code: public void clearGeometries() throws GeometryMergeException {
  		if (!busy) {
  			throw new GeometryMergeException("Can't clear geometry list if no merging process is active.");
  		}
  		for (Geometry geometry : geometries) {
  			eventBus.fireEvent(new GeometryMergeRemovedEvent(geometry));
  		}
  		geometries.clear();
  	}
docs: Clear the entire list of geometries for merging, basically resetting the process.
  
  @throws GeometryMergeException In case the merging process has not been started.