code: public static FeatureColumn createGeometryColumn(int index, String name,
  			GeometryType type, boolean notNull, Object defaultValue) {
  		if (type == null) {
  			throw new GeoPackageException(
  					"Geometry Type is required to create geometry column: "
  							+ name);
  		}
  		return new FeatureColumn(index, name, GeoPackageDataType.BLOB, null,
  				notNull, defaultValue, false, type);
  	}
docs: Create a new geometry column
  
  @param index
  index
  @param name
  name
  @param type
  geometry type
  @param notNull
  not null flag
  @param defaultValue
  default value
  @return feature column