code: public void remove(Class<?> clazz) {
  		ClassMetadata metadata = get(clazz);
  		metadataByClass.remove(clazz);
  		metadataByKind.remove(metadata.getKind());
  	}
docs: Removes a persistent class from the repository
  @param clazz the persistent class to remove
  @throws IllegalArgumentException if the class is not present in the repository