used. This automatic generation of path constraints is a performance improvement. It seems that your rule has the specific case that there is an edge between a required node in the PAC of the multi rule and a preserve node in the kernel rule.
@Christian: In Path.java:104, mappings are searched for the source of the edge but there exists no mapping because it is a PAC. This seems to be a bug. is it?
As a workaround, i changed in your henshin-rule the required node to a normal preserve node and then your example was executed.
Greetings to Stuttgart, 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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