Today I stumbled over an issue that was unsolved in my workspace for some days now. Finally I got the time to fix it. I have a ECore meta-model which consists of three sub-packages and has no class in the main package. Generating model, edit and editor for this I had a nice start for my task. Then I wanted to generate code from this meta model and ran into a strange problem. On the console I simply got the following message when I tried to launch the Acceleo UI generator action:
The type of the first parameter of the main template named 'generateElement' is a proxy.
Due to some strange behaviour Acceleo was not able to read the meta-model definition when loading its templates, although the model itself was loaded fine. Trying to re-produce the issue with a new meta-model, everything seemed to work fine until I noticed the difference between my test model and the real model. The test model did have a class in the main package of the meta-model, while the real model did not. So the real model was like:
model -> sub1 -> class1 -> class2 -> sub2 -> class1 -> class2
while the test model was:
model -> class1 -> sub1 -> class1
Adding a dummy class to my main package and re-generating all files (including new plugin.xml files) solved the issue with Acceleo. Although I am still not sure where the problem actually lies. It is not in the Eclipse Bugzilla: https://bugs.eclipse.org/bugs/show_bug.cgi?id=401075