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Home » Modeling » M2T (model-to-text transformation) » NullPointerException(Getting an exception after upgrading to Acceleo 3.3.1)
NullPointerException [message #1003670] Mon, 21 January 2013 18:41 Go to next message
Jon Buck is currently offline Jon BuckFriend
Messages: 29
Registered: July 2009
Junior Member
I have been trying to upgrade our projects to Acceleo 3.3.1 today and am trying to work out why I am now getting a NullPointerException during generation..

Debugging the code the exception occurs on line 565 within the AcceleoService class where it is trying to determine if the type of the parameter is a proxy object and it errors here as the type on the parameter is null as for some reason that value does not get set during the loading of the emtl file however it is hard to tell from looking at the object to tell what has been read/loaded...

Looking at the emtl that has been generated the type set in the script is correct and again debugging through the code I can see that the ResourceSet does have access to all of my metamodels and that the script is loaded...

I am not an expert on this subject so really need some pointers as to why I may be seeing the above exception...

Happy to provide more information if required...

All Help Appreciated.
Re: NullPointerException [message #1005908 is a reply to message #1003670] Tue, 29 January 2013 09:34 Go to previous message
Stephane Begaudeau is currently offline Stephane BegaudeauFriend
Messages: 458
Registered: April 2010
Location: Nantes (France)
Senior Member


the type on the parameter is null as for some reason

From the description of your problem, it seems that Acceleo cannot find the metamodel used by the generator. Does your metametamodel is in your workspace or in a plugin? Is it in a dependency of your Acceleo project? Does the error disappear if you realize a clean build of your workspace? (Project -> Clean)


Stephane Begaudeau, Obeo

Twitter: @sbegaudeau
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