Returns the list of root paths used by this service. In case the resource cannot be resolved directly, the
service will consecutively prepend each root path before the resource location in order to find an existing
resource. Example root paths are 'classpath:/org/geomajas' or 'file:C:/' or 'WEB-INF/images'.
Specifies the list of root paths to be used by this service. In case the resource cannot be resolved directly,
the service will consecutively prepend each root path before the resource location in order to find an existing
resource. Example root paths are 'classpath:/org/geomajas' or 'file:C:/' or 'WEB-INF/images'.