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HELP! java.lang.NullPointerException when editing .model [message #1062358]

Fri, 07 June 2013 11:58

Julian Johnson

Messages: 20
Registered: March 2013

Junior Member

I've created a simple metamodel, via
• New -> Other > Empty EMF project ('crews')
• The right click on project, and New > ecore diagram;
Then saved, and registered metamodel, confirmed it has registered with Registry browser.
Then did
• New -> Other -> Epsilon > EMF Model
...associated this with the same metamodel, and then editing the model with exeed. At first I was able to add instances fine. After a couple of cycles of repeating the above, typically deleting the model before creating a new one against the modified metamodel, I now find I am getting a java.lang.NullPointerException when trying to add a particular instances of a class in the model. Attached are:

-screen dump of error
-metamodel .ecore
-metamodel diagram

The error is occuring when I try to create an instance of task. I can create instances of zone and equipment OK.

Help!

Attachment: crews1.model
(Size: 0.14KB, Downloaded 277 times)
Attachment: crews.ecore
(Size: 2.34KB, Downloaded 270 times)
Attachment: crews.ecorediag
(Size: 17.10KB, Downloaded 259 times)
Attachment: screen capture.jpg
(Size: 120.32KB, Downloaded 213 times)

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Re: HELP! java.lang.NullPointerException when editing .model [message #1062410 is a reply to message #1062358]

Fri, 07 June 2013 14:38

Antonio Garcia-Dominguez

Messages: 594
Registered: January 2010
Location: Birmingham, UK

Senior Member

Could you provide us with a stack trace of the NullPointerException? That'd be a big help Smile

.

Also, which class do we need to try adding to your model to produce the NPE?

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Re: HELP! java.lang.NullPointerException when editing .model [message #1062445 is a reply to message #1062410]

Fri, 07 June 2013 18:02

Dimitris Kolovos

Messages: 2163
Registered: July 2009
Location: York, UK

Senior Member

Hi Julian,

There appear to be some issues with crews.ecore. Please open crews.ecore using the the "Sample Ecore Model Editor", right-click on the root of the tree and select "Validate". This will pop up a dialog with a few problems; fixing these should make the NPE disappear.

Thanks,
Dimitris

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