Geomajas Community Documentation
The setup in IntelliJ IDEA is quite straightforward and does not require running a separate maven command. Make sure you use the maven import wizard to open your project, it can be activated from the File menu "Open project" and selectthe root pom.xml file.
Developing with the GWT face will require you to install the latest version of IntelliJ IDEA (9.0) as this is the only version that supports GWT 2.0. The IDE will recognize the GWT projects and assign the correct facet but as always you will have to make your own run configuration (which is fortunately trivial).
Depending on the actual IDEA version, some additional settings have to be done in the project structure dialog. Apart from specifying the GWT installation directory, there is a specific project setting which has to be done manually, which is setting the target Web facet to "Web". The project structure for the simple GWT project should look as follows:
After this, you should be able to run and debug the project. Note that this setting is needed for each of the GWT modules you want to be able to run.