> So, if Maven is being used for building the project, this directory is required. We are in the same situation - we would like to have the benefits of the Groovy plugin when in Eclipse, but at the same time we need a working command-line build. Preferably, there should exist a project structure (or documented workflow) that can accommodate both. What could be done, I suppose, is for the Groovy builder (or some component of it) to be made available as a library that GMaven could use.
These two FAQ items of the m2eclipse plugin will be interesting for you: