Bug 333804

Description Matthias Basler 2011-01-08 17:38:45 EST

Build Identifier: I20101216-1305

On Eclipse 4.1M4b:

I have created a small ecore model using the ecore diagram editor. The diagram consists of two packages having two classes each and a few references, so it is rather small. Nothing other has been changed or added.

Trying to get the EAttributes right, I wanted to delete some attributes. This produces three different outcomes:
a) Another attribute (not the selected one) was removed.
b) A dialog simply telling me "null".
c) A dialog showing the following error:

org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.NullPointerException)
Failed to execute runnable (java.lang.NullPointerException)

Afterwards the model editor is blank and the user has to discard the changes and re-open the model in the editor.

I give it P3 only because experienced on Eclipse 4.1M4b. If the problem occurred on a stable Eclipse 3.x release as well, it should be P2 imho. 
Eclipse Build: I20101216-1305
EMF SDK Build: 2.7.0.v20101215-0940
EcoreTools Build: 0.10.0.v20100615-1639

Reproducible: Always

Steps to Reproduce:
1. Create an "Empty EMF Project"
2. Add a New -> Ecore diagram
3. Add an Eclass
4. Add two attributes: Attrib1 and Attrib2 below it.
5. Select Attrib2 and in the context menu: "Delete from model"
 -> Attrib 1 is deleted
6. Select the remaining Attrib2 and choose "Delete from model"
 -> Error message "null". Attribute is not deleted.
7. Click on the EClass
8. Click on the EAttribute Attrib2 again and choose "Delete from model"
 -> Error message "NullPointerException"