The documentation and program both suggest to add
- com.google -> gwt-user 2.3.0
- com.google -> gwt-dev 2.3.0
to dependencies.yml. The artifact group is incorrect, it should be
- com.google.gwt -> gwt-user 2.3.0
- com.google.gwt -> gwt-dev 2.3.0
Thanks and happy holidays!