Build fails with maven (gradle builds succesfully)

[swalton00]

using Java 8 on Windows, a new generated Griffon environment (groovy, swing) fails to compile with errors on the generated Model, View and Controller stating that each does not extend the related file for which it is the artifact provider for

[ERROR] D:\Projects\Griffon_Sample\Griffon_Source\griffMvn\griffon-app\controllers\com\spw\test\GriffonController.groovy: 9: does not extend com.spw.test.GriffonController
[ERROR] @ line 9, column 1.
[ERROR] @ArtifactProviderFor(GriffonController)
[ERROR] ^
[ERROR]
[ERROR] D:\Projects\Griffon_Sample\Griffon_Source\griffMvn\griffon-app\models\com\spw\test\GriffonModel.groovy: 7: does not extend com.spw.test.GriffonModel
[ERROR] @ line 7, column 1.
[ERROR] @ArtifactProviderFor(GriffonModel)
[ERROR] ^
[ERROR]
[ERROR] D:\Projects\Griffon_Sample\Griffon_Source\griffMvn\griffon-app\views\com\spw\test\GriffonView.groovy: 9: does not extend com.spw.test.GriffonView
[ERROR] @ line 9, column 1.
[ERROR] @ArtifactProviderFor(GriffonView)
[ERROR] ^
[ERROR]
[ERROR] 3 errors