code: private static FeatureCoreStyleExtension getFeatureStyleExtension(
  			GeoPackageCore geoPackage) {
  
  		RelatedTablesCoreExtension relatedTables = new RelatedTablesCoreExtension(
  				geoPackage) {
  			@Override
  			public String getPrimaryKeyColumnName(String tableName) {
  				return null;
  			}
  		};
  
  		return new FeatureCoreStyleExtension(geoPackage, relatedTables) {
  		};
  	}
docs: Get a Feature Style Extension used only for deletions
  
  @param geoPackage
  GeoPackage
  @return Feature Style Extension